Ref MDEV-6308 which was my previous ticket
When increasing optimizer_use_condition_selectivity above 2, my server crashes completely - I'm not sure what query causes the crash, as its a live production environment with many many qps.
A list of my variables can be found here: https://gist.githubusercontent.com/jippi/81c2b80087308e11c767/raw/9f02e5fde3062925e98fd4996b6a9b30667160c2/gistfile1.txt
The list is with a working copy, it crashes if optimizer_use_condition_selectivity is increased above "2"
The stack trace is as below:
Server version: 10.0.15-MariaDB-1~wheezy-log
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key_buffer_size=25165824
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read_buffer_size=131072
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max_used_connections=522
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max_threads=1511
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thread_count=522
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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 = 3343761 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: 0x0x7f97b2260008
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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 = 0x7f97417c2e10 thread_stack 0x40000
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/usr/sbin/mysqld(my_print_stacktrace+0x2b)[0x7fc89d5cab9b]
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/usr/sbin/mysqld(handle_fatal_signal+0x422)[0x7fc89d15ae92]
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/lib/x86_64-linux-gnu/libpthread.so.0(+0xf0a0)[0x7fc89c7ad0a0]
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/usr/sbin/mysqld(_Z45fix_semijoin_strategies_for_picked_join_orderP4JOIN+0x68)[0x7fc89d0f3788]
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/usr/sbin/mysqld(_Z20get_best_combinationP4JOIN+0x60)[0x7fc89d0302e0]
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/usr/sbin/mysqld(+0x374104)[0x7fc89cf50104]
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/usr/sbin/mysqld(_ZN4JOIN14optimize_innerEv+0x84a)[0x7fc89d04bdba]
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/usr/sbin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0xd8)[0x7fc89d04e418]
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/usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x28d)[0x7fc89d051c0d]
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/usr/sbin/mysqld(+0x41b491)[0x7fc89cff7491]
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/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x4b8a)[0x7fc89d001a1a]
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/usr/sbin/mysqld(+0x4275ba)[0x7fc89d0035ba]
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/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x14df)[0x7fc89d004b7f]
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/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x47b)[0x7fc89d0c673b]
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/usr/sbin/mysqld(handle_one_connection+0x47)[0x7fc89d0c6817]
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/lib/x86_64-linux-gnu/libpthread.so.0(+0x6b50)[0x7fc89c7a4b50]
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/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fc89aeb17bd]
|
|
Trying to get some variables.
|
Some pointers may be invalid and cause the dump to abort.
|
Query (0x7f97ab53b020): is an invalid pointer
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Connection ID (thread ID): 591
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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=on,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=off,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,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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Bug
Major
