Seeing multiple nodes with "Memcached exit 139" segmentation fault while Rebalancing in empty buckets.

Create 2 buckets on 1 node.
Add 7 more nodes to the cluster.
Rebalance

Seeing memcached segmentation fault errors on every node as

Port server memcached on node 'babysitter_of_ns_1@127.0.0.1' exited with status 139. Restarting. Messages: Tue Jun 4 15:02:45.811497 PDT 3: (sasl) Trying to connect to mccouch: "127.0.0.1:11213"
Tue Jun 4 15:02:45.811917 PDT 3: (sasl) Connected to mccouch: "127.0.0.1:11213"
Tue Jun 4 15:02:45.833151 PDT 3: Extension support isn't implemented in this version of bucket_engine
Tue Jun 4 15:02:45.848534 PDT 3: (sasl) Failed to load mutation log, falling back to key dump
Tue Jun 4 15:02:45.860711 PDT 3: (sasl) metadata loaded in 43 ms
Tue Jun 4 15:02:45.868725 PDT 3: (sasl) warmup completed in 51 ms
Tue Jun 4 15:02:46.253627 PDT 3: (default) Trying to connect to mccouch: "127.0.0.1:11213"
Tue Jun 4 15:02:46.254038 PDT 3: (default) Connected to mccouch: "127.0.0.1:11213"
Stack Trace here

[root@centos-63-x64 data]# gdb /opt/couchbase/bin/memcached core.memcached.25694
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /opt/couchbase/bin/memcached...done.
[New Thread 25700]
[New Thread 25701]
[New Thread 25707]
[New Thread 25702]
[New Thread 25708]
[New Thread 25706]
[New Thread 25704]
[New Thread 25697]
[New Thread 25709]
[New Thread 25711]
[New Thread 25705]
[New Thread 25696]
[New Thread 25712]
[New Thread 25694]
[New Thread 25698]
[New Thread 25695]
[New Thread 25710]
[New Thread 25699]
[New Thread 25713]
[New Thread 25703]
Reading symbols from /opt/couchbase/lib/memcached/libmemcached_utilities.so.0...done.
Loaded symbols for /opt/couchbase/lib/memcached/libmemcached_utilities.so.0
Reading symbols from /opt/couchbase/lib/libevent-2.0.so.5...done.
Loaded symbols for /opt/couchbase/lib/libevent-2.0.so.5
Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libm.so.6
Reading symbols from /lib64/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /opt/couchbase/lib/libtcmalloc_minimal.so.4...done.
Loaded symbols for /opt/couchbase/lib/libtcmalloc_minimal.so.4
Reading symbols from /lib64/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib64/libstdc++.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/libstdc++.so.6
Reading symbols from /lib64/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libgcc_s.so.1
Reading symbols from /opt/couchbase/lib/memcached/stdin_term_handler.so...done.
Loaded symbols for /opt/couchbase/lib/memcached/stdin_term_handler.so
Reading symbols from /opt/couchbase/lib/memcached/file_logger.so...done.
Loaded symbols for /opt/couchbase/lib/memcached/file_logger.so
Reading symbols from /opt/couchbase/lib/memcached/bucket_engine.so...done.
Loaded symbols for /opt/couchbase/lib/memcached/bucket_engine.so
Reading symbols from /opt/couchbase/lib/memcached/ep.so...done.
Loaded symbols for /opt/couchbase/lib/memcached/ep.so
Reading symbols from /opt/couchbase/lib/libcouchstore.so.1...done.
Loaded symbols for /opt/couchbase/lib/libcouchstore.so.1
Reading symbols from /opt/couchbase/lib/libsnappy.so.1...done.
Loaded symbols for /opt/couchbase/lib/libsnappy.so.1
Reading symbols from /opt/couchbase/lib/libicuuc.so.44...done.
Loaded symbols for /opt/couchbase/lib/libicuuc.so.44
Reading symbols from /opt/couchbase/lib/libicudata.so.44...(no debugging symbols found)...done.
Loaded symbols for /opt/couchbase/lib/libicudata.so.44
Reading symbols from /opt/couchbase/lib/libicui18n.so.44...done.
Loaded symbols for /opt/couchbase/lib/libicui18n.so.44
Core was generated by `/opt/couchbase/bin/memcached -X /opt/couchbase/lib/memcached/stdin_term_handler'.
Program terminated with signal 11, Segmentation fault.
#0 ExecutorThread::schedule (this=0x0, task=...) at src/scheduler.cc:179
179 src/scheduler.cc: No such file or directory.
in src/scheduler.cc
Missing separate debuginfos, use: debuginfo-install couchbase-server-2.1.0-701.x86_64
(gdb) t a a bt

Thread 20 (Thread 0x7f0858ef8700 (LWP 25703)):
#0 0x00007f086099f85d in fdatasync () from /lib64/libc.so.6
#1 0x00007f085b27867f in couch_sync (handle=<value optimized out>) at src/os.c:117
#2 0x00007f085b526a5f in cfs_sync (h=0x639b020) at src/couch-kvstore/couch-fs-stats.cc:88
#3 0x00007f085b27275f in couchstore_commit (db=0x5b10380) at src/couch_db.c:193
#4 0x00007f085b520536 in CouchKVStore::setVBucketState (this=0x5b8a000, vbucketId=152, vbstate=..., vb_change_type=1, newfile=224, notify=true)
at src/couch-kvstore/couch-kvstore.cc:728
#5 0x00007f085b521359 in CouchKVStore::snapshotVBuckets (this=0x5b8a000, vbstates=std::map with 129 elements =

) at src/couch-kvstore/couch-kvstore.cc:596
#6 0x00007f085b4b3ea3 in EventuallyPersistentStore::snapshotVBuckets (this=0x5b74000, priority=..., shardId=<value optimized out>) at src/ep.cc:765
#7 0x00007f085b501f6f in VBSnapshotTask::run (this=<value optimized out>) at src/tasks.cc:78
#8 0x00007f085b4e5139 in ExecutorThread::run (this=0x5bba9c0) at src/scheduler.cc:150
#9 0x00007f085b4e57dd in launch_executor_thread (arg=0x5bba9c0) at src/scheduler.cc:34
#10 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#11 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 19 (Thread 0x7f0852aee700 (LWP 25713)):
#0 0x00007f0860c5c43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085b4a798f in wait (this=0x6506700) at src/syncobject.hh:46
#2 Dispatcher::run (this=0x6506700) at src/dispatcher.cc:150
#3 0x00007f085b4a7f0d in launch_dispatcher_thread (arg=<value optimized out>) at src/dispatcher.cc:28
#4 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#5 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 18 (Thread 0x7f085d57c700 (LWP 25699)):
#0 0x00007f08609a6f03 in epoll_wait () from /lib64/libc.so.6
#1 0x00007f086175a576 in epoll_dispatch (base=0x5b0ac80, tv=<value optimized out>) at epoll.c:404
#2 0x00007f0861745e44 in event_base_loop (base=0x5b0ac80, flags=<value optimized out>) at event.c:1558
#3 0x0000000000414604 in worker_libevent (arg=0x12a5af0) at daemon/thread.c:301
#4 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#5 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 17 (Thread 0x7f08548f1700 (LWP 25710)):
#0 0x00007f0860c5c7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085b4e500e in wait (this=0x64f2d00) at src/syncobject.hh:57
#2 ExecutorThread::run (this=0x64f2d00) at src/scheduler.cc:140
#3 0x00007f085b4e57dd in launch_executor_thread (arg=0x64f2d00) at src/scheduler.cc:34
#4 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#5 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 16 (Thread 0x7f08601a0700 (LWP 25695)):
#0 0x00007f086099960d in read () from /lib64/libc.so.6
#1 0x00007f086092ff68 in _IO_new_file_underflow () from /lib64/libc.so.6
#2 0x00007f0860931a6e in _IO_default_uflow_internal () from /lib64/libc.so.6
#3 0x00007f086092614a in _IO_getline_info_internal () from /lib64/libc.so.6
#4 0x00007f0860924fa9 in fgets () from /lib64/libc.so.6
#5 0x00007f08601a1939 in check_stdin_thread (arg=<value optimized out>) at extensions/daemon/stdin_check.c:37
#6 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#7 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 15 (Thread 0x7f085df7d700 (LWP 25698)):
--Type <return> to continue, or q <return> to quit--
#0 0x00007f08609a6f03 in epoll_wait () from /lib64/libc.so.6
#1 0x00007f086175a576 in epoll_dispatch (base=0x5b0a280, tv=<value optimized out>) at epoll.c:404
#2 0x00007f0861745e44 in event_base_loop (base=0x5b0a280, flags=<value optimized out>) at event.c:1558
#3 0x0000000000414604 in worker_libevent (arg=0x12a59f8) at daemon/thread.c:301
#4 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#5 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7f0861d95720 (LWP 25694)):
#0 0x00007f08609a6f03 in epoll_wait () from /lib64/libc.so.6
#1 0x00007f086175a576 in epoll_dispatch (base=0x5b0a000, tv=<value optimized out>) at epoll.c:404
#2 0x00007f0861745e44 in event_base_loop (base=0x5b0a000, flags=<value optimized out>) at event.c:1558
#3 0x00000000004097d6 in main (argc=<value optimized out>, argv=<value optimized out>) at daemon/memcached.c:7926

Thread 13 (Thread 0x7f08534ef700 (LWP 25712)):
#0 0x00007f0860c5c7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085b4c157f in wait (this=0x5b62900) at src/syncobject.hh:57
#2 wait (this=0x5b62900) at src/syncobject.hh:73
#3 wait (this=0x5b62900) at src/tapconnmap.hh:169
#4 EventuallyPersistentEngine::notifyPendingConnections (this=0x5b62900) at src/ep_engine.cc:3388
#5 0x00007f085b4c1663 in EvpNotifyPendingConns (arg=0x5b62900) at src/ep_engine.cc:1159
#6 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#7 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7f085f58b700 (LWP 25696)):
#0 0x00007f0860c5c7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085f58f4d6 in logger_thead_main (arg=0x12a2040) at extensions/loggers/file_logger.c:368
#2 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#3 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7f0857af6700 (LWP 25705)):
#0 0x00007f0860c5c7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085b4e500e in wait (this=0x5bba680) at src/syncobject.hh:57
#2 ExecutorThread::run (this=0x5bba680) at src/scheduler.cc:140
#3 0x00007f085b4e57dd in launch_executor_thread (arg=0x5bba680) at src/scheduler.cc:34
#4 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#5 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7f0853ef0700 (LWP 25711)):
#0 0x00007f0860c5f054 in __lll_lock_wait () from /lib64/libpthread.so.0
#1 0x00007f0860c5a388 in _L_lock_854 () from /lib64/libpthread.so.0
#2 0x00007f0860c5a257 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3 0x00007f085b4e2a5a in Mutex::acquire (this=0x5bb8008) at src/mutex.cc:79
#4 0x00007f085b4e32a5 in lock (this=0x5bb8000, taskId=17, tosleep=1) at src/locks.hh:48
#5 LockHolder (this=0x5bb8000, taskId=17, tosleep=1) at src/locks.hh:26
#6 ExecutorPool::snooze (this=0x5bb8000, taskId=17, tosleep=1) at src/scheduler.cc:230
#7 0x00007f085b49920a in BgFetcher::run (this=<value optimized out>, tid=<value optimized out>) at src/bgfetcher.cc:129
#8 0x00007f085b4e5139 in ExecutorThread::run (this=0x64f2b60) at src/scheduler.cc:150
#9 0x00007f085b4e57dd in launch_executor_thread (arg=0x64f2b60) at src/scheduler.cc:34
#10 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#11 0x00007f08609a690d in clone () from /lib64/libc.so.6

--Type <return> to continue, or q <return> to quit--
Thread 9 (Thread 0x7f08552f2700 (LWP 25709)):
#0 0x00007f0860c5f054 in __lll_lock_wait () from /lib64/libpthread.so.0
#1 0x00007f0860c5a388 in _L_lock_854 () from /lib64/libpthread.so.0
#2 0x00007f0860c5a257 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3 0x00007f085b4e2a5a in Mutex::acquire (this=0x5bb8008) at src/mutex.cc:79
#4 0x00007f085b4e338e in lock (this=0x5bb8000, taskId=12) at src/locks.hh:48
#5 LockHolder (this=0x5bb8000, taskId=12) at src/locks.hh:26
#6 ExecutorPool::cancel (this=0x5bb8000, taskId=12) at src/scheduler.cc:208
#7 0x00007f085b4da10c in Flusher::transition_state (this=0x12ada40, to=<value optimized out>) at src/flusher.cc:101
#8 0x00007f085b4dafea in initialize (this=0x12ada40, tid=12) at src/flusher.cc:117
#9 Flusher::step (this=0x12ada40, tid=12) at src/flusher.cc:143
#10 0x00007f085b4e5139 in ExecutorThread::run (this=0x64f2ea0) at src/scheduler.cc:150
#11 0x00007f085b4e57dd in launch_executor_thread (arg=0x64f2ea0) at src/scheduler.cc:34
#12 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7f085e97e700 (LWP 25697)):
#0 0x00007f08609a6f03 in epoll_wait () from /lib64/libc.so.6
#1 0x00007f086175a576 in epoll_dispatch (base=0x5b0a500, tv=<value optimized out>) at epoll.c:404
#2 0x00007f0861745e44 in event_base_loop (base=0x5b0a500, flags=<value optimized out>) at event.c:1558
#3 0x0000000000414604 in worker_libevent (arg=0x12a5900) at daemon/thread.c:301
#4 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#5 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7f08584f7700 (LWP 25704)):
#0 0x00007f0860c5c7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085b4e500e in wait (this=0x5bba820) at src/syncobject.hh:57
#2 ExecutorThread::run (this=0x5bba820) at src/scheduler.cc:140
#3 0x00007f085b4e57dd in launch_executor_thread (arg=0x5bba820) at src/scheduler.cc:34
#4 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#5 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7f08570f5700 (LWP 25706)):
#0 0x00007f0860c5c7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085b4c157f in wait (this=0x5b62000) at src/syncobject.hh:57
#2 wait (this=0x5b62000) at src/syncobject.hh:73
#3 wait (this=0x5b62000) at src/tapconnmap.hh:169
#4 EventuallyPersistentEngine::notifyPendingConnections (this=0x5b62000) at src/ep_engine.cc:3388
#5 0x00007f085b4c1663 in EvpNotifyPendingConns (arg=0x5b62000) at src/ep_engine.cc:1159
#6 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#7 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f0855cf3700 (LWP 25708)):
#0 0x00007f0860c5c7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085b4a4be8 in wait (this=0x5b562d0, d=...) at src/syncobject.hh:57
#2 IdleTask::run (this=0x5b562d0, d=...) at src/dispatcher.cc:342
#3 0x00007f085b4a774a in Dispatcher::run (this=0x5b54a80) at src/dispatcher.cc:184
#4 0x00007f085b4a7f0d in launch_dispatcher_thread (arg=<value optimized out>) at src/dispatcher.cc:28
#5 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#6 0x00007f08609a690d in clone () from /lib64/libc.so.6

--Type <return> to continue, or q <return> to quit--
Thread 4 (Thread 0x7f08598f9700 (LWP 25702)):
#0 0x00007f086096ab8d in nanosleep () from /lib64/libc.so.6
#1 0x00007f086099fd64 in usleep () from /lib64/libc.so.6
#2 0x00007f085b4e1b65 in updateStatsThread (arg=0x12a24c0) at src/memory_tracker.cc:31
#3 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#4 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f08566f4700 (LWP 25707)):
#0 0x00007f0860c5c7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007f085b4a4be8 in wait (this=0x5b56090, d=...) at src/syncobject.hh:57
#2 IdleTask::run (this=0x5b56090, d=...) at src/dispatcher.cc:342
#3 0x00007f085b4a774a in Dispatcher::run (this=0x5b54c40) at src/dispatcher.cc:184
#4 0x00007f085b4a7f0d in launch_dispatcher_thread (arg=<value optimized out>) at src/dispatcher.cc:28
#5 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#6 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f085c17a700 (LWP 25701)):
#0 0x00007f08609a6f03 in epoll_wait () from /lib64/libc.so.6
#1 0x00007f086175a576 in epoll_dispatch (base=0x5b0a780, tv=<value optimized out>) at epoll.c:404
#2 0x00007f0861745e44 in event_base_loop (base=0x5b0a780, flags=<value optimized out>) at event.c:1558
#3 0x0000000000414604 in worker_libevent (arg=0x12a5ce0) at daemon/thread.c:301
#4 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#5 0x00007f08609a690d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f085cb7b700 (LWP 25700)):
#0 ExecutorThread::schedule (this=0x0, task=...) at src/scheduler.cc:179
#1 0x00007f085b4e3c76 in ExecutorPool::schedule (this=0x5bb8000, task=..., tidx=<value optimized out>) at src/scheduler.cc:248
#2 0x00007f085b4dd537 in IOManager::scheduleMultiBGFetcher (this=0x5bb8000, engine=<value optimized out>, b=<value optimized out>, priority=..., sid=<value optimized out>,
sleeptime=<value optimized out>, isDaemon=false, blockShutdown=false) at src/iomanager/iomanager.cc:89
#3 0x00007f085b49870f in BgFetcher::start (this=0x62fbe00) at src/bgfetcher.cc:15
#4 0x00007f085b4adb44 in startBgFetcher (this=0x5b74c00) at src/ep.cc:454
#5 EventuallyPersistentStore::initialize (this=0x5b74c00) at src/ep.cc:307
#6 0x00007f085b4c1bf0 in EventuallyPersistentEngine::initialize (this=0x5b62900, config=<value optimized out>) at src/ep_engine.cc:1382
#7 0x00007f085b4c1e96 in EvpInitialize (handle=0x5b62900,
config_str=0x7f085cb7aa53 "ht_size=3079;ht_locks=5;tap_noop_interval=20;max_txn_size=10000;max_size=5242880000;tap_keepalive=300;dbname=/data/default;allow_data_loss_during_shutdown=true;backend=couchdb;couch_bucket=default;cou"...) at src/ep_engine.cc:125
#8 0x00007f085e9826f3 in create_bucket_UNLOCKED (e=0x7f085eb8a660, bucket_name=0x7f085cb7abd0 "default", path=0x7f085cb7aa30 "/opt/couchbase/lib/memcached/ep.so",
config=0x7f085cb7aa53 "ht_size=3079;ht_locks=5;tap_noop_interval=20;max_txn_size=10000;max_size=5242880000;tap_keepalive=300;dbname=/data/default;allow_data_loss_during_shutdown=true;backend=couchdb;couch_bucket=default;cou"..., e_out=0x0, msg=0x7f085cb7a620 "", msglen=1024) at bucket_engine.c:706
#9 0x00007f085e98290c in handle_create_bucket (handle=0x7f085eb8a660, cookie=0x5aac840, request=<value optimized out>, response=0x4075e0 <binary_response_handler>)
at bucket_engine.c:2144
#10 0x00007f085e983f19 in bucket_unknown_command (handle=0x7f085eb8a660, cookie=0x5aac840, request=0x5ac3000, response=0x4075e0 <binary_response_handler>)
at bucket_engine.c:2454
#11 0x0000000000411b4e in process_bin_unknown_packet (c=0x5aac840) at daemon/memcached.c:2882
#12 process_bin_packet (c=0x5aac840) at daemon/memcached.c:3170
#13 complete_nread_binary (c=0x5aac840) at daemon/memcached.c:3744
#14 complete_nread (c=0x5aac840) at daemon/memcached.c:3826
#15 conn_nread (c=0x5aac840) at daemon/memcached.c:5679
#16 0x0000000000405ec5 in event_handler (fd=<value optimized out>, which=<value optimized out>, arg=0x5aac840) at daemon/memcached.c:5942
#17 0x00007f0861745f3c in event_process_active_single_queue (base=0x5b0aa00, flags=<value optimized out>) at event.c:1308
#18 event_process_active (base=0x5b0aa00, flags=<value optimized out>) at event.c:1375
--Type <return> to continue, or q <return> to quit--
#19 event_base_loop (base=0x5b0aa00, flags=<value optimized out>) at event.c:1572
#20 0x0000000000414604 in worker_libevent (arg=0x12a5be8) at daemon/thread.c:301
#21 0x00007f0860c58851 in start_thread () from /lib64/libpthread.so.0
#22 0x00007f08609a690d in clone () from /lib64/libc.so.6