Couple of days ago, a different node crashed: 

08:49:21 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=1263
max_threads=4002
thread_count=35
connection_count=2
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1602318 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x3a6f0770
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 = 7fc69734cd38 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x35)[0x900aa5]
/usr/sbin/mysqld(handle_fatal_signal+0x4b4)[0x667e04]
/lib64/libpthread.so.0(+0xf790)[0x7fd379669790]
/usr/sbin/mysqld(_ZN10MDL_ticket7destroyEPS_+0xc)[0x6574bc]
/usr/sbin/mysqld(_Z17mysql_ull_cleanupP3THD+0x49)[0x5fd779]
/usr/sbin/mysqld(_ZN3THD7cleanupEv+0xd0)[0x6b8420]
/usr/sbin/mysqld(_ZN3THD17release_resourcesEv+0x298)[0x6b8ff8]
/usr/sbin/mysqld(_Z29one_thread_per_connection_endP3THDb+0x2e)[0x58551e]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x101)[0x6bf011]
/usr/sbin/mysqld(handle_one_connection+0x47)[0x6bf277]
/usr/sbin/mysqld(pfs_spawn_thread+0x12a)[0xafd66a]
/lib64/libpthread.so.0(+0x7a51)[0x7fd379661a51]
/lib64/libc.so.6(clone+0x6d)[0x7fd377b6593d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0): is an invalid pointer
Connection ID (thread ID): 153707045
Status: KILL_CONNECTION

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.
160225 12:49:21 mysqld_safe Number of processes running now: 0
160225 12:49:21 mysqld_safe WSREP: not restarting wsrep node automatically
160225 12:49:21 mysqld_safe mysqld from pid file /var/lib/mysql/pxc-02.pid ended
160225 13:06:46 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
160225 13:06:46 mysqld_safe WSREP: Running position recovery with --log_error='/var/lib/mysql/wsrep_recovery.W41Rgz' --pid-file='/var/lib/mysql/pxc-02-recover.pid'
2016-02-25 13:06:47 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-02-25 13:06:47 0 [Note] /usr/sbin/mysqld (mysqld 5.6.26-74.0-56-log) starting as process 66423 ...
160225 13:06:55 mysqld_safe WSREP: Recovered position 8a89896c-a304-11e5-bed2-1e4a9bc0b937:16497980
Log of wsrep recovery (--wsrep-recover):


This time there was no error segfault in dmesg/message log.

In addition to the log excerpt, I've attached the MySQL configuration file.