Invalid read of size 4 in DCP Rollback task

==13612== Memcheck, a memory error detector

==13612== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.

==13612== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info

==13612== Command: /home/couchbase/couchbase/build/memcached/engine_testapp -E ep.so -T ./ep_testsuite.so -e flushall_enabled=true;ht_size=13;ht_locks=7 -C 288

==13612== Parent PID: 7027

==13612== 

==13612== Thread 10 mc:writer_7:

==13612== Invalid read of size 4

==13612==    at 0x54A7E84: pthread_mutex_lock (pthread_mutex_lock.c:50)

==13612==    by 0x50417F5: cb_mutex_enter (cb_pthreads.c:115)

==13612==    by 0x7D765BC: Mutex::acquire() (mutex.cc:31)

==13612==    by 0x7D0B278: lock (locks.h:70)

==13612==    by 0x7D0B278: LockHolder (locks.h:47)

==13612==    by 0x7D0B278: doRollback (consumer.cc:633)

==13612==    by 0x7D0B278: RollbackTask::run() (consumer.cc:545)

==13612==    by 0x7D77053: ExecutorThread::run() (executorthread.cc:124)

==13612==    by 0x7D776A8: launch_executor_thread (executorthread.cc:34)

==13612==    by 0x50417B7: platform_thread_wrap (cb_pthreads.c:23)

==13612==    by 0x54A5E99: start_thread (pthread_create.c:308)

==13612==    by 0x5D4238C: clone (clone.S:112)

==13612==  Address 0x14898928 is 296 bytes inside a block of size 512 free'd

==13612==    at 0x52908C8: je_valgrind_freelike_block (valgrind.c:33)

==13612==    by 0x7D907C7: DcpConnMap::manageConnections() (connmap.cc:1118)

==13612==    by 0x7D941CD: ConnManager::run() (connmap.cc:152)

==13612==    by 0x7D77053: ExecutorThread::run() (executorthread.cc:124)

==13612==    by 0x7D776A8: launch_executor_thread (executorthread.cc:34)

==13612==    by 0x50417B7: platform_thread_wrap (cb_pthreads.c:23)

==13612==    by 0x54A5E99: start_thread (pthread_create.c:308)

==13612==    by 0x5D4238C: clone (clone.S:112)

...

<cut> many more follow

...

Running [0288/0330]: test rollback to zero on consumer (couchstore)...FATAL: Failed to lock mutex: 22 Invalid argument(7 sec) DIED