14:17:26 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.
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.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=5
max_threads=151
thread_count=1
connection_count=1
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7f40a407fd80
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 = 7f4100085e70 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f419d8a1390]
/usr/sbin/mysqld[0xc1b708]
/usr/sbin/mysqld(_Z21join_read_const_tableP8JOIN_TABP11st_position+0x243)[0xc1f573]
/usr/sbin/mysqld(_ZN4JOIN29extract_func_dependent_tablesEv+0x3e7)[0xc3cdb7]
/usr/sbin/mysqld(_ZN4JOIN14make_join_planEv+0x102a)[0xc4472a]
/usr/sbin/mysqld(_ZN4JOIN8optimizeEv+0x709)[0xc45849]
/usr/sbin/mysqld(_ZN13st_select_lex8optimizeEP3THD+0x682)[0xc8dcb2]
/usr/sbin/mysqld(_Z12handle_queryP3THDP3LEXP12Query_resultyy+0x20c)[0xc8df2c]
/usr/sbin/mysqld[0x750b34]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THDb+0x492e)[0xc5004e]
/usr/sbin/mysqld(_Z11mysql_parseP3THDP12Parser_state+0x3ad)[0xc524ad]
/usr/sbin/mysqld(_Z16dispatch_commandP3THDPK8COM_DATA19enum_server_command+0x102a)[0xc535ea]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x1c7)[0xc54aa7]
/usr/sbin/mysqld(handle_connection+0x288)[0xd15bc8]
/usr/sbin/mysqld(pfs_spawn_thread+0x1b4)[0x11bc964]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba)[0x7f419d8976ba]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f419cd2c41d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f40a4011cc0): is an invalid pointer
Connection ID (thread ID): 423
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.