MariaDB crashes every other day

Nov 10 16:16:27 uhu1 mysqld[28271]: 161110 16:16:27 [ERROR] mysqld got signal 11 ;

Nov 10 16:16:27 uhu1 mysqld[28271]: This could be because you hit a bug. It is also possible that this binary

Nov 10 16:16:27 uhu1 mysqld[28271]: or one of the libraries it was linked against is corrupt, improperly built,

Nov 10 16:16:27 uhu1 mysqld[28271]: or misconfigured. This error can also be caused by malfunctioning hardware.

Nov 10 16:16:27 uhu1 mysqld[28271]: To report this bug, see https://mariadb.com/kb/en/reporting-bugs

Nov 10 16:16:27 uhu1 mysqld[28271]: We will try our best to scrape up some info that will hopefully help

Nov 10 16:16:27 uhu1 mysqld[28271]: diagnose the problem, but since we have already crashed,

Nov 10 16:16:27 uhu1 mysqld[28271]: something is definitely wrong and this may fail.

Nov 10 16:16:27 uhu1 mysqld[28271]: Server version: 10.2.2-MariaDB-1~xenial-log

Nov 10 16:16:27 uhu1 mysqld[28271]: key_buffer_size=134217728

Nov 10 16:16:27 uhu1 mysqld[28271]: read_buffer_size=2097152

Nov 10 16:16:27 uhu1 mysqld[28271]: max_used_connections=31

Nov 10 16:16:27 uhu1 mysqld[28271]: max_threads=302

Nov 10 16:16:27 uhu1 mysqld[28271]: thread_count=35

Nov 10 16:16:27 uhu1 mysqld[28271]: It is possible that mysqld could use up to

Nov 10 16:16:27 uhu1 mysqld[28271]: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1992885 K  bytes of memory

Nov 10 16:16:27 uhu1 mysqld[28271]: Hope that's ok; if not, decrease some variables in the equation.

Nov 10 16:16:27 uhu1 mysqld[28271]: Thread pointer: 0x0x7f7303c58008

Nov 10 16:16:27 uhu1 mysqld[28271]: Attempting backtrace. You can use the following information to find out

Nov 10 16:16:27 uhu1 mysqld[28271]: where mysqld died. If you see no messages after this, something went

Nov 10 16:16:27 uhu1 mysqld[28271]: terribly wrong...

Nov 10 16:16:27 uhu1 mysqld[28271]: stack_bottom = 0x7f73431d58f8 thread_stack 0x48c00

Nov 10 16:16:27 uhu1 mysqld[28271]: /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x56365fe2c77e]

Nov 10 16:16:27 uhu1 mysqld[28271]: /usr/sbin/mysqld(handle_fatal_signal+0x2dd)[0x56365f88372d]

Nov 10 16:16:27 uhu1 mysqld[28271]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x113e0)[0x7f734f6a43e0]

Nov 10 16:16:27 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z20ha_abort_transactionP3THDS0_c+0xa3)[0x56365f88db03]

Nov 10 16:16:27 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z15wsrep_abort_thdPvS_c+0x13c)[0x56365f82d66c]

Nov 10 16:16:27 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z25wsrep_grant_mdl_exceptionP11MDL_contextP10MDL_ticketPK7MDL_key+0x460)[0x56365f81da90]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_ZNK8MDL_lock14can_grant_lockE13enum_mdl_typeP11MDL_contextb+0x296)[0x56365f7c4ed6]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_ZN11MDL_context21try_acquire_lock_implEP11MDL_requestPP10MDL_ticket+0xe1)[0x56365f7c5aa1]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_ZN11MDL_context12acquire_lockEP11MDL_requestd+0x2e)[0x56365f7c615e]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_ZN11MDL_context13acquire_locksEP8I_P_ListI11MDL_request16I_P_List_adapterIS1_XadL_ZNS1_12next_in_listEEEXadL_ZNS1_12prev_in_listEEEE16I_P_List_counter21I_P_List_no_push_backIS1_EEd+0xdd)[0x56365f7c6cdd]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z16lock_table_namesP3THDRK14DDL_options_stP10TABLE_LISTS5_mj+0x258)[0x56365f6aaeb8]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_ZN22Sql_cmd_truncate_table10lock_tableEP3THDP10TABLE_LISTPb+0x13a)[0x56365f9cd15a]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_ZN22Sql_cmd_truncate_table14truncate_tableEP3THDP10TABLE_LIST+0x73)[0x56365f9cd273]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_ZN22Sql_cmd_truncate_table7executeEP3THD+0x50)[0x56365f9cd480]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1316)[0x56365f6ef746]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x28a)[0x56365f6f72ea]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(+0x47eac7)[0x56365f6f7ac7]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x11d1)[0x56365f6f92b1]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z10do_commandP3THD+0x17c)[0x56365f6fa89c]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(_Z24do_handle_one_connectionP7CONNECT+0x24a)[0x56365f7bc30a]

Nov 10 16:16:28 uhu1 mysqld[28271]: /usr/sbin/mysqld(handle_one_connection+0x3d)[0x56365f7bc49d]

Nov 10 16:16:28 uhu1 mysqld[28271]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x770a)[0x7f734f69a70a]

Nov 10 16:16:28 uhu1 mysqld[28271]: /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f734ed4582d]

Nov 10 16:16:28 uhu1 mysqld[28271]: Trying to get some variables.

Nov 10 16:16:28 uhu1 mysqld[28271]: Some pointers may be invalid and cause the dump to abort.

Nov 10 16:16:28 uhu1 mysqld[28271]: Query (0x7f7303e19020): TRUNCATE cache_render

Nov 10 16:16:28 uhu1 mysqld[28271]: Connection ID (thread ID): 136386

Nov 10 16:16:28 uhu1 mysqld[28271]: Status: NOT_KILLED

Nov 10 16:16:28 uhu1 mysqld[28271]: 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=on,condition_pushdown_for_derived=on

Nov 10 16:16:28 uhu1 mysqld[28271]: The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

Nov 10 16:16:28 uhu1 mysqld[28271]: information that should help you find out what is causing the crash.