Details
Critical Description
Hi-
I'm experiencing occasionally crashes in a query that joins a few tables, including a join to a view. From what I can tell from the stack trace, the problem may have something to do with the view. This query normally works fine, and when I run it in the command line client it is very fast.
However, under relatively heavy load, especially when I configure my connection pool to contain only a single connection, I get a crash - always on the same query. The stack trace is below, please let me know if there is any additional information I can provide.
Server version: 10.1.14-MariaDB-1~trusty
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key_buffer_size=134217728
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read_buffer_size=2097152
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max_used_connections=22
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max_threads=102
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thread_count=2
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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 = 759828 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: 0x0x7ff9153a2008
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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 = 0x7ff9482d51f0 thread_stack 0x48400
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/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x7ff951040b5e]
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/usr/sbin/mysqld(handle_fatal_signal+0x38d)[0x7ff950b6cabd]
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/lib/x86_64-linux-gnu/libpthread.so.0(+0x10330)[0x7ff94f0c2330]
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/usr/sbin/mysqld(_Z17create_view_fieldP3THDP10TABLE_LISTPP4ItemPKc+0x1bc)[0x7ff950a971ac]
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/usr/sbin/mysqld(_Z23find_field_in_table_refP3THDP10TABLE_LISTPKcjS4_S4_S4_PP4ItembbPjbPS2_+0x13f)[0x7ff9509abe1f]
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/usr/sbin/mysqld(_Z20find_field_in_tablesP3THDP10Item_identP10TABLE_LISTS4_PP4Item27find_item_error_report_typebb+0x143)[0x7ff9509ac903]
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/usr/sbin/mysqld(_ZN10Item_field10fix_fieldsEP3THDPP4Item+0x332)[0x7ff950b8c1c2]
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/usr/sbin/mysqld(_ZN9Item_func10fix_fieldsEP3THDPP4Item+0x19f)[0x7ff950bc714f]
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/usr/sbin/mysqld(_ZN9Item_cond10fix_fieldsEP3THDPP4Item+0xb9)[0x7ff950b9ce59]
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/usr/sbin/mysqld(_Z11setup_condsP3THDP10TABLE_LISTR4ListIS1_EPP4Item+0x18b)[0x7ff9509aee3b]
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/usr/sbin/mysqld(_ZN4JOIN7prepareEPPP4ItemP10TABLE_LISTjS1_jP8st_orderbS7_S1_S7_P13st_select_lexP18st_select_lex_unit+0x3c4)[0x7ff950a367f4]
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/usr/sbin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x924)[0x7ff950a41b54]
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/usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x245)[0x7ff950a41e15]
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/usr/sbin/mysqld(+0x428331)[0x7ff9509e4331]
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/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x61b9)[0x7ff9509f0a19]
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/usr/sbin/mysqld(_ZN18Prepared_statement7executeEP6Stringb+0x4b9)[0x7ff950a074e9]
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/usr/sbin/mysqld(+0x44b633)[0x7ff950a07633]
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/usr/sbin/mysqld(_Z19mysqld_stmt_executeP3THDPcj+0x17e)[0x7ff950a07b2e]
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/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0xfbf)[0x7ff9509f5f2f]
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/usr/sbin/mysqld(_Z10do_commandP3THD+0x169)[0x7ff9509f7b89]
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/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x18a)[0x7ff950abb24a]
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/usr/sbin/mysqld(handle_one_connection+0x40)[0x7ff950abb420]
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/lib/x86_64-linux-gnu/libpthread.so.0(+0x8184)[0x7ff94f0ba184]
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/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7ff94e5d937d]
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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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Query (0x7ff91798b020): is an invalid pointer
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Connection ID (thread ID): 2544
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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
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Thanks,
Kevin