GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-119.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /opt/couchbase/bin/memcached...Reading symbols from /usr/lib/debug/opt/couchbase/bin/memcached.debug...done.
done.
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Core was generated by `/opt/couchbase/bin/memcached -C /opt/couchbase/var/lib/couchbase/config/memcach'.
#0  0x00007fe7d3a6a387 in raise () from /lib64/libc.so.6

Thread 59 (LWP 56660):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=__cond@entry=0x7fe735e93a88) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=this@entry=0x7fe735e93a88, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x000000000092af7f in magma::KVStore::acquireFlushBarrier (this=this@entry=0x7fe735e93810) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:1457
#4  0x00000000009312f0 in magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::FlushMode, magma::BlockingMode) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:336
#5  0x0000000000931c58 in magma::KVStore::FlushMemTables (this=<optimized out>, wal=<optimized out>, flushMode=<optimized out>, blockMode=<optimized out>)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:316
#6  0x00000000008df0af in magma::Magma::Impl::tryWriteCacheFlush(magma::BlockingMode, magma::FlushMode) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/db.cc:1110
#7  0x00000000008fddde in magma::Magma::Impl::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/db_write.cc:50
#8  0x00000000008fdf32 in magma::Magma::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#9  0x0000000000867bdf in MagmaMemoryTrackingProxy::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#10 0x00000000008554c6 in MagmaKVStore::saveDocs(MagmaKVStoreTransactionContext&, VB::Commit&, kvstats_ctx&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/include/memcached/vbucket.h:62
#11 0x000000000084cf5c in MagmaKVStore::commit(std::unique_ptr<TransactionContext, std::default_delete<TransactionContext> >, VB::Commit&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/kvstore/magma-kvstore/magma-kvstore.cc:607
#12 0x00000000007f65e5 in EPBucket::commit(KVStoreIface&, std::unique_ptr<TransactionContext, std::default_delete<TransactionContext> >, VB::Commit&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:929
#13 0x00000000007fdc15 in EPBucket::flushVBucket_UNLOCKED(LockedVBucketPtr) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:801
#14 0x00000000007fe01f in EPBucket::flushVBucket(Vbid) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:378
#15 0x00000000006d5350 in Flusher::flushVB (this=0x7fe73ab80000) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:285
#16 0x00000000006d5ca0 in Flusher::step(GlobalTask*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:200
#17 0x0000000000a1dff2 in GlobalTask::execute() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/globaltask.cc:68
#18 0x0000000000a1b115 in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}::operator()() const (__closure=0x7fe6acfeb840)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:189
#19 0x0000000000b788f0 in operator() (this=0x7fe6acfeb840) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
#20 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (this=0x7fe7d24e3400, thread=..., 
    task=<unknown type in /usr/lib/debug/opt/couchbase/bin/memcached.debug, CU 0x68a52e2, DIE 0x68ea980>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/ThreadPoolExecutor.cpp:97
#21 0x0000000000b606aa in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe7d24e3400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:265
#22 0x0000000000b7b8a9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (
    __t=<optimized out>, __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
#23 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
#24 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
#25 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
#26 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
#27 0x0000000000a1ac94 in operator() (this=0x7fe7c47fa080) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
#28 operator() (__closure=0x7fe7c47fa080) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
#29 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
#30 0x00007fe7d43e9d40 in execute_native_thread_routine () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/thread.cc:80
#31 0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#32 0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 58 (LWP 56659):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=__cond@entry=0x7fe738f84e88) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=this@entry=0x7fe738f84e88, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x000000000092af7f in magma::KVStore::acquireFlushBarrier (this=this@entry=0x7fe738f84c10) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:1457
#4  0x00000000009312f0 in magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::FlushMode, magma::BlockingMode) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:336
#5  0x0000000000931c58 in magma::KVStore::FlushMemTables (this=<optimized out>, wal=<optimized out>, flushMode=<optimized out>, blockMode=<optimized out>)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:316
#6  0x00000000008df0af in magma::Magma::Impl::tryWriteCacheFlush(magma::BlockingMode, magma::FlushMode) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/db.cc:1110
#7  0x00000000008fddde in magma::Magma::Impl::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/db_write.cc:50
#8  0x00000000008fdf32 in magma::Magma::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#9  0x0000000000867bdf in MagmaMemoryTrackingProxy::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#10 0x00000000008554c6 in MagmaKVStore::saveDocs(MagmaKVStoreTransactionContext&, VB::Commit&, kvstats_ctx&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/include/memcached/vbucket.h:62
#11 0x000000000084cf5c in MagmaKVStore::commit(std::unique_ptr<TransactionContext, std::default_delete<TransactionContext> >, VB::Commit&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/kvstore/magma-kvstore/magma-kvstore.cc:607
#12 0x00000000007f65e5 in EPBucket::commit(KVStoreIface&, std::unique_ptr<TransactionContext, std::default_delete<TransactionContext> >, VB::Commit&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:929
#13 0x00000000007fdc15 in EPBucket::flushVBucket_UNLOCKED(LockedVBucketPtr) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:801
#14 0x00000000007fe01f in EPBucket::flushVBucket(Vbid) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:378
#15 0x00000000006d5350 in Flusher::flushVB (this=0x7fe7402b6600) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:285
#16 0x00000000006d5ca0 in Flusher::step(GlobalTask*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:200
#17 0x0000000000a1dff2 in GlobalTask::execute() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/globaltask.cc:68
#18 0x0000000000a1b115 in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}::operator()() const (__closure=0x7fe6ad7ec840)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:189
#19 0x0000000000b788f0 in operator() (this=0x7fe6ad7ec840) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
#20 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (this=0x7fe7d24e3400, thread=..., 
    task=<unknown type in /usr/lib/debug/opt/couchbase/bin/memcached.debug, CU 0x68a52e2, DIE 0x68ea980>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/ThreadPoolExecutor.cpp:97
#21 0x0000000000b606aa in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe7d24e3400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:265
#22 0x0000000000b7b8a9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (
    __t=<optimized out>, __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
#23 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
#24 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
#25 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
#26 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
#27 0x0000000000a1ac94 in operator() (this=0x7fe7c457bb80) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
#28 operator() (__closure=0x7fe7c457bb80) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
#29 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
#30 0x00007fe7d43e9d40 in execute_native_thread_routine () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/thread.cc:80
#31 0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#32 0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 57 (LWP 56657):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=__cond@entry=0x7fe73a8f7288) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=this@entry=0x7fe73a8f7288, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x000000000092af7f in magma::KVStore::acquireFlushBarrier (this=this@entry=0x7fe73a8f7010) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:1457
#4  0x00000000009312f0 in magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::FlushMode, magma::BlockingMode) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:336
#5  0x0000000000931c58 in magma::KVStore::FlushMemTables (this=<optimized out>, wal=<optimized out>, flushMode=<optimized out>, blockMode=<optimized out>)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:316
#6  0x00000000008df0af in magma::Magma::Impl::tryWriteCacheFlush(magma::BlockingMode, magma::FlushMode) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/db.cc:1110
#7  0x00000000008fddde in magma::Magma::Impl::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/db_write.cc:50
#8  0x00000000008fdf32 in magma::Magma::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#9  0x0000000000867bdf in MagmaMemoryTrackingProxy::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#10 0x00000000008554c6 in MagmaKVStore::saveDocs(MagmaKVStoreTransactionContext&, VB::Commit&, kvstats_ctx&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/include/memcached/vbucket.h:62
#11 0x000000000084cf5c in MagmaKVStore::commit(std::unique_ptr<TransactionContext, std::default_delete<TransactionContext> >, VB::Commit&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/kvstore/magma-kvstore/magma-kvstore.cc:607
#12 0x00000000007f65e5 in EPBucket::commit(KVStoreIface&, std::unique_ptr<TransactionContext, std::default_delete<TransactionContext> >, VB::Commit&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:929
#13 0x00000000007fdc15 in EPBucket::flushVBucket_UNLOCKED(LockedVBucketPtr) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:801
#14 0x00000000007fe01f in EPBucket::flushVBucket(Vbid) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:378
#15 0x00000000006d5350 in Flusher::flushVB (this=0x7fe73ab80700) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:285
#16 0x00000000006d5ca0 in Flusher::step(GlobalTask*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:200
#17 0x0000000000a1dff2 in GlobalTask::execute() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/globaltask.cc:68
#18 0x0000000000a1b115 in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}::operator()() const (__closure=0x7fe6adfed840)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:189
#19 0x0000000000b788f0 in operator() (this=0x7fe6adfed840) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
#20 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (this=0x7fe7d24e3400, thread=..., 
    task=<unknown type in /usr/lib/debug/opt/couchbase/bin/memcached.debug, CU 0x68a52e2, DIE 0x68ea980>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/ThreadPoolExecutor.cpp:97
#21 0x0000000000b606aa in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe7d24e3400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:265
#22 0x0000000000b7b8a9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (
    __t=<optimized out>, __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
#23 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
#24 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
#25 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
#26 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
#27 0x0000000000a1ac94 in operator() (this=0x7fe7d29dee00) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
#28 operator() (__closure=0x7fe7d29dee00) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
#29 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
#30 0x00007fe7d43e9d40 in execute_native_thread_routine () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/thread.cc:80
#31 0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#32 0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 56 (LWP 56656):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=__cond@entry=0x7fe733e53488) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=this@entry=0x7fe733e53488, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x000000000092af7f in magma::KVStore::acquireFlushBarrier (this=this@entry=0x7fe733e53210) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:1457
#4  0x00000000009312f0 in magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::FlushMode, magma::BlockingMode) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:336
#5  0x0000000000931c58 in magma::KVStore::FlushMemTables (this=<optimized out>, wal=<optimized out>, flushMode=<optimized out>, blockMode=<optimized out>)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/kvstore.cc:316
#6  0x00000000008df0af in magma::Magma::Impl::tryWriteCacheFlush(magma::BlockingMode, magma::FlushMode) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/db.cc:1110
#7  0x00000000008fddde in magma::Magma::Impl::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/db_write.cc:50
#8  0x00000000008fdf32 in magma::Magma::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#9  0x0000000000867bdf in MagmaMemoryTrackingProxy::WriteDocs(unsigned short, std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> > const&, unsigned int, std::function<void (magma::Magma::WriteOperation const&, bool, magma::Slice)>, std::function<magma::Status (std::vector<magma::Magma::WriteOperation, std::allocator<magma::Magma::WriteOperation> >&)>) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#10 0x00000000008554c6 in MagmaKVStore::saveDocs(MagmaKVStoreTransactionContext&, VB::Commit&, kvstats_ctx&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/include/memcached/vbucket.h:62
#11 0x000000000084cf5c in MagmaKVStore::commit(std::unique_ptr<TransactionContext, std::default_delete<TransactionContext> >, VB::Commit&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/kvstore/magma-kvstore/magma-kvstore.cc:607
#12 0x00000000007f65e5 in EPBucket::commit(KVStoreIface&, std::unique_ptr<TransactionContext, std::default_delete<TransactionContext> >, VB::Commit&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:929
#13 0x00000000007fdc15 in EPBucket::flushVBucket_UNLOCKED(LockedVBucketPtr) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:801
#14 0x00000000007fe01f in EPBucket::flushVBucket(Vbid) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:378
#15 0x00000000006d5350 in Flusher::flushVB (this=0x7fe7402b7400) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:285
#16 0x00000000006d5ca0 in Flusher::step(GlobalTask*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:200
#17 0x0000000000a1dff2 in GlobalTask::execute() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/globaltask.cc:68
#18 0x0000000000a1b115 in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}::operator()() const (__closure=0x7fe6f4bed840)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:189
#19 0x0000000000b788f0 in operator() (this=0x7fe6f4bed840) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
#20 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (this=0x7fe7d24e3400, thread=..., 
    task=<unknown type in /usr/lib/debug/opt/couchbase/bin/memcached.debug, CU 0x68a52e2, DIE 0x68ea980>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/ThreadPoolExecutor.cpp:97
#21 0x0000000000b606aa in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe7d24e3400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:265
#22 0x0000000000b7b8a9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (
    __t=<optimized out>, __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
#23 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
#24 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
#25 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
#26 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
#27 0x0000000000a1ac94 in operator() (this=0x7fe7d253d000) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
#28 operator() (__closure=0x7fe7d253d000) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
#29 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
#30 0x00007fe7d43e9d40 in execute_native_thread_routine () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/thread.cc:80
#31 0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#32 0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 55 (LWP 51967):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d5712fa2 in background_thread_sleep (tsdn=<optimized out>, interval=<optimized out>, info=<optimized out>) at src/background_thread.c:232
#2  background_work_sleep_once (ind=<optimized out>, info=<optimized out>, tsdn=<optimized out>) at src/background_thread.c:307
#3  background_work (ind=<optimized out>, tsd=0x7fe7449ee220) at src/background_thread.c:497
#4  background_thread_entry (ind_arg=<optimized out>) at src/background_thread.c:522
#5  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 54 (LWP 51961):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=<optimized out>, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x0000000000959288 in magma::TaskQueue::dequeue(std::atomic<bool>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:101
#4  0x0000000000959671 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:160
#5  0x0000000000b14a09 in run (this=0x7fe7d2549ec0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#6  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#7  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#8  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 53 (LWP 51960):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=<optimized out>, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x0000000000959288 in magma::TaskQueue::dequeue(std::atomic<bool>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:101
#4  0x0000000000959671 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:160
#5  0x0000000000b14a09 in run (this=0x7fe7d2549e90) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#6  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#7  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#8  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 52 (LWP 51959):
#0  0x00007fe7d570d685 in extent_list_remove (extent=0x7fe714f87cc0, list=0x7fe740408308) at include/jemalloc/internal/extent_inlines.h:440
#1  arena_bin_slabs_full_remove (slab=0x7fe714f87cc0, bin=0x7fe740408288, arena=0x7fe7404008c0) at src/arena.c:1061
#2  arena_dalloc_bin_locked_impl (junked=true, ptr=<optimized out>, slab=0x7fe714f87cc0, binind=<error reading variable: Cannot access memory at address 0x7fe7404006cc>, bin=0x7fe740408288, arena=0x7fe7404008c0, 
    tsdn=<error reading variable: Cannot access memory at address 0x7fe740400708>) at src/arena.c:1701
#3  je_arena_dalloc_bin_junked_locked (tsdn=tsdn@entry=0x7fe747fde220, arena=arena@entry=0x7fe7404008c0, bin=bin@entry=0x7fe740408288, binind=binind@entry=6, extent=0x7fe714f87cc0, ptr=<optimized out>) at src/arena.c:1714
#4  0x00007fe7d577c73d in je_tcache_bin_flush_small (tsd=tsd@entry=0x7fe747fde220, tcache=tcache@entry=0x7fe7293bb000, tbin=tbin@entry=0x7fe7293bb0a0, binind=binind@entry=6, rem=<optimized out>) at src/tcache.c:189
#5  0x00007fe7d577d980 in je_tcache_event_hard (tsd=tsd@entry=0x7fe747fde220, tcache=tcache@entry=0x7fe7293bb000) at src/tcache.c:55
#6  0x00007fe7d5706ebd in tcache_event (tcache=0x7fe7293bb000, tsd=<optimized out>) at include/jemalloc/internal/tcache_inlines.h:37
#7  tcache_dalloc_large (slow_path=<optimized out>, binind=<optimized out>, ptr=<optimized out>, tcache=<optimized out>, tsd=<optimized out>) at include/jemalloc/internal/tcache_inlines.h:212
#8  arena_dalloc_large (slow_path=<optimized out>, szind=<optimized out>, tcache=<optimized out>, ptr=<optimized out>, tsdn=<optimized out>) at include/jemalloc/internal/arena_inlines_b.h:276
#9  arena_sdalloc (slow_path=<optimized out>, alloc_ctx=<optimized out>, tcache=<optimized out>, size=<optimized out>, ptr=<optimized out>, tsdn=<optimized out>) at include/jemalloc/internal/arena_inlines_b.h:423
#10 isdalloct (slow_path=<optimized out>, alloc_ctx=<optimized out>, tcache=<optimized out>, size=<optimized out>, ptr=<optimized out>, tsdn=<optimized out>) at include/jemalloc/internal/jemalloc_internal_inlines_c.h:131
#11 isfree (slow_path=<optimized out>, tcache=<optimized out>, usize=<optimized out>, ptr=<optimized out>, tsd=<optimized out>) at src/jemalloc.c:2646
#12 je_sdallocx_default (ptr=0x7fe732001680, size=<optimized out>, flags=<optimized out>) at src/jemalloc.c:3587
#13 0x0000000000b26316 in cb::_JEArenaMalloc<cb::JEArenaCoreLocalTracker>::sized_free (ptr=ptr@entry=0x7fe732001680, size=size@entry=24) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/je_arena_malloc.cc:317
#14 0x00000000005b6ff6 in sized_free (size=24, ptr=0x7fe732001680) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_malloc_arena.cc:75
#15 cb_sized_free (ptr=0x7fe732001680, size=24) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_malloc_arena.cc:75
#16 0x0000000000861cfe in MagmaKVStore::compactionCallBack(MagmaKVStore::MagmaCompactionCB&, magma::Slice const&, magma::Slice const&, magma::Slice const&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/kvstore/magma-kvstore/magma-kvstore.cc:279
#17 0x00000000009136ed in magma::DocSeqGCContext::Transform (this=0x7fe738a1e000, key=..., value=..., buffer=..., outputValue=0x7fe747fdcd60) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/magma/kvstore/format.h:44
#18 0x00000000009bec05 in magma::ItemGCFilter::Process(std::vector<std::pair<magma::Slice, magma::Slice>, std::allocator<std::pair<magma::Slice, magma::Slice> > >&, std::vector<std::pair<magma::Slice, magma::Slice>, std::allocator<std::pair<magma::Slice, magma::Slice> > >*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/mvcc.cc:106
#19 0x00000000009960c2 in magma::LSMTree::mergeSSTables(std::vector<std::shared_ptr<magma::Table>, std::allocator<std::shared_ptr<magma::Table> > >&, magma::ItemGCFilter&, unsigned long, double, std::vector<std::shared_ptr<magma::Table>, std::allocator<std::shared_ptr<magma::Table> > >*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/lsm_tree.cc:725
#20 0x000000000096c2c3 in magma::LSMTree::compactLevelForInputs(int, int, std::unique_lock<std::mutex>&, std::vector<std::shared_ptr<magma::Table>, std::allocator<std::shared_ptr<magma::Table> > >&, std::vector<std::shared_ptr<magma::Table>, std::allocator<std::shared_ptr<magma::Table> > >&, bool, std::function<std::unique_ptr<magma::GCContext, std::default_delete<magma::GCContext> > (bool)>) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/compaction.cc:174
#21 0x000000000096ed1a in magma::LSMTree::compactLevel(int, std::unique_lock<std::mutex>&, bool, std::function<std::unique_ptr<magma::GCContext, std::default_delete<magma::GCContext> > (bool)>) ()
    at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#22 0x000000000096efac in magma::LSMTree::compact(std::unique_lock<std::mutex>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/compaction.cc:345
#23 0x0000000000988f28 in doCompactionWork (this=0x7fe737276000) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/lsm_tree.cc:357
#24 operator() (__closure=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/lsm_tree.cc:367
#25 __invoke_impl<void, magma::LSMTree::queueCompaction()::<lambda()>&> (__f=...) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/invoke.h:60
#26 __invoke_r<void, magma::LSMTree::queueCompaction()::<lambda()>&> (__fn=...) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/invoke.h:110
#27 std::_Function_handler<void (), magma::LSMTree::queueCompaction()::{lambda()#1}>::_M_invoke(std::_Any_data const&) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:291
#28 0x0000000000957e8d in operator() (this=0x7fe736ab4d98) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#29 magma::TimedTask::Complete(bool) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:144
#30 0x0000000000959681 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:161
#31 0x0000000000b14a09 in run (this=0x7fe7d2549e60) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#32 platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#33 0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#34 0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 51 (LWP 51958):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=<optimized out>, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x0000000000959288 in magma::TaskQueue::dequeue(std::atomic<bool>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:101
#4  0x0000000000959671 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:160
#5  0x0000000000b14a09 in run (this=0x7fe7d2549e30) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#6  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#7  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#8  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 50 (LWP 51957):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=<optimized out>, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x0000000000959288 in magma::TaskQueue::dequeue(std::atomic<bool>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:101
#4  0x0000000000959671 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:160
#5  0x0000000000b14a09 in run (this=0x7fe7d2549e00) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#6  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#7  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#8  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 49 (LWP 51956):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=<optimized out>, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x0000000000959288 in magma::TaskQueue::dequeue(std::atomic<bool>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:101
#4  0x0000000000959671 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:160
#5  0x0000000000b14a09 in run (this=0x7fe7d2549dd0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#6  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#7  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#8  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 48 (LWP 51955):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=<optimized out>, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x0000000000959288 in magma::TaskQueue::dequeue(std::atomic<bool>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:101
#4  0x0000000000959671 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:160
#5  0x0000000000b14a09 in run (this=0x7fe7d2549da0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#6  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#7  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#8  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 47 (LWP 51954):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=<optimized out>, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x0000000000959288 in magma::TaskQueue::dequeue(std::atomic<bool>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:101
#4  0x0000000000959671 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:160
#5  0x0000000000b14a09 in run (this=0x7fe7d2549d70) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#6  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#7  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#8  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 46 (LWP 51952):
#0  0x00007fe7d6210efd in open64 () from /lib64/libpthread.so.0
#1  0x0000000000947ad5 in magma::BasicFile::Open(int) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/file/file_impl_linux.cc:93
#2  0x00000000009a613e in magma::FileWithStats::Open (this=<optimized out>, openFlags=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/file/file_impl_stats.cc:26
#3  0x000000000094e58d in magma::Cache<magma::ManagedFile*, magma::File>::makeObject(magma::ManagedFile*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/file_manager.cc:249
#4  0x0000000000954e65 in magma::Cache<magma::ManagedFile*, magma::File>::AcquireObject (this=0x7fe7bc6a3800, id=0x7fe733cd34a0, doCaching=<optimized out>) at /opt/gcc-10.2.0/include/c++/10.2.0/x86_64-pc-linux-gnu/bits/gthr-default.h:779
#5  0x000000000094f02d in magma::ManagedFile::Open(int) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/file_manager.cc:276
#6  0x00000000009aa32b in magma::SSTableIterator::initFileHandle() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/sstable/sstable.cc:679
#7  0x00000000009ae1df in magma::SSTableIterator::initStacks(magma::Slice const&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/sstable/sstable.cc:704
#8  0x00000000009aec36 in magma::SSTableIterator::SeekFirst (this=0x7fe737a91200) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/sstable/sstable.cc:777
#9  0x000000000096603d in magma::MergeIterator::SeekFirst (this=this@entry=0x7fe74b7e4000) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/iterator.cc:59
#10 0x0000000000996075 in magma::LSMTree::mergeSSTables(std::vector<std::shared_ptr<magma::Table>, std::allocator<std::shared_ptr<magma::Table> > >&, magma::ItemGCFilter&, unsigned long, double, std::vector<std::shared_ptr<magma::Table>, std::allocator<std::shared_ptr<magma::Table> > >*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/lsm_tree.cc:722
#11 0x000000000096c2c3 in magma::LSMTree::compactLevelForInputs(int, int, std::unique_lock<std::mutex>&, std::vector<std::shared_ptr<magma::Table>, std::allocator<std::shared_ptr<magma::Table> > >&, std::vector<std::shared_ptr<magma::Table>, std::allocator<std::shared_ptr<magma::Table> > >&, bool, std::function<std::unique_ptr<magma::GCContext, std::default_delete<magma::GCContext> > (bool)>) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/compaction.cc:174
#12 0x000000000096ed1a in magma::LSMTree::compactLevel(int, std::unique_lock<std::mutex>&, bool, std::function<std::unique_ptr<magma::GCContext, std::default_delete<magma::GCContext> > (bool)>) ()
    at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#13 0x000000000096efac in magma::LSMTree::compact(std::unique_lock<std::mutex>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/compaction.cc:345
#14 0x0000000000988f28 in doCompactionWork (this=0x7fe737158000) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/lsm_tree.cc:357
#15 operator() (__closure=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/lsm/lsm_tree.cc:367
#16 __invoke_impl<void, magma::LSMTree::queueCompaction()::<lambda()>&> (__f=...) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/invoke.h:60
#17 __invoke_r<void, magma::LSMTree::queueCompaction()::<lambda()>&> (__fn=...) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/invoke.h:110
#18 std::_Function_handler<void (), magma::LSMTree::queueCompaction()::{lambda()#1}>::_M_invoke(std::_Any_data const&) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:291
#19 0x0000000000957e8d in operator() (this=0x7fe738f79418) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_function.h:248
#20 magma::TimedTask::Complete(bool) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:144
#21 0x0000000000959681 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:161
#22 0x0000000000b14a09 in run (this=0x7fe7d2549d10) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#23 platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#24 0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#25 0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 45 (LWP 51951):
#0  0x00007fe7d620da35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fe7d43e48bc in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /tmp/deploy/objdir/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865
#2  std::condition_variable::wait (this=<optimized out>, __lock=...) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x0000000000959288 in magma::TaskQueue::dequeue(std::atomic<bool>&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:101
#4  0x0000000000959671 in magma::TaskWorker::loop(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/worker.cc:160
#5  0x0000000000b14a09 in run (this=0x7fe7d2549ce0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
#6  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
#7  0x00007fe7d6209ea5 in start_thread () from /lib64/libpthread.so.0
#8  0x00007fe7d3b328dd in clone () from /lib64/libc.so.6

Thread 44 (LWP 51950):
#0  0x00007fe7d6210fc3 in pread64 () from /lib64/libpthread.so.0
#1  0x0000000000948218 in magma::BasicFile::Read(long, unsigned long, char*, unsigned long*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/file/file_impl_linux.cc:145
#2  0x00000000009a646a in magma::FileWithStats::Read(long, unsigned long, char*, unsigned long*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/file/file_impl_stats.cc:39
#3  0x000000000094c3b6 in magma::BufferedFileReader::Read(magma::File*, long, unsigned long, magma::Slice&, unsigned long&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/rw_file.cc:273
#4  0x0000000000957624 in magma::ReadAndTransform(magma::File*, long, unsigned long, std::function<magma::Status (char const*, unsigned long, std::unique_ptr<char [], std::default_delete<char []> >&, unsigned long&)>, std::unique_ptr<char [], std::default_delete<char []> >&, unsigned long&, unsigned long&, magma::BufferedFileReader*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/block_cache.cc:39
No core file now.