lldb> bt all
thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d1bf280, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d1bf280) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d1bf280) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a49db01 memcached`memcached_main(argc=0, argv=0x0000000000000000) at memcached.cc:1043:20 [opt]
 frame #7: 0x00000001122f852e dyld`start + 462

thread #2
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a9ef5a5 memcached`spdlog::details::mpmc_blocking_queue<spdlog::details::async_msg>::dequeue_for(spdlog::details::async_msg&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x000000010d15a798, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010a9ef549 memcached`spdlog::details::mpmc_blocking_queue<spdlog::details::async_msg>::dequeue_for(spdlog::details::async_msg&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x000000010d15a798, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010a9ef544 memcached`spdlog::details::mpmc_blocking_queue<spdlog::details::async_msg>::dequeue_for(spdlog::details::async_msg&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >, spdlog::details::mpmc_blocking_queue<spdlog::details::async_msg>::dequeue_for(spdlog::details::async_msg&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >)::'lambda'()>(this=0x000000010d15a7d8, __lk=<unavailable>, __t=<unavailable>, __pred=<unavailable>)::'lambda'()) at __mutex_base:396 [opt]
 frame #6: 0x000000010a9ef528 memcached`spdlog::details::mpmc_blocking_queue<spdlog::details::async_msg>::dequeue_for(spdlog::details::async_msg&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000l>, spdlog::details::mpmc_blocking_queue<spdlog::details::async_msg>::dequeue_for(spdlog::details::async_msg&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >)::'lambda'()>(this=0x000000010d15a7d8, __lk=<unavailable>, __d=<unavailable>, __pred=<unavailable>)::'lambda'()) at __mutex_base:430 [opt]
 frame #7: 0x000000010a9ef50c memcached`spdlog::details::mpmc_blocking_queue<spdlog::details::async_msg>::dequeue_for(this=0x000000010d15a798, popped_item=0x0000700004621dc0, wait_duration=<unavailable>) at mpmc_blocking_q.h:58 [opt]
 frame #8: 0x000000010a9ef3e1 memcached`spdlog::details::thread_pool::process_next_msg_(this=<unavailable>) at thread_pool-inl.h:99:24 [opt]
 frame #9: 0x000000010a9effc8 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::thread_pool::thread_pool(unsigned long, unsigned long, std::__1::function<void ()>)::$_1> >(void*) [inlined] spdlog::details::thread_pool::worker_loop_(this=<unavailable>) at thread_pool-inl.h:90:12 [opt]
 frame #10: 0x000000010a9effb7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::thread_pool::thread_pool(unsigned long, unsigned long, std::__1::function<void ()>)::$_1> >(void*) [inlined] spdlog::details::thread_pool::thread_pool(this=<unavailable>)>)::$_1::operator()() const at thread_pool-inl.h:28 [opt]
 frame #11: 0x000000010a9effa4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::thread_pool::thread_pool(unsigned long, unsigned long, std::__1::function<void ()>)::$_1> >(void*) [inlined] decltype(__f=<unavailable>)>)::$_1>(fp)()) std::__1::__invoke<spdlog::details::thread_pool::thread_pool(unsigned long, unsigned long, std::__1::function<void ()>)::$_1>(spdlog::details::thread_pool::thread_pool(unsigned long, unsigned long, std::__1::function<void ()>)::$_1&&) at type_traits:4361 [opt]
 frame #12: 0x000000010a9effa4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::thread_pool::thread_pool(unsigned long, unsigned long, std::__1::function<void ()>)::$_1> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::thread_pool::thread_pool(unsigned long, unsigned long, std::__1::function<void ()>)::$_1>(__t=<unavailable>, (null)=<unavailable>)>)::$_1>&, std::__1::__tuple_indices<>) at thread:342 [opt]
 frame #13: 0x000000010a9effa4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::thread_pool::thread_pool(unsigned long, unsigned long, std::__1::function<void ()>)::$_1> >(__vp=0x000000010d148630) at thread:352 [opt]
 frame #14: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #15: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #3
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a9efc65 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0> >(void*) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x000000010b7bd990, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010a9efbff memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0> >(void*) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x000000010b7bd990, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010a9efbfa memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0> >(void*) [inlined] bool std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0::operator()() const::'lambda'()>(this=<unavailable>, __lk=0x000000010b7bd990, __t=<unavailable>, __pred=<unavailable>)> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0::operator()() const::'lambda'()) at __mutex_base:396 [opt]
 frame #6: 0x000000010a9efbe1 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0> >(void*) [inlined] bool std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1l>, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0::operator()() const::'lambda'()>(this=<unavailable>, __lk=0x000000010b7bd990, __d=<unavailable>, __pred=<unavailable>)> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0::operator()() const::'lambda'()) at __mutex_base:430 [opt]
 frame #7: 0x000000010a9efbd1 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0> >(void*) at periodic_worker-inl.h:25 [opt]
 frame #8: 0x000000010a9efba3 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0> >(void*) [inlined] decltype(__f=<unavailable>)> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0>(fp)()) std::__1::__invoke<spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0>(spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0&&) at type_traits:4361 [opt]
 frame #9: 0x000000010a9efba3 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0>(__t=<unavailable>, (null)=<unavailable>)> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0>&, std::__1::__tuple_indices<>) at thread:342 [opt]
 frame #10: 0x000000010a9efba3 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, spdlog::details::periodic_worker::periodic_worker(std::__1::function<void ()> const&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1l> >)::$_0> >(__vp=<unavailable>) at thread:352 [opt]
 frame #11: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #12: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #4, name = 'mc:check_stdin'
 frame #0: 0x00007ff8174640aa libsystem_kernel.dylib`poll + 10
 frame #1: 0x000000010a443042 memcached`check_stdin_thread(void*) [inlined] get_command(buffer=" \U0000007fr\U00000004", buffsize=80) at stdin_check.cc:57:17 [opt]
 frame #2: 0x000000010a44300a memcached`check_stdin_thread(arg=<unavailable>) at stdin_check.cc:98:12 [opt]
 frame #3: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14c2d0) at cb_pthreads.cc:51:9 [opt]
 frame #4: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14c2d0) at cb_pthreads.cc:64:14 [opt]
 frame #5: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #6: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #5, name = 'mcd:ext_auth'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a4e535e memcached`ExternalAuthManagerThread::run() [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=0x000000010d1bf110, __lk=0x0000700004933f28, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010a4e52f7 memcached`ExternalAuthManagerThread::run(this=0x000000010d1bf000) at external_auth_manager_thread.cc:91:32 [opt]
 frame #5: 0x000000010aa1dde3 memcached`Couchbase::Thread::thread_entry(this=0x000000010d1bf000) at thread.cc:38:5 [opt]
 frame #6: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14c9c0) at cb_pthreads.cc:51:9 [opt]
 frame #7: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14c9c0) at cb_pthreads.cc:64:14 [opt]
 frame #8: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #9: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #6, name = 'mc:auditd'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a533525 memcached`AuditImpl::consume_events() [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1l> >(this=0x000000010d14fe20, __lk=0x00007000049b6f58, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010a5334fa memcached`AuditImpl::consume_events(this=0x000000010d14fa00) at audit.cc:414:28 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14cab0) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14cab0) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #7
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x000000010a9681eb memcached`worker_thread [inlined] consume_socket(ctx=<unavailable>, sp=0x00007fc8e4013100, thread_index=<unavailable>) at civetweb.c:18846:3 [opt]
 frame #3: 0x000000010a9681ce memcached`worker_thread [inlined] worker_thread_run(conn=0x00007fc8e4012810) at civetweb.c:18987 [opt]
 frame #4: 0x000000010a968156 memcached`worker_thread(thread_func_param=0x00007fc8e4012810) at civetweb.c:19145 [opt]
 frame #5: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #6: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #8
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x000000010a9681eb memcached`worker_thread [inlined] consume_socket(ctx=<unavailable>, sp=0x00007fc8e4013b00, thread_index=<unavailable>) at civetweb.c:18846:3 [opt]
 frame #3: 0x000000010a9681ce memcached`worker_thread [inlined] worker_thread_run(conn=0x00007fc8e4013210) at civetweb.c:18987 [opt]
 frame #4: 0x000000010a968156 memcached`worker_thread(thread_func_param=0x00007fc8e4013210) at civetweb.c:19145 [opt]
 frame #5: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #6: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #9
 frame #0: 0x00007ff8174640aa libsystem_kernel.dylib`poll + 10
 frame #1: 0x000000010a9686a4 memcached`master_thread [inlined] master_thread_run(ctx=0x00007fc8e400c410) at civetweb.c:19291:7 [opt]
 frame #2: 0x000000010a96852e memcached`master_thread(thread_func_param=0x00007fc8e400c410) at civetweb.c:19386 [opt]
 frame #3: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #4: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #10, name = 'mc:worker_00'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d70b010, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d70b010) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d70b010) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d70b000) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d650) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d650) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #11, name = 'mc:worker_01'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d70bc20, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d70bc20) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d70bc20) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d70bc10) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d680) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d680) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #12, name = 'mc:worker_02'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d70c830, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d70c830) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d70c830) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d70c820) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d6b0) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d6b0) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #13, name = 'mc:worker_03'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d70d440, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d70d440) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d70d440) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d70d430) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d6e0) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d6e0) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #14, name = 'mc:worker_04'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d70e050, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d70e050) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d70e050) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d70e040) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d710) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d710) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #15, name = 'mc:worker_05'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d70ec60, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d70ec60) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d70ec60) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d70ec50) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d740) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d740) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #16, name = 'mc:worker_06'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d70f870, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d70f870) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d70f870) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d70f860) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d770) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d770) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #17, name = 'mc:worker_07'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d710480, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d710480) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d710480) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d710470) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d7a0) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d7a0) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #18, name = 'mc:worker_08'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d711090, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d711090) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d711090) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d711080) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d7d0) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d7d0) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #19, name = 'mc:worker_09'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d711ca0, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d711ca0) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d711ca0) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010a420836 memcached`worker_libevent(arg=0x000000010d711c90) at thread.cc:257:18 [opt]
 frame #7: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d14d800) at cb_pthreads.cc:51:9 [opt]
 frame #8: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d14d800) at cb_pthreads.cc:64:14 [opt]
 frame #9: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #10: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #20, name = 'ReaderPool0'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700004f57b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700004f57b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700004f57b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700004f57b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a54bb6, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00048, deadline=0x0000700004f57cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x0000700004f57cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77f880 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bb40)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bb40)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b904e40)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b904e40)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b904e40)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b904e30) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #21, name = 'ReaderPool1'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700004fdab38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700004fdab38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700004fdab10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700004fdab08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a335a6787, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00120, deadline=0x0000700004fdacb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x0000700004fdacb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77fca0 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bbc0)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bbc0)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b904eb0)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b904eb0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b904eb0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b904ea0) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #22, name = 'ReaderPool2'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x000070000505db38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x000070000505db38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000070000505db10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x000070000505db08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a50740, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00030, deadline=0x000070000505dcb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x000070000505dcb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77fd00 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bc00)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bc00)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b904f20)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b904f20)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b904f20)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b904f10) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #23, name = 'ReaderPool3'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x00007000050e0b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x00007000050e0b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007000050e0b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x00007000050e0b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a53e37, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee001b0, deadline=0x00007000050e0cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x00007000050e0cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77fd60 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bc80)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bc80)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b904f90)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b904f90)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b904f90)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b904f80) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #24, name = 'ReaderPool4'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005163b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005163b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005163b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005163b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a4f88b, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee000a8, deadline=0x0000700005163cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x0000700005163cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77fdc0 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bcc0)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bcc0)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905000)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905000)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905000)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b904ff0) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #25, name = 'ReaderPool5'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x00007000051e6b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x00007000051e6b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007000051e6b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x00007000051e6b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a4f6ac, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00060, deadline=0x00007000051e6cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x00007000051e6cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77fe20 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bc40)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bc40)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905070)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905070)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905070)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905060) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #26, name = 'ReaderPool6'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005269b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005269b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005269b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005269b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a335a6dd9, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee000c0, deadline=0x0000700005269cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x0000700005269cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77fe80 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bd00)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bd00)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9050e0)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9050e0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9050e0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b9050d0) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #27, name = 'ReaderPool7'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x00007000052ecb38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x00007000052ecb38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007000052ecb10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x00007000052ecb08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a53d2a, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00078, deadline=0x00007000052eccb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x00007000052eccb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77fee0 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bd40)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bd40)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905150)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905150)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905150)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905140) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #28, name = 'ReaderPool8'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x000070000536fb38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x000070000536fb38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000070000536fb10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x000070000536fb08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b981886c9f58, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee000f0, deadline=0x000070000536fcb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x000070000536fcb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77ff40 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bdc0)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bdc0)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9051c0)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9051c0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9051c0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b9051b0) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #29, name = 'ReaderPool9'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x00007000053f2b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x00007000053f2b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007000053f2b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x00007000053f2b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a335a6c6a, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee000d8, deadline=0x00007000053f2cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x00007000053f2cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77ffa0 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bd80)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bd80)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905230)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905230)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905230)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905220) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #30, name = 'ReaderPool10'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005475b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005475b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005475b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005475b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97ba568a86a, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00108, deadline=0x0000700005475cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x0000700005475cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b780000 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17be00)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17be00)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9052a0)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9052a0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9052a0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905290) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #31, name = 'ReaderPool11'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x00007000054f8b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x00007000054f8b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007000054f8b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x00007000054f8b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a5526c, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00018, deadline=0x00007000054f8cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8c3704390, deadline=0x00007000054f8cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8c3704390, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8c3704380, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d7d00, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b780060 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17be40)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17be40)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905310)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905310)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905310)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905300) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #32, name = 'WriterPool0'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a87d433 memcached`magma::WALOffset::String() [inlined] std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_stringbuf(this=<unavailable>) at iosfwd:135:32 [opt]
 frame #4: 0x000000010a887c1e memcached`magma::WALOffset::String() [inlined] std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_stringbuf(this=<unavailable>) at iosfwd:135:32 [opt]
 frame #5: 0x000000010a890658 memcached`magma::WALOffset::String() [inlined] std::__1::basic_ios<char, std::__1::char_traits<char> >::init(this=<unavailable>, __sb=<unavailable>) at ios:700:15 [opt]
 frame #6: 0x000000010a896575 memcached`nlohmann::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> > >::at(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) [inlined] std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string<std::nullptr_t>(this=Summary Unavailable, __s=<unavailable>) - 18446744069237807754 [opt]
 frame #7: 0x000000010a8238ef memcached`magma::Magma::Impl::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=<unavailable>, kvsRev=1, docCallback=magma::Magma::WriteDocsCallback @ 0x000070000557ad70, postCallback=magma::Magma::PostWriteDocsCallback @ 0x000070000557ad20, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at db_write.cc:48:35 [opt]
 frame #8: 0x000000010a823c2e memcached`magma::Magma::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=size=1294, kvsRev=1, docCallback=<unavailable>, postCallback=magma::Magma::PostWriteDocsCallback @ 0x000070000557ade0, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at db_write.cc:62:18 [opt]
 frame #9: 0x000000010a582263 memcached`MagmaMemoryTrackingProxy::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=size=1294, kvsRev=1, docCallback=<unavailable>, postCallback=magma::Magma::PostWriteDocsCallback @ 0x000070000557af30, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at magma-memory-tracking-proxy.cc:510:19 [opt]
 frame #10: 0x000000010a5d22b9 memcached`MagmaKVStore::saveDocs(this=0x000000010d153b00, txnCtx=<unavailable>, commitData=<unavailable>, kvctx=0x000070000557b1b8, historyMode=Enabled) at magma-kvstore.cc:1569:26 [opt]
 frame #11: 0x000000010a5ce3f2 memcached`MagmaKVStore::commit(this=0x000000010d153b00, txnCtx=TransactionContext @ 0x0000000110df71f0, commitData=0x000070000557b660) at magma-kvstore.cc:775:20 [opt]
 frame #12: 0x000000010a6f5e49 memcached`EPBucket::commit(this=0x0000000110783000, kvstore=0x000000010d153b00, txnCtx=nullptr, commitData=<unavailable>) at ep_bucket.cc:970:30 [opt]
 frame #13: 0x000000010a6f4d85 memcached`EPBucket::flushVBucket_UNLOCKED(this=0x0000000110783000, vb=<unavailable>) at ep_bucket.cc:843:10 [opt]
 frame #14: 0x000000010a6f3bff memcached`EPBucket::flushVBucket(this=0x0000000110783000, vbid=<unavailable>) at ep_bucket.cc:383:12 [opt]
 frame #15: 0x000000010a6d0e94 memcached`Flusher::flushVB(this=0x0000000110e56800) at flusher.cc:293:29 [opt]
 frame #16: 0x000000010a6d0a47 memcached`Flusher::step(this=0x0000000110e56800, task=0x0000000110ef4538) at flusher.cc:203:21 [opt]
 frame #17: 0x000000010a9048bf memcached`GlobalTask::execute(this=0x0000000110ef4538, threadName="WriterPool0") at globaltask.cc:98:21 [opt]
 frame #18: 0x000000010a907e59 memcached`FollyExecutorPool::TaskProxy::scheduleViaCPUPool(this=0x000070000557bbb0)::'lambda0'()::operator()() const at folly_executorpool.cc:163:41 [opt]
 frame #19: 0x000000010a9112ec memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000070000557bbb0)() at Function.h:416:12 [opt]
 frame #20: 0x000000010a9112dc memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] CancellableCPUExecutor::add(this=<unavailable>)>)::$_0::operator()() const at cancellable_cpu_executor.cc:42:13 [opt]
 frame #21: 0x000000010a910edf memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(p=<unavailable>)>)::$_0>(folly::detail::function::Data&) at Function.h:387:7 [opt]
 frame #22: 0x000000010aa66e92 memcached`folly::ThreadPoolExecutor::runTask(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=<unavailable>)() at Function.h:416:12 [opt]
 frame #23: 0x000000010aa66e8c memcached`folly::ThreadPoolExecutor::runTask(this=<unavailable>, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b7800c0 strong=3 weak=1, task=0x000070000557be10) at ThreadPoolExecutor.cpp:97 [opt]
 frame #24: 0x000000010aa55ffe memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d8900, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b7800c0 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:265:5 [opt]
 frame #25: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #26: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #27: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #28: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #29: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bf00)() at Function.h:416:12 [opt]
 frame #30: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bf00)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #31: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b904dd0)() at Function.h:416:12 [opt]
 frame #32: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b904dd0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #33: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b904dd0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #34: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #35: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b904dc0) at thread:298:5 [opt]
 frame #36: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #37: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #33, name = 'WriterPool1'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a87d433 memcached`magma::WALOffset::String() [inlined] std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_stringbuf(this=<unavailable>) at iosfwd:135:32 [opt]
 frame #4: 0x000000010a887c1e memcached`magma::WALOffset::String() [inlined] std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_stringbuf(this=<unavailable>) at iosfwd:135:32 [opt]
 frame #5: 0x000000010a890658 memcached`magma::WALOffset::String() [inlined] std::__1::basic_ios<char, std::__1::char_traits<char> >::init(this=<unavailable>, __sb=<unavailable>) at ios:700:15 [opt]
 frame #6: 0x000000010a896575 memcached`nlohmann::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> > >::at(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) [inlined] std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string<std::nullptr_t>(this=Summary Unavailable, __s=<unavailable>) - 18446744069237807754 [opt]
 frame #7: 0x000000010a8238ef memcached`magma::Magma::Impl::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=<unavailable>, kvsRev=1, docCallback=magma::Magma::WriteDocsCallback @ 0x00007000055fdd70, postCallback=magma::Magma::PostWriteDocsCallback @ 0x00007000055fdd20, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at db_write.cc:48:35 [opt]
 frame #8: 0x000000010a823c2e memcached`magma::Magma::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=size=844, kvsRev=1, docCallback=<unavailable>, postCallback=magma::Magma::PostWriteDocsCallback @ 0x00007000055fdde0, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at db_write.cc:62:18 [opt]
 frame #9: 0x000000010a582263 memcached`MagmaMemoryTrackingProxy::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=size=844, kvsRev=1, docCallback=<unavailable>, postCallback=magma::Magma::PostWriteDocsCallback @ 0x00007000055fdf30, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at magma-memory-tracking-proxy.cc:510:19 [opt]
 frame #10: 0x000000010a5d22b9 memcached`MagmaKVStore::saveDocs(this=0x0000000110c0d400, txnCtx=<unavailable>, commitData=<unavailable>, kvctx=0x00007000055fe1b8, historyMode=Enabled) at magma-kvstore.cc:1569:26 [opt]
 frame #11: 0x000000010a5ce3f2 memcached`MagmaKVStore::commit(this=0x0000000110c0d400, txnCtx=TransactionContext @ 0x0000000110df31e0, commitData=0x00007000055fe660) at magma-kvstore.cc:775:20 [opt]
 frame #12: 0x000000010a6f5e49 memcached`EPBucket::commit(this=0x0000000110783000, kvstore=0x0000000110c0d400, txnCtx=nullptr, commitData=<unavailable>) at ep_bucket.cc:970:30 [opt]
 frame #13: 0x000000010a6f4d85 memcached`EPBucket::flushVBucket_UNLOCKED(this=0x0000000110783000, vb=<unavailable>) at ep_bucket.cc:843:10 [opt]
 frame #14: 0x000000010a6f3bff memcached`EPBucket::flushVBucket(this=0x0000000110783000, vbid=<unavailable>) at ep_bucket.cc:383:12 [opt]
 frame #15: 0x000000010a6d0e94 memcached`Flusher::flushVB(this=0x0000000110e5a000) at flusher.cc:293:29 [opt]
 frame #16: 0x000000010a6d0a47 memcached`Flusher::step(this=0x0000000110e5a000, task=0x0000000110f95bf8) at flusher.cc:203:21 [opt]
 frame #17: 0x000000010a9048bf memcached`GlobalTask::execute(this=0x0000000110f95bf8, threadName="WriterPool1") at globaltask.cc:98:21 [opt]
 frame #18: 0x000000010a907e59 memcached`FollyExecutorPool::TaskProxy::scheduleViaCPUPool(this=0x00007000055febb0)::'lambda0'()::operator()() const at folly_executorpool.cc:163:41 [opt]
 frame #19: 0x000000010a9112ec memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x00007000055febb0)() at Function.h:416:12 [opt]
 frame #20: 0x000000010a9112dc memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] CancellableCPUExecutor::add(this=<unavailable>)>)::$_0::operator()() const at cancellable_cpu_executor.cc:42:13 [opt]
 frame #21: 0x000000010a910edf memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(p=<unavailable>)>)::$_0>(folly::detail::function::Data&) at Function.h:387:7 [opt]
 frame #22: 0x000000010aa66e92 memcached`folly::ThreadPoolExecutor::runTask(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=<unavailable>)() at Function.h:416:12 [opt]
 frame #23: 0x000000010aa66e8c memcached`folly::ThreadPoolExecutor::runTask(this=<unavailable>, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b780120 strong=3 weak=1, task=0x00007000055fee10) at ThreadPoolExecutor.cpp:97 [opt]
 frame #24: 0x000000010aa55ffe memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d8900, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b780120 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:265:5 [opt]
 frame #25: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #26: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #27: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #28: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #29: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bf40)() at Function.h:416:12 [opt]
 frame #30: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bf40)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #31: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905380)() at Function.h:416:12 [opt]
 frame #32: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905380)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #33: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905380)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #34: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #35: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905370) at thread:298:5 [opt]
 frame #36: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #37: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #34, name = 'WriterPool2'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a87d433 memcached`magma::WALOffset::String() [inlined] std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_stringbuf(this=<unavailable>) at iosfwd:135:32 [opt]
 frame #4: 0x000000010a887c1e memcached`magma::WALOffset::String() [inlined] std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_stringbuf(this=<unavailable>) at iosfwd:135:32 [opt]
 frame #5: 0x000000010a890658 memcached`magma::WALOffset::String() [inlined] std::__1::basic_ios<char, std::__1::char_traits<char> >::init(this=<unavailable>, __sb=<unavailable>) at ios:700:15 [opt]
 frame #6: 0x000000010a896575 memcached`nlohmann::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> > >::at(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) [inlined] std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string<std::nullptr_t>(this=Summary Unavailable, __s=<unavailable>) - 18446744069237807754 [opt]
 frame #7: 0x000000010a8238ef memcached`magma::Magma::Impl::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=<unavailable>, kvsRev=1, docCallback=magma::Magma::WriteDocsCallback @ 0x0000700005680d70, postCallback=magma::Magma::PostWriteDocsCallback @ 0x0000700005680d20, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at db_write.cc:48:35 [opt]
 frame #8: 0x000000010a823c2e memcached`magma::Magma::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=size=927, kvsRev=1, docCallback=<unavailable>, postCallback=magma::Magma::PostWriteDocsCallback @ 0x0000700005680de0, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at db_write.cc:62:18 [opt]
 frame #9: 0x000000010a582263 memcached`MagmaMemoryTrackingProxy::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=size=927, kvsRev=1, docCallback=<unavailable>, postCallback=magma::Magma::PostWriteDocsCallback @ 0x0000700005680f30, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at magma-memory-tracking-proxy.cc:510:19 [opt]
 frame #10: 0x000000010a5d22b9 memcached`MagmaKVStore::saveDocs(this=0x0000000110c0cf00, txnCtx=<unavailable>, commitData=<unavailable>, kvctx=0x00007000056811b8, historyMode=Enabled) at magma-kvstore.cc:1569:26 [opt]
 frame #11: 0x000000010a5ce3f2 memcached`MagmaKVStore::commit(this=0x0000000110c0cf00, txnCtx=TransactionContext @ 0x000000012796d070, commitData=0x0000700005681660) at magma-kvstore.cc:775:20 [opt]
 frame #12: 0x000000010a6f5e49 memcached`EPBucket::commit(this=0x0000000110783000, kvstore=0x0000000110c0cf00, txnCtx=nullptr, commitData=<unavailable>) at ep_bucket.cc:970:30 [opt]
 frame #13: 0x000000010a6f4d85 memcached`EPBucket::flushVBucket_UNLOCKED(this=0x0000000110783000, vb=<unavailable>) at ep_bucket.cc:843:10 [opt]
 frame #14: 0x000000010a6f3bff memcached`EPBucket::flushVBucket(this=0x0000000110783000, vbid=<unavailable>) at ep_bucket.cc:383:12 [opt]
 frame #15: 0x000000010a6d0e94 memcached`Flusher::flushVB(this=0x0000000110e59800) at flusher.cc:293:29 [opt]
 frame #16: 0x000000010a6d0a47 memcached`Flusher::step(this=0x0000000110e59800, task=0x0000000110ef4ad8) at flusher.cc:203:21 [opt]
 frame #17: 0x000000010a9048bf memcached`GlobalTask::execute(this=0x0000000110ef4ad8, threadName="WriterPool2") at globaltask.cc:98:21 [opt]
 frame #18: 0x000000010a907e59 memcached`FollyExecutorPool::TaskProxy::scheduleViaCPUPool(this=0x0000700005681bb0)::'lambda0'()::operator()() const at folly_executorpool.cc:163:41 [opt]
 frame #19: 0x000000010a9112ec memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x0000700005681bb0)() at Function.h:416:12 [opt]
 frame #20: 0x000000010a9112dc memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] CancellableCPUExecutor::add(this=<unavailable>)>)::$_0::operator()() const at cancellable_cpu_executor.cc:42:13 [opt]
 frame #21: 0x000000010a910edf memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(p=<unavailable>)>)::$_0>(folly::detail::function::Data&) at Function.h:387:7 [opt]
 frame #22: 0x000000010aa66e92 memcached`folly::ThreadPoolExecutor::runTask(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=<unavailable>)() at Function.h:416:12 [opt]
 frame #23: 0x000000010aa66e8c memcached`folly::ThreadPoolExecutor::runTask(this=<unavailable>, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b780180 strong=3 weak=1, task=0x0000700005681e10) at ThreadPoolExecutor.cpp:97 [opt]
 frame #24: 0x000000010aa55ffe memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d8900, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b780180 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:265:5 [opt]
 frame #25: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #26: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #27: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #28: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #29: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17bf80)() at Function.h:416:12 [opt]
 frame #30: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17bf80)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #31: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9053f0)() at Function.h:416:12 [opt]
 frame #32: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9053f0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #33: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9053f0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #34: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #35: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b9053e0) at thread:298:5 [opt]
 frame #36: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #37: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #35, name = 'WriterPool3'
 frame #0: 0x000000010a84c83b memcached`magma::TreeSnapshot::ActiveTable::GetState(this=<unavailable>) const at tree_snapshot.cc:619:19 [opt]
 frame #1: 0x000000010a83e459 memcached`magma::LSMTree::computeCompactionInputs(this=0x00000001115b3820, level=0, trigger=<unavailable>, dstLevel=0x00007000057036a0, srcTablesList=0x0000700005703660 size=6, dstTablesList=0x0000700005703680 size=0) at compaction.cc:721:24 [opt]
 frame #2: 0x000000010a83bbd5 memcached`magma::LSMTree::compactLevel(this=0x00000001115b3820, level=0, lock=0x0000700005703858, trigger=(Ratio = 0, Reason = External), makeGCContext=magma::GCContextBuilder @ 0x0000700005703730)>) at compaction.cc:83:14 [opt]
 frame #3: 0x000000010a83b9b6 memcached`magma::LSMTree::tryCompactOnWrite(this=0x00000001115b3820, lock=0x0000700005703858) at compaction.cc:33:19 [opt]
 frame #4: 0x000000010a87d33d memcached`magma::WALOffset::String() [inlined] std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(__os=<unavailable>, __str=<unavailable>) at ostream:857:12 [opt]
 frame #5: 0x000000010a887c1e memcached`magma::WALOffset::String() [inlined] std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_stringbuf(this=<unavailable>) at iosfwd:135:32 [opt]
 frame #6: 0x000000010a890658 memcached`magma::WALOffset::String() [inlined] std::__1::basic_ios<char, std::__1::char_traits<char> >::init(this=<unavailable>, __sb=<unavailable>) at ios:700:15 [opt]
 frame #7: 0x000000010a896575 memcached`nlohmann::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> > >::at(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) [inlined] std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string<std::nullptr_t>(this=Summary Unavailable, __s=<unavailable>) - 18446744069237807754 [opt]
 frame #8: 0x000000010a8238ef memcached`magma::Magma::Impl::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=<unavailable>, kvsRev=1, docCallback=magma::Magma::WriteDocsCallback @ 0x0000700005703d70, postCallback=magma::Magma::PostWriteDocsCallback @ 0x0000700005703d20, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at db_write.cc:48:35 [opt]
 frame #9: 0x000000010a823c2e memcached`magma::Magma::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=size=1579, kvsRev=1, docCallback=<unavailable>, postCallback=magma::Magma::PostWriteDocsCallback @ 0x0000700005703de0, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at db_write.cc:62:18 [opt]
 frame #10: 0x000000010a582263 memcached`MagmaMemoryTrackingProxy::WriteDocs(this=<unavailable>, kvID=<unavailable>, docOperations=size=1579, kvsRev=1, docCallback=<unavailable>, postCallback=magma::Magma::PostWriteDocsCallback @ 0x0000700005703f30, historyMode=Enabled)>, std::__1::function<std::__1::pair<magma::Status, std::__1::vector<magma::Magma::WriteOperation, std::__1::allocator<magma::Magma::WriteOperation> > const*> ()>, magma::Magma::HistoryMode) at magma-memory-tracking-proxy.cc:510:19 [opt]
 frame #11: 0x000000010a5d22b9 memcached`MagmaKVStore::saveDocs(this=0x0000000110c0ca00, txnCtx=<unavailable>, commitData=<unavailable>, kvctx=0x00007000057041b8, historyMode=Enabled) at magma-kvstore.cc:1569:26 [opt]
 frame #12: 0x000000010a5ce3f2 memcached`MagmaKVStore::commit(this=0x0000000110c0ca00, txnCtx=TransactionContext @ 0x000000012124bdc0, commitData=0x0000700005704660) at magma-kvstore.cc:775:20 [opt]
 frame #13: 0x000000010a6f5e49 memcached`EPBucket::commit(this=0x0000000110783000, kvstore=0x0000000110c0ca00, txnCtx=nullptr, commitData=<unavailable>) at ep_bucket.cc:970:30 [opt]
 frame #14: 0x000000010a6f4d85 memcached`EPBucket::flushVBucket_UNLOCKED(this=0x0000000110783000, vb=<unavailable>) at ep_bucket.cc:843:10 [opt]
 frame #15: 0x000000010a6f3bff memcached`EPBucket::flushVBucket(this=0x0000000110783000, vbid=<unavailable>) at ep_bucket.cc:383:12 [opt]
 frame #16: 0x000000010a6d0e94 memcached`Flusher::flushVB(this=0x0000000110e59000) at flusher.cc:293:29 [opt]
 frame #17: 0x000000010a6d0a47 memcached`Flusher::step(this=0x0000000110e59000, task=0x0000000110ef4b78) at flusher.cc:203:21 [opt]
 frame #18: 0x000000010a9048bf memcached`GlobalTask::execute(this=0x0000000110ef4b78, threadName="WriterPool3") at globaltask.cc:98:21 [opt]
 frame #19: 0x000000010a907e59 memcached`FollyExecutorPool::TaskProxy::scheduleViaCPUPool(this=0x0000700005704bb0)::'lambda0'()::operator()() const at folly_executorpool.cc:163:41 [opt]
 frame #20: 0x000000010a9112ec memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x0000700005704bb0)() at Function.h:416:12 [opt]
 frame #21: 0x000000010a9112dc memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] CancellableCPUExecutor::add(this=<unavailable>)>)::$_0::operator()() const at cancellable_cpu_executor.cc:42:13 [opt]
 frame #22: 0x000000010a910edf memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(p=<unavailable>)>)::$_0>(folly::detail::function::Data&) at Function.h:387:7 [opt]
 frame #23: 0x000000010aa66e92 memcached`folly::ThreadPoolExecutor::runTask(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=<unavailable>)() at Function.h:416:12 [opt]
 frame #24: 0x000000010aa66e8c memcached`folly::ThreadPoolExecutor::runTask(this=<unavailable>, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77f820 strong=3 weak=1, task=0x0000700005704e10) at ThreadPoolExecutor.cpp:97 [opt]
 frame #25: 0x000000010aa55ffe memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d8900, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b77f820 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:265:5 [opt]
 frame #26: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #27: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #28: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #29: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #30: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d000)() at Function.h:416:12 [opt]
 frame #31: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d000)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #32: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905460)() at Function.h:416:12 [opt]
 frame #33: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905460)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #34: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905460)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #35: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #36: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905450) at thread:298:5 [opt]
 frame #37: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #38: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #36, name = 'AuxIoPool0'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005787b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005787b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005787b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005787b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a57caf, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00198, deadline=0x0000700005787cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8d3704710, deadline=0x0000700005787cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8d3704710, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8d3704700, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d9500, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010b7801e0 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d040)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d040)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9054d0)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9054d0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9054d0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b9054c0) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #37, name = 'AuxIoPool1'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x000070000580ab38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x000070000580ab38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000070000580ab10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x000070000580ab08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a50048, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00090, deadline=0x000070000580acb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8d3704710, deadline=0x000070000580acb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8d3704710, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8d3704700, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d9500, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d5ce440 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d080)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d080)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905540)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905540)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905540)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905530) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #38, name = 'AuxIoPool2'
 frame #0: 0x00007ff81745fbd2 libsystem_kernel.dylib`__psynch_mutexwait + 10
 frame #1: 0x00007ff817497e7e libsystem_pthread.dylib`_pthread_mutex_firstfit_lock_wait + 76
 frame #2: 0x00007ff817495cbb libsystem_pthread.dylib`_pthread_mutex_firstfit_lock_slow + 205
 frame #3: 0x00007ff8173fa719 libc++.1.dylib`std::__1::mutex::lock() + 9
 frame #4: 0x000000010a891081 memcached`magma::WALOffset::String() [inlined] std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__get_long_cap(this=<unavailable>) const at string:1559:34 [opt]
 frame #5: 0x000000010a89225a memcached`magma::WALOffset::String(this=<unavailable>) at wal_offset.cc:25 [opt]
 frame #6: 0x000000010a80631a memcached`magma::Magma::Impl::syncKVStore(this=<unavailable>, kvID=<unavailable>, checkpoint=false) at db.cc:1352:21 [opt]
 frame #7: 0x000000010a806122 memcached`magma::Magma::Impl::SyncKVStore(this=<unavailable>, kvID=<unavailable>) at db.cc:350:12 [opt]
 frame #8: 0x000000010a806451 memcached`magma::Magma::SyncKVStore(this=<unavailable>, kvID=<unavailable>) at db.cc:354:18 [opt]
 frame #9: 0x000000010a58206f memcached`MagmaMemoryTrackingProxy::SyncKVStore(this=0x0000000110c33058, kvID=<unavailable>) at magma-memory-tracking-proxy.cc:477:19 [opt]
 frame #10: 0x000000010a5db4b9 memcached`MagmaKVStore::makeFileHandle(this=0x0000000110c0d400, vbid=(vbid = 9)) const at magma-kvstore.cc:2806:26 [opt]
 frame #11: 0x000000010a5d2a0f memcached`MagmaKVStore::initBySeqnoScanContext(this=0x0000000110c0d400, cb=StatusCallback<GetValue> @ 0x000000010d64ed70, cl=StatusCallback<CacheLookup> @ 0x000000010d64ed40, vbid=(vbid = 9), startSeqno=1, options=ALL_ITEMS, valOptions=VALUES_COMPRESSED, source=Head, fileHandle=KVFileHandle @ 0x000070000588d8f0) const at magma-kvstore.cc:1670:18 [opt]
 frame #12: 0x000000010a791eaa memcached`DCPBackfillBySeqnoDisk::create(this=0x0000000110ecbec0) at backfill_by_seqno_disk.cc:66:29 [opt]
 frame #13: 0x000000010a794ac2 memcached`DCPBackfillDisk::run(this=0x0000000110ecbec0) at backfill_disk.cc:151:16 [opt]
 frame #14: 0x000000010a795a9f memcached`BackfillManager::backfill(this=0x00000001110c8998) at backfill-manager.cc:344:42 [opt]
 frame #15: 0x000000010a795609 memcached`BackfillManagerTask::run(this=0x000000010b934738) at backfill-manager.cc:78:41 [opt]
 frame #16: 0x000000010a9048bf memcached`GlobalTask::execute(this=0x000000010b934738, threadName="AuxIoPool2") at globaltask.cc:98:21 [opt]
 frame #17: 0x000000010a907e59 memcached`FollyExecutorPool::TaskProxy::scheduleViaCPUPool(this=0x000070000588dbb0)::'lambda0'()::operator()() const at folly_executorpool.cc:163:41 [opt]
 frame #18: 0x000000010a9112ec memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000070000588dbb0)() at Function.h:416:12 [opt]
 frame #19: 0x000000010a9112dc memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::$_0>(folly::detail::function::Data&) [inlined] CancellableCPUExecutor::add(this=<unavailable>)>)::$_0::operator()() const at cancellable_cpu_executor.cc:42:13 [opt]
 frame #20: 0x000000010a910edf memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<CancellableCPUExecutor::add(p=<unavailable>)>)::$_0>(folly::detail::function::Data&) at Function.h:387:7 [opt]
 frame #21: 0x000000010aa66e92 memcached`folly::ThreadPoolExecutor::runTask(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=<unavailable>)() at Function.h:416:12 [opt]
 frame #22: 0x000000010aa66e8c memcached`folly::ThreadPoolExecutor::runTask(this=<unavailable>, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d5ce620 strong=3 weak=1, task=0x000070000588de10) at ThreadPoolExecutor.cpp:97 [opt]
 frame #23: 0x000000010aa55ffe memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d9500, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d5ce620 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:265:5 [opt]
 frame #24: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #25: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #26: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #27: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #28: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d0c0)() at Function.h:416:12 [opt]
 frame #29: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d0c0)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #30: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9055b0)() at Function.h:416:12 [opt]
 frame #31: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9055b0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #32: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9055b0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #33: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #34: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b9055a0) at thread:298:5 [opt]
 frame #35: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #36: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #39, name = 'AuxIoPool3'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005910b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005910b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005910b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005910b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a548ce, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee001e0, deadline=0x0000700005910cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8d3704710, deadline=0x0000700005910cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8d3704710, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8d3704700, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d9500, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d5ce800 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d140)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d140)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905620)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905620)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905620)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905610) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #40, name = 'AuxIoPool4'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005993b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005993b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005993b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005993b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a585dd, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee001f8, deadline=0x0000700005993cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8d3704710, deadline=0x0000700005993cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8d3704710, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8d3704700, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d9500, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d5ce860 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d180)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d180)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905690)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905690)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905690)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905680) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #41, name = 'AuxIoPool5'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005a16b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005a16b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005a16b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005a16b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a53a49, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00210, deadline=0x0000700005a16cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8d3704710, deadline=0x0000700005a16cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8d3704710, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8d3704700, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d9500, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d5ce8c0 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d100)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d100)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905700)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905700)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905700)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b9056f0) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #42, name = 'AuxIoPool6'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005a99b38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005a99b38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005a99b10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005a99b08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a56293, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00228, deadline=0x0000700005a99cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8d3704710, deadline=0x0000700005a99cb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8d3704710, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8d3704700, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d9500, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d5ce920 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d17b6c0)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d17b6c0)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905770)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905770)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905770)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905760) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #43, name = 'AuxIoPool7'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005b1cb38, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005b1cb38, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005b1cb10, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005b1cb08)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa5bec9 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=2, deadline=0x0005b97a32a52d56, waitMask=4294967295) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:164 [opt]
 frame #12: 0x000000010aa5bea3 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00240, deadline=0x0000700005b1ccb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #13: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #14: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8d3704710, deadline=0x0000700005b1ccb0) at LifoSem.h:521 [opt]
 frame #15: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8d3704710, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #16: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8d3704700, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #17: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d5d9500, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d5ce980 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #18: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #19: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #22: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d200)() at Function.h:416:12 [opt]
 frame #23: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d200)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #24: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9057e0)() at Function.h:416:12 [opt]
 frame #25: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9057e0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #26: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9057e0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b9057d0) at thread:298:5 [opt]
 frame #29: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #30: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #44, name = 'NonIoPool0'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005b9fae8, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005b9fae8, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005b9fac0, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005b9fab8)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa75d8a memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(folly::detail::FutexResult&, std::__1::atomic<unsigned int>&, unsigned int, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, unsigned int, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >, unsigned long, float) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=<unavailable>, deadline=0x0005b9795aeab446, waitMask=<unavailable>) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa75d7a memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(folly::detail::FutexResult&, std::__1::atomic<unsigned int>&, unsigned int, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, unsigned int, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >, unsigned long, float) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=<unavailable>, deadline=<unavailable>, waitMask=<unavailable>) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa75d72 memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(_ret=0x0000700005b9fc04, fut=0x000000010ee00138, expected=2, deadline=0x0000700005b9fcb0, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:194 [opt]
 frame #12: 0x000000010aa5be5c memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:151:9 [opt]
 frame #13: 0x000000010aa5be33 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00138, deadline=0x0000700005b9fcb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #14: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #15: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8e3704c10, deadline=0x0000700005b9fcb0) at LifoSem.h:521 [opt]
 frame #16: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8e3704c10, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #17: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8e3704c00, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #18: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d640100, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d603a60 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #19: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #22: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #23: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d2c0)() at Function.h:416:12 [opt]
 frame #24: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d2c0)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #25: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905850)() at Function.h:416:12 [opt]
 frame #26: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905850)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905850)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #29: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905840) at thread:298:5 [opt]
 frame #30: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #31: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #45, name = 'NonIoPool1'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005c22ae8, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005c22ae8, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005c22ac0, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005c22ab8)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa75d8a memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(folly::detail::FutexResult&, std::__1::atomic<unsigned int>&, unsigned int, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, unsigned int, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >, unsigned long, float) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=<unavailable>, deadline=0x0005b978932fcf3a, waitMask=<unavailable>) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa75d7a memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(folly::detail::FutexResult&, std::__1::atomic<unsigned int>&, unsigned int, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, unsigned int, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >, unsigned long, float) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=<unavailable>, deadline=<unavailable>, waitMask=<unavailable>) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa75d72 memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(_ret=0x0000700005c22c04, fut=0x000000010ee00270, expected=2, deadline=0x0000700005c22cb0, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:194 [opt]
 frame #12: 0x000000010aa5be5c memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:151:9 [opt]
 frame #13: 0x000000010aa5be33 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00270, deadline=0x0000700005c22cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #14: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #15: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8e3704c10, deadline=0x0000700005c22cb0) at LifoSem.h:521 [opt]
 frame #16: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8e3704c10, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #17: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8e3704c00, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #18: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d640100, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d603ac0 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #19: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #22: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #23: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d300)() at Function.h:416:12 [opt]
 frame #24: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d300)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #25: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9058c0)() at Function.h:416:12 [opt]
 frame #26: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9058c0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9058c0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #29: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b9058b0) at thread:298:5 [opt]
 frame #30: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #31: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #46, name = 'NonIoPool2'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010aa50d71 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=<unavailable>, __lk=0x0000700005ca5ae8, __d=<unavailable>) at __mutex_base:0 [opt]
 frame #4: 0x000000010aa50d15 memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) [inlined] std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, __lk=0x0000700005ca5ae8, __t=<unavailable>) at __mutex_base:384 [opt]
 frame #5: 0x000000010aa50d0a memcached`std::__1::cv_status folly::parking_lot_detail::WaitNodeBase::wait<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x0000700005ca5ac0, deadline=<unavailable>) at ParkingLot.h:53 [opt]
 frame #6: 0x000000010aa50320 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::ParkResult folly::ParkingLot<unsigned int>::park_until<std::__1::atomic<unsigned int> const*, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(this=<unavailable>, bits=<unavailable>, data=<unavailable>, toPark=<unavailable>, preWait=<unavailable>, deadline=time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1, 1000000000> > > @ 0x0000700005ca5ab8)::'lambda1'(), folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'(), std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::atomic<unsigned int> const, unsigned int&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda1'()&&, folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int)::'lambda2'()&&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) at ParkingLot.h:283:22 [opt]
 frame #7: 0x000000010aa502f7 memcached`folly::detail::futexWaitImpl(std::__1::atomic<unsigned int> const*, unsigned int, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const*, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const*, unsigned int) [inlined] folly::detail::FutexResult folly::detail::(anonymous namespace)::emulatedFutexWaitImpl<std::__1::atomic<unsigned int> const>(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:201 [opt]
 frame #8: 0x000000010aa4fe90 memcached`folly::detail::futexWaitImpl(futex=<unavailable>, expected=<unavailable>, absSystemTime=<unavailable>, absSteadyTime=<unavailable>, waitMask=4294967295) at Futex.cpp:256 [opt]
 frame #9: 0x000000010aa75d8a memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(folly::detail::FutexResult&, std::__1::atomic<unsigned int>&, unsigned int, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, unsigned int, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >, unsigned long, float) [inlined] std::__1::enable_if<std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >::clock::is_steady, folly::detail::FutexResult>::type folly::detail::futexWaitImpl<std::__1::atomic<unsigned int> const, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > >(futex=<unavailable>, expected=<unavailable>, deadline=0x0005b979918afc87, waitMask=<unavailable>) at Futex-inl.h:85:10 [opt]
 frame #10: 0x000000010aa75d7a memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(folly::detail::FutexResult&, std::__1::atomic<unsigned int>&, unsigned int, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, unsigned int, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >, unsigned long, float) [inlined] folly::detail::FutexResult folly::detail::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(futex=<unavailable>, expected=<unavailable>, deadline=<unavailable>, waitMask=<unavailable>) at Futex-inl.h:124 [opt]
 frame #11: 0x000000010aa75d72 memcached`bool folly::detail::MemoryIdler::futexWaitPreIdle<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(_ret=0x0000700005ca5c04, fut=0x000000010ee00288, expected=2, deadline=0x0000700005ca5cb0, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:194 [opt]
 frame #12: 0x000000010aa5be5c memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&, folly::WaitOptions const&) [inlined] folly::detail::FutexResult folly::detail::MemoryIdler::futexWaitUntil<std::__1::atomic<unsigned int>, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(fut=<unavailable>, expected=2, deadline=<unavailable>, waitMask=4294967295, idleTimeout=<unavailable>, stackToRetain=1024, timeoutVariationFrac=0.5) at MemoryIdler.h:151:9 [opt]
 frame #13: 0x000000010aa5be33 memcached`bool folly::SaturatingSemaphore<true, std::__1::atomic>::tryWaitSlow<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000000010ee00288, deadline=0x0000700005ca5cb0, opt=<unavailable>) at SaturatingSemaphore.h:318 [opt]
 frame #14: 0x000000010aa5b81a memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > > const&) [inlined] bool folly::SaturatingSemaphore<true, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=<unavailable>, deadline=<unavailable>, opt=<unavailable>) at SaturatingSemaphore.h:179:12 [opt]
 frame #15: 0x000000010aa5b812 memcached`bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x00007fc8e3704c10, deadline=0x0000700005ca5cb0) at LifoSem.h:521 [opt]
 frame #16: 0x000000010aa58114 memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) [inlined] bool folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::__1::atomic>, std::__1::atomic>::try_wait_for<long long, std::__1::ratio<1l, 1000l> >(this=0x00007fc8e3704c10, timeout=<unavailable>) at LifoSem.h:498:12 [opt]
 frame #17: 0x000000010aa580ef memcached`folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for(this=0x00007fc8e3704c00, time=<unavailable>) at UnboundedBlockingQueue.h:41 [opt]
 frame #18: 0x000000010aa55fa9 memcached`folly::CPUThreadPoolExecutor::threadRun(this=0x000000010d640100, thread=std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>::element_type @ 0x000000010d603b20 strong=3 weak=1) at CPUThreadPoolExecutor.cpp:243:29 [opt]
 frame #19: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #20: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #21: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #22: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #23: 0x000000010a905f14 memcached`CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()::operator()() [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010d61d340)() at Function.h:416:12 [opt]
 frame #24: 0x000000010a905f0d memcached`CBRegisteredThreadFactory::newThread(this=0x000000010d61d340)>&&)::'lambda'()::operator()() at folly_executorpool.cc:49:13 [opt]
 frame #25: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b905930)() at Function.h:416:12 [opt]
 frame #26: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b905930)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #27: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b905930)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #28: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #29: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905920) at thread:298:5 [opt]
 frame #30: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #31: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #47, name = 'SchedulerPool0'
 frame #0: 0x00007ff81746234e libsystem_kernel.dylib`kevent + 10
 frame #1: 0x000000010b79b918 libevent_core-2.1.7.dylib`kq_dispatch + 728
 frame #2: 0x000000010b790fb3 libevent_core-2.1.7.dylib`event_base_loop + 787
 frame #3: 0x000000010aa6fe80 memcached`folly::EventBase::loopBody(this=0x000000010d1bf780, flags=0, ignoreKeepAlive=<unavailable>) at EventBase.cpp:397:19 [opt]
 frame #4: 0x000000010aa70d78 memcached`folly::EventBase::loopForever() [inlined] folly::EventBase::loop(this=0x000000010d1bf780) at EventBase.cpp:315:10 [opt]
 frame #5: 0x000000010aa70d55 memcached`folly::EventBase::loopForever(this=0x000000010d1bf780) at EventBase.cpp:538 [opt]
 frame #6: 0x000000010aa63102 memcached`folly::IOThreadPoolExecutor::threadRun(this=0x000000010b90be00, thread=<unavailable>) at IOThreadPoolExecutor.cpp:195:26 [opt]
 frame #7: 0x000000010aa6a7c4 memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] decltype(__f=<unavailable>, __a0=<unavailable>, __args=<unavailable>)).*fp(std::__1::forward<std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>(fp1))) std::__1::__invoke<void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&, void>(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&) at type_traits:4302:1 [opt]
 frame #8: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (__f=<unavailable>, __bound_args=<unavailable>, (null)=<unavailable>, __args=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, 0ul, 1ul, std::__1::tuple<> >(void (folly::ThreadPoolExecutor::*&)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >&, std::__1::__tuple_indices<0ul, 1ul>, std::__1::tuple<>&&) at functional:2644 [opt]
 frame #9: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) [inlined] std::__1::__bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<>, __is_valid_bind_return<void (folly::ThreadPoolExecutor::*)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), std::__1::tuple<folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread> >, std::__1::tuple<> >::value>::type std::__1::__bind<void (this=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&>::operator()<>() at functional:2677 [opt]
 frame #10: 0x000000010aa6a78c memcached`void folly::detail::function::FunctionTraits<void ()>::callSmall<std::__1::__bind<void (p=<unavailable>)(std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*, std::__1::shared_ptr<folly::ThreadPoolExecutor::Thread>&> >(folly::detail::function::Data&) at Function.h:387 [opt]
 frame #11: 0x000000010a9065de memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::detail::function::FunctionTraits<void ()>::operator(this=0x000000010b9059a0)() at Function.h:416:12 [opt]
 frame #12: 0x000000010a9065d7 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] folly::NamedThreadFactory::newThread(this=0x000000010b9059a0)>&&)::'lambda'()::operator()() at NamedThreadFactory.h:40:11 [opt]
 frame #13: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] decltype(__f=0x000000010b9059a0)>&&)::'lambda'()>(fp)()) std::__1::__invoke<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()&&) at type_traits:3918:1 [opt]
 frame #14: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(void*) [inlined] void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()>(__t=size=2, (null)=<unavailable>)>&&)::'lambda'()>&, std::__1::__tuple_indices<>) at thread:287:5 [opt]
 frame #15: 0x000000010a9065b4 memcached`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::'lambda'()> >(__vp=0x000000010b905990) at thread:298:5 [opt]
 frame #16: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #17: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #48, name = 'mg:flusher:0'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a8bb2ce memcached`magma::TaskQueue::dequeue(std::__1::atomic<bool>&) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=0x00000001107692f0, __lk=0x0000700005dabed0, __d=<unavailable>) at __mutex_base:0:72 [opt]
 frame #4: 0x000000010a8bb24f memcached`magma::TaskQueue::dequeue(this=0x00000001107692a0, shutdown=0x000000010d7ff5c9) at worker.cc:103:23 [opt]
 frame #5: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff5c0) at worker.cc:179:40 [opt]
 frame #6: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e1c0) at cb_pthreads.cc:51:9 [opt]
 frame #7: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e1c0) at cb_pthreads.cc:64:14 [opt]
 frame #8: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #9: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #49, name = 'mg:flusher:1'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a8bb2ce memcached`magma::TaskQueue::dequeue(std::__1::atomic<bool>&) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=0x00000001107692f0, __lk=0x0000700005e2eed0, __d=<unavailable>) at __mutex_base:0:72 [opt]
 frame #4: 0x000000010a8bb24f memcached`magma::TaskQueue::dequeue(this=0x00000001107692a0, shutdown=0x000000010d7ff609) at worker.cc:103:23 [opt]
 frame #5: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff600) at worker.cc:179:40 [opt]
 frame #6: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e1f0) at cb_pthreads.cc:51:9 [opt]
 frame #7: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e1f0) at cb_pthreads.cc:64:14 [opt]
 frame #8: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #9: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #50, name = 'mg:flusher:2'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a8bb2ce memcached`magma::TaskQueue::dequeue(std::__1::atomic<bool>&) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=0x00000001107692f0, __lk=0x0000700005eb1ed0, __d=<unavailable>) at __mutex_base:0:72 [opt]
 frame #4: 0x000000010a8bb24f memcached`magma::TaskQueue::dequeue(this=0x00000001107692a0, shutdown=0x000000010d7ff649) at worker.cc:103:23 [opt]
 frame #5: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff640) at worker.cc:179:40 [opt]
 frame #6: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e220) at cb_pthreads.cc:51:9 [opt]
 frame #7: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e220) at cb_pthreads.cc:64:14 [opt]
 frame #8: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #9: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #51, name = 'mg:flusher:3'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d93 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
 frame #3: 0x000000010a8bb2ce memcached`magma::TaskQueue::dequeue(std::__1::atomic<bool>&) [inlined] std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=0x00000001107692f0, __lk=0x0000700005f34ed0, __d=<unavailable>) at __mutex_base:0:72 [opt]
 frame #4: 0x000000010a8bb24f memcached`magma::TaskQueue::dequeue(this=0x00000001107692a0, shutdown=0x000000010d7ff689) at worker.cc:103:23 [opt]
 frame #5: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff680) at worker.cc:179:40 [opt]
 frame #6: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e250) at cb_pthreads.cc:51:9 [opt]
 frame #7: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e250) at cb_pthreads.cc:64:14 [opt]
 frame #8: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #9: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #52, name = 'mg:compactor:0'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff6c9) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff6c0) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e280) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e280) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #53, name = 'mg:compactor:1'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff709) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff700) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e2b0) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e2b0) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #54, name = 'mg:compactor:2'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff749) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff740) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e2e0) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e2e0) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #55, name = 'mg:compactor:3'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff789) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff780) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e310) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e310) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #56, name = 'mg:compactor:4'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff7c9) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff7c0) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e340) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e340) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #57, name = 'mg:compactor:5'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff809) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff800) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e370) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e370) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #58, name = 'mg:compactor:6'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff849) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff840) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e3a0) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e3a0) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #59, name = 'mg:compactor:7'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff889) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff880) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e3d0) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e3d0) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #60, name = 'mg:compactor:8'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff8c9) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff8c0) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e400) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e400) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #61, name = 'mg:compactor:9'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff909) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff900) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e430) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e430) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #62, name = 'mg:compactor:10'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff949) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff940) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e460) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e460) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #63, name = 'mg:compactor:11'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff989) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff980) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e490) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e490) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #64, name = 'mg:compactor:12'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ff9c9) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ff9c0) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e4c0) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e4c0) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #65, name = 'mg:compactor:13'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ffa09) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ffa00) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e4f0) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e4f0) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #66, name = 'mg:compactor:14'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ffa49) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ffa40) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e520) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e520) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15

thread #67, name = 'mg:compactor:15'
 frame #0: 0x00007ff8174603ea libsystem_kernel.dylib`__psynch_cvwait + 10
 frame #1: 0x00007ff81749aa6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
 frame #2: 0x00007ff8173f8d02 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
 frame #3: 0x000000010a8bb1fc memcached`magma::TaskQueue::dequeue(this=0x0000000110769380, shutdown=0x000000010d7ffa89) at worker.cc:105:23 [opt]
 frame #4: 0x000000010a8bb8d0 memcached`magma::TaskWorker::loop(w=0x000000010d7ffa80) at worker.cc:179:40 [opt]
 frame #5: 0x000000010aa34b0e memcached`platform_thread_wrap(void*) [inlined] CouchbaseThread::run(this=0x000000010d65e550) at cb_pthreads.cc:51:9 [opt]
 frame #6: 0x000000010aa34aca memcached`platform_thread_wrap(arg=0x000000010d65e550) at cb_pthreads.cc:64:14 [opt]
 frame #7: 0x00007ff81749a4e1 libsystem_pthread.dylib`_pthread_start + 125
 frame #8: 0x00007ff817495f6b libsystem_pthread.dylib`thread_start + 15
(lldb) (lldb)