171213  5:33:55 [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 https://mariadb.com/kb/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: 10.1.28-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=82
max_threads=153
thread_count=28
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467072 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x821fe5008
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 = 0x7ffffc6ad348 thread_stack 0x48400
0x19972e9 <my_print_stacktrace+0x29> at /usr/local/libexec/mysqld
0x158aab5 <handle_fatal_signal+0x2f5> at /usr/local/libexec/mysqld
0x7fffffdfe003 <???> at ???

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x8130cc020): is an invalid pointer
Connection ID (thread ID): 995849
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_ta
ble_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=on,exists_to_in=on,orderby_uses_equalities=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.

We think the query pointer is invalid, but we will try to print it anyway. 
Query: SELECT * FROM KEY_COLUMN_USAGE LIMIT 1

171213 05:34:13 mysqld_safe mysqld restarted