error.log

2016-11-15T13:21:26.102493Z 0 [Note] InnoDB: Buffer pool(s) load completed at 161115 16:21:26
13:26:06 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.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.
Please help us make Percona XtraDB Cluster better by reporting any
bugs at https://bugs.launchpad.net/percona-xtradb-cluster

key_buffer_size=8388608
read_buffer_size=131072
max_used_connections=3
max_threads=301
thread_count=19
connection_count=1
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 127787 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7f26dc000ae0
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 = 7f2758052a30 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x2c)[0xef9fbc]
/usr/sbin/mysqld(handle_fatal_signal+0x461)[0x7a9601]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x10330)[0x7f28ff7d0330]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37)[0x7f28fec11c37]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x148)[0x7f28fec15028]
/lib/x86_64-linux-gnu/libc.so.6(+0x732a4)[0x7f28fec4e2a4]
/lib/x86_64-linux-gnu/libc.so.6(+0x7dff7)[0x7f28fec58ff7]
/usr/lib/mysql/plugin/audit_log.so(+0x482e)[0x7f275919f82e]
/usr/sbin/mysqld(_ZN17sys_var_pluginvar13global_updateEP3THDP7set_var+0x59)[0xcf8eb9]
/usr/sbin/mysqld(_ZN7sys_var6updateEP3THDP7set_var+0x1ed)[0xc4187d]
/usr/sbin/mysqld(_ZN7set_var6updateEP3THD+0x17)[0xc41ef7]
/usr/sbin/mysqld(_Z17sql_set_variablesP3THDP4ListI12set_var_baseE+0x71)[0xc42ac1]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THDb+0x5613)[0xcd2583]
/usr/sbin/mysqld(_Z11mysql_parseP3THDP12Parser_state+0x645)[0xcd46e5]
/usr/sbin/mysqld[0xcd4813]
/usr/sbin/mysqld(_Z16dispatch_commandP3THDPK8COM_DATA19enum_server_command+0xd50)[0xcd5f10]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x192)[0xcd7bd2]
/usr/sbin/mysqld(handle_connection+0x368)[0xd9c748]
/usr/sbin/mysqld(pfs_spawn_thread+0x1b4)[0x12719d4]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x8184)[0x7f28ff7c8184]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f28fecd537d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f26dc0059d0): is an invalid pointer
Connection ID (thread ID): 147
Status: NOT_KILLED

You may download the Percona XtraDB Cluster operations manual by visiting
http://www.percona.com/software/percona-xtradb-cluster/. You may find information
in the manual which will help you identify the cause of the crash.
2016-11-15T13:26:06.389173Z mysqld_safe Number of processes running now: 0
2016-11-15T13:26:06.390046Z mysqld_safe WSREP: not restarting wsrep node automatically
2016-11-15T13:26:06.391474Z mysqld_safe mysqld from pid file /var/lib/mysql/data/db4-ire1.pid ended