Able to confirm this with codership-5.6 latest HEAD build as well. mysqld: /media/Tintin/Work/code/codership/codership-5.6/sql/transaction.cc:42: bool trans_check_state(THD*): Assertion `thd->transaction.stmt.is_empty()' failed. 13:15:56 UTC - mysqld got signal 6 ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. key_buffer_size=8388608 read_buffer_size=131072 max_used_connections=3 max_threads=151 thread_count=3 connection_count=3 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 68310 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x7f81200009a0 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... stack_bottom = 7f8145db2ae8 thread_stack 0x40000 /chip/bin/mysqld(my_print_stacktrace+0x2c)[0x946e9a] /chip/bin/mysqld(handle_fatal_signal+0x2f7)[0x67f607] /usr/lib/libpthread.so.0(+0xf870)[0x7f8145b0b870] /usr/lib/libc.so.6(gsignal+0x39)[0x7f81440a13d9] /usr/lib/libc.so.6(abort+0x148)[0x7f81440a27d8] /usr/lib/libc.so.6(+0x2e506)[0x7f814409a506] /usr/lib/libc.so.6(+0x2e5b2)[0x7f814409a5b2] /chip/bin/mysqld(_Z17trans_check_stateP3THD+0x5a)[0x7ab77a] /chip/bin/mysqld(_Z14trans_rollbackP3THD+0x29e)[0x7ac53f] /chip/bin/mysqld(_Z15wsrep_commit_cbPvPK14wsrep_trx_metaPbb+0x184)[0x5b0e4e] /pxc56/lib/libgalera_smm.so(+0x1b4d5d)[0x7f81435f3d5d] /pxc56/lib/libgalera_smm.so(_ZN6galera13ReplicatorSMM9apply_trxEPvPNS_9TrxHandleE+0xb0)[0x7f81435f69b0] /pxc56/lib/libgalera_smm.so(_ZN6galera13ReplicatorSMM11process_trxEPvPNS_9TrxHandleE+0x10e)[0x7f81435f8efe] /pxc56/lib/libgalera_smm.so(_ZN6galera15GcsActionSource8dispatchEPvRK10gcs_actionRb+0x1b9)[0x7f81435d7a19] /pxc56/lib/libgalera_smm.so(_ZN6galera15GcsActionSource7processEPvRb+0x4c)[0x7f81435d890c] /pxc56/lib/libgalera_smm.so(_ZN6galera13ReplicatorSMM10async_recvEPv+0x6b)[0x7f81435f911b] /pxc56/lib/libgalera_smm.so(galera_recv+0x18)[0x7f8143609c68] /chip/bin/mysqld[0x5b1188] /chip/bin/mysqld(start_wsrep_THD+0x5c2)[0x598a3f] /usr/lib/libpthread.so.0(+0x80a2)[0x7f8145b040a2] /usr/lib/libc.so.6(clone+0x6d)[0x7f814415143d] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (0): Connection ID (thread ID): 2 Status: NOT_KILLED The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains information that should help you find out what is causing the crash. Writing a core file ================================================== It crashes quite rapidly after start of test (with both PXC and codership binaries) - http://paste.wnohang.net/cdd43e perl runall-new.pl --basedir=/chip --galera=ms --mysqld=--skip-performance-schema --reporter=Shutdown,Backtrace,ErrorLog,ErrorLogAlarm,Deadlock --grammar=conf/galera/galera_stress-56.yy --gendata=conf/galera/galera_stress-56.zz --threads=16 --queries=50000 --mysqld=--wsrep-provider=/pxc56/lib/libgalera_smm.so --seed=time --mysqld=--innodb_flush_method=O_DIRECT --mem The grammars/scripts used are from bzr+ssh://bazaar.launchpad.net/~raghavendra-prabhu/randgen/pxc/