Server version: 5.5.38-MariaDB-1~precise-log
key_buffer_size=3221225470
read_buffer_size=8388608
max_used_connections=77
max_threads=122
thread_count=73
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 7270511 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x7f31e15f1000
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 = 0x7f30f63fee20 thread_stack 0xc8000
/usr/sbin/mysqld(my_print_stacktrace+0x2b)[0xa7499b]
/usr/sbin/mysqld(handle_fatal_signal+0x398)[0x6ccf88]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0)[0x7f399f14fcb0]
/lib/x86_64-linux-gnu/libc.so.6(_IO_vfprintf+0x29f1)[0x7f399d93a3b1]
/lib/x86_64-linux-gnu/libc.so.6(__fprintf_chk+0xeb)[0x7f399d9f880b]
/usr/sbin/mysqld[0x846dcc]
/usr/sbin/mysqld[0x847fda]
/usr/sbin/mysqld[0x849778]
/usr/sbin/mysqld[0x83ec6f]
/usr/sbin/mysqld[0x8095bc]
/usr/sbin/mysqld(_Z14ha_show_statusP3THDP10handlerton12ha_stat_type+0x217)[0x6d4017]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x3f13)[0x59fcc3]
/usr/sbin/mysqld[0x5a1934]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x159f)[0x5a301f]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x1fb)[0x65323b]
/usr/sbin/mysqld(handle_one_connection+0x4c)[0x6532bc]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a)[0x7f399f147e9a]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f399d9e33fd]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7f3171026018): SHOW /*!50000 ENGINE*/ INNODB STATUS
Connection ID (thread ID): 141550
Status: NOT_KILLED

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off

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.
Writing a core file