spider/bg.ha, spider/bg.ha_part crash server sporadically in buildbot

spider/bg.ha                             w3 [ fail ]

        Test ended at 2015-04-04 02:59:26

CURRENT_TEST: spider/bg.ha

The server [mysqld.3.2 - pid: 5373, winpid: 5373, exit: 256] crashed while running 'check warnings'

Server log from this test:

----------SERVER LOG START-----------

150404  2:59:25 [ERROR] 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.

To report this bug, see http://kb.askmonty.org/en/reporting-bugs

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.

Server version: 10.1.4-MariaDB-1~precise-wsrep-log

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=2

max_threads=153

thread_count=2

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 61901 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0xaea8e008

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...

----------SERVER LOG END-------------

mysqltest failed but provided no output

The result from queries just before the failure was:

< snip >

for master_1

for child2

child2_1

child2_2

child2_3

for child3

child3_1

child3_2

child3_3

for master_1

for child2

child2_1

child2_2

child2_3

for child3

child3_1

child3_2

child3_3

end of test

 - saving '/run/shm/var/3/log/spider/bg.ha/' to '/run/shm/var/log/bg.ha/'