MariaDB 10.1.21 server sudden crash

2017-09-06 14:50:21 140465624627968 [Note] WSREP: cluster conflict due to high priority abort for threads:

2017-09-06 14:50:21 140465624627968 [Note] WSREP: Winning thread: 

   THD: 25160306, mode: total order, state: executing, conflict: no conflict, seqno: 1598878419

   SQL: ALTER TABLE `catalog_product_index_price` ENABLE KEYS

2017-09-06 14:50:21 140465624627968 [Note] WSREP: Victim thread: 

   THD: 25160307, mode: local, state: executing, conflict: no conflict, seqno: -1

   SQL: SELECT GET_LOCK('magentodev19.index_process_18', '5')

2017-09-06 14:50:21 140465624627968 [Note] WSREP: MDL conflict db=magentodev19 table=catalog_product_index_price ticket=4 solved by abort

170906 14:50:21 [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: 10.1.21-MariaDB

key_buffer_size=33554432

read_buffer_size=131072

max_used_connections=469

max_threads=1026

thread_count=409

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 2286396 K  bytes of memory

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

Thread pointer: 0x7faa805c5008

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 = 0x7faa76b20080 thread_stack 0x48400

(my_addr_resolve failure: fork)

/usr/sbin/mysqld(my_print_stacktrace+0x2e) [0x7fc8e12309ce]

/usr/sbin/mysqld(handle_fatal_signal+0x305) [0x7fc8e0d56355]

/lib64/libpthread.so.0(+0xf370) [0x7fc8e0372370]

/usr/sbin/mysqld(MDL_lock::Ticket_list::remove_ticket(MDL_ticket*)+0x11) [0x7fc8e0cac3c1]

/usr/sbin/mysqld(MDL_lock::remove_ticket(LF_PINS*, MDL_lock::Ticket_list MDL_lock::*, MDL_ticket*)+0x8c) [0x7fc8e0cacedc]

/usr/sbin/mysqld(MDL_context::release_lock(enum_mdl_duration, MDL_ticket*)+0x24) [0x7fc8e0cadf34]

/usr/sbin/mysqld(MDL_context::release_locks_stored_before(enum_mdl_duration, MDL_ticket*)+0x35) [0x7fc8e0cadfb5]

/usr/sbin/mysqld(mysql_execute_command(THD*)+0xaed) [0x7fc8e0bd10fd]

/usr/sbin/mysqld(mysql_parse(THD*, char*, unsigned int, Parser_state*)+0x332) [0x7fc8e0bd9a02]

/usr/sbin/mysqld(+0x439229) [0x7fc8e0bda229]

/usr/sbin/mysqld(dispatch_command(enum_server_command, THD*, char*, unsigned int)+0x1f5a) [0x7fc8e0bdc83a]

/usr/sbin/mysqld(do_command(THD*)+0x14a) [0x7fc8e0bdd6aa]

/usr/sbin/mysqld(do_handle_one_connection(THD*)+0x18a) [0x7fc8e0ca485a]

/usr/sbin/mysqld(handle_one_connection+0x40) [0x7fc8e0ca4a00]

/usr/sbin/mysqld(+0x96d05d) [0x7fc8e110e05d]

/lib64/libpthread.so.0(+0x7dc5) [0x7fc8e036adc5]

/lib64/libc.so.6(clone+0x6d) [0x7fc8de78973d]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x7faa0b3bc020): INSERT INTO MCHECKPOINT (CP_MCHAIN_ID,CP_SHOP_ID,CP_SYSTEM,CP_ACTION,CP_SUBACTION,CP_LASTCHECKED,CP_LASTSUCCESS,CP_LASTALERTED,CP_LASTSWEEPED,ETS,UTS) VALUES (53,'Chain','DT','Export','CustArtSystemLst','20170906145021',' ',' ',' ', '20170906145021648', '20170906145021648')

Connection ID (thread ID): 25160372

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=on,exists_to_in=on,orderby_uses_equalities=off