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180823 19:01:19 [ERROR] mysqld got signal 11 ;
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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.
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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.
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Server version: 10.3.9-MariaDB-log
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key_buffer_size=67108864
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read_buffer_size=1048576
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max_used_connections=4
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max_threads=602
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thread_count=11
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It is possible that mysqld could use up to
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key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1928308 K bytes of memory
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Hope that's ok; if not, decrease some variables in the equation.
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Thread pointer: 0x7f2bc80009a8
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Attempting backtrace. You can use the following information to find out
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where mysqld died. If you see no messages after this, something went
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terribly wrong...
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stack_bottom = 0x7f2cc37e8d68 thread_stack 0x49000
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/usr/libexec/mysqld(my_print_stacktrace+0x2e)[0x7f2cc457fc0e]
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/usr/libexec/mysqld(handle_fatal_signal+0x5ad)[0x7f2cc3ffb00d]
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/lib64/libpthread.so.0(+0x34ac40f7e0)[0x7f2cc34067e0]
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/lib64/libc.so.6(+0x34ac13394f)[0x7f2cc1b6194f]
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/usr/libexec/mysqld(_ZN11String_list10append_strEP11st_mem_rootPKc+0x2d)[0x7f2cc3f0cefd]
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/usr/libexec/mysqld(_ZN17Explain_index_use3setEP11st_mem_rootP6st_keyj+0x88)[0x7f2cc3f0d198]
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/usr/libexec/mysqld(_ZN13st_join_table17save_explain_dataEP20Explain_table_accessybPS_+0x334)[0x7f2cc3e254a4]
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/usr/libexec/mysqld(_ZN4JOIN24save_explain_data_internEP13Explain_querybbbPKc+0xbe7)[0x7f2cc3e2bd97]
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/usr/libexec/mysqld(_ZN4JOIN17save_explain_dataEP13Explain_querybbbb+0xab)[0x7f2cc3e2bf2b]
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/usr/libexec/mysqld(_ZN4JOIN13build_explainEv+0x91)[0x7f2cc3e2c161]
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/usr/libexec/mysqld(_ZN4JOIN8optimizeEv+0x6b)[0x7f2cc3e45adb]
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/usr/libexec/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_jP8st_orderS9_S7_S9_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x93)[0x7f2cc3e48b13]
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/usr/libexec/mysqld(_Z19mysql_explain_unionP3THDP18st_select_lex_unitP13select_result+0x113)[0x7f2cc3e49613]
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/usr/libexec/mysqld(+0x5ad0b2)[0x7f2cc3de40b2]
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/usr/libexec/mysqld(_Z21mysql_execute_commandP3THD+0x3a1f)[0x7f2cc3de9b9f]
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/usr/libexec/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x254)[0x7f2cc3defe44]
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/usr/libexec/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x236c)[0x7f2cc3df336c]
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/usr/libexec/mysqld(_Z10do_commandP3THD+0x18f)[0x7f2cc3df3e2f]
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/usr/libexec/mysqld(_Z24do_handle_one_connectionP7CONNECT+0x22f)[0x7f2cc3edd3af]
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/usr/libexec/mysqld(handle_one_connection+0x44)[0x7f2cc3edd544]
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/lib64/libpthread.so.0(+0x34ac407aa1)[0x7f2cc33feaa1]
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/lib64/libc.so.6(clone+0x6d)[0x7f2cc1b16bcd]
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Trying to get some variables.
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Some pointers may be invalid and cause the dump to abort.
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Connection ID (thread ID): 10
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Status: NOT_KILLED
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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,split_materialized=on
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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.
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