Comment 0 for bug 1381915

Hi,

I have 2+1 nodes Percona Cluster (2 worker nodes +garbd ).

mysql> show variables like "%version%"; +-------------------------+---------------------------------------------------------------------------------------------------+
| Variable_name | Value |
+-------------------------+---------------------------------------------------------------------------------------------------+
| innodb_version | 5.6.20-68.0 |
| protocol_version | 10 |
| slave_type_conversions | |
| version | 5.6.20-68.0-56 |
| version_comment | Percona XtraDB Cluster (GPL), Release rel68.0, Revision 888, WSREP version 25.7, wsrep_25.7.r4126 |
| version_compile_machine | x86_64 |
| version_compile_os | Linux |
+-------------------------+---------------------------------------------------------------------------------------------------+

wsrep_provider_name Galera
wsrep_provider_vendor Codership Oy <email address hidden>
wsrep_provider_version 3.7(r7f44a18)

Yesterday suddenly one node crashed with the following error:

13:45:01 UTC - mysqld got signal 11 ;
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.
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=60
max_threads=153
thread_count=33
connection_count=31
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 69257 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x2db48d0
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 = 7fa721437d38 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x35)[0x8f5835]
/usr/sbin/mysqld(handle_fatal_signal+0x4b4)[0x664384]
/lib64/libpthread.so.0(+0xf710)[0x7fa781d67710]
[0x7fa6e40000c8]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7fa6e4004c10): is an invalid pointer
Connection ID (thread ID): 3432
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.
141015 15:45:01 mysqld_safe Number of processes running now: 0
141015 15:45:01 mysqld_safe WSREP: not restarting wsrep node automatically
141015 15:45:01 mysqld_safe mysqld from pid file /var/lib/mysql/mysql02_cluster.pkw.de.pid ended

IST was successful only after deleting galera.cache and grastate.dat.

Please let me know if you need some other information.