Hi, Last night one of my servers updated MariaDB to 10.1.15 and it started to crash every few minutes since the update ( from 10.1.14 -> 10.1.15 ). ------------ 160702 10:22:13 [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: 10.1.15-MariaDB key_buffer_size=268435456 read_buffer_size=524288 max_used_connections=8 max_threads=1001 thread_count=4 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1804821 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x0x7f5a89876008 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 = 0x7f5ab5dd9058 thread_stack 0x48400 /usr/sbin/mysqld(my_print_stacktrace+0x2b)[0x7f5c9736641b] /usr/sbin/mysqld(handle_fatal_signal+0x475)[0x7f5c96ec29f5] /lib64/libpthread.so.0(+0xf7e0)[0x7f5c964c77e0] /usr/sbin/mysqld(_ZN10SQL_SELECT17test_quick_selectEP3THD6BitmapILj64EEyybbb+0x1fe5)[0x7f5c96fae535] /usr/sbin/mysqld(+0x49bb90)[0x7f5c96d92b90] /usr/sbin/mysqld(_ZN4JOIN14optimize_innerEv+0x1e2e)[0x7f5c96da1e9e] /usr/sbin/mysqld(_ZN4JOIN8optimizeEv+0x20)[0x7f5c96da2fe0] /usr/sbin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x9d)[0x7f5c96da313d] /usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x25d)[0x7f5c96da6add] /usr/sbin/mysqld(+0x451d52)[0x7f5c96d48d52] /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x5d7f)[0x7f5c96d5500f] /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x28d)[0x7f5c96d5854d] /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x243b)[0x7f5c96d5b1ab] /usr/sbin/mysqld(_Z10do_commandP3THD+0x16b)[0x7f5c96d5b75b] /usr/sbin/mysqld(_Z26threadpool_process_requestP3THD+0xa7)[0x7f5c96e51777] mysys/stacktrace.c:247(my_print_stacktrace)[0x7f5c96e9c425] sql/signal_handler.cc:160(handle_fatal_signal)[0x7f5c964bfaa1] sql/opt_range.cc:12843(get_sel_arg_for_keypart)[0x7f5c949a4a8d] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (0x7f5aaf1b5020): is an invalid pointer Connection ID (thread ID): 456 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 ------------ Anyone else encountered crashes on 10.1.15 ? Regards