Details
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Bug
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Status: Closed (View Workflow)
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Critical
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Resolution: Incomplete
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10.4.21, 10.5.12, 10.6.4, 10.4, 10.5, 10.6
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None
Description
Simple SELECT and also just EXPLAIN crash MariaDB server in certain data condition.
Example crash trace:
stack_bottom = 0x7f982069adb0 thread_stack 0x49000
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mysys/stacktrace.c:213(my_print_stacktrace)[0x55972f6abc1e]
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sql/signal_handler.cc:224(handle_fatal_signal)[0x55972f088aa7]
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sigaction.c:0(__restore_rt)[0x7f98364b73c0]
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sql/sql_select.cc:26822(st_join_table::save_explain_data(Explain_table_access*, unsigned long long, bool, st_join_table*))[0x55972eecb64f]
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sql/sql_select.cc:27378(JOIN::save_explain_data_intern(Explain_query*, bool, bool, bool, char const*))[0x55972eecd18b]
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sql/sql_select.cc:4256(JOIN::save_explain_data(Explain_query*, bool, bool, bool, bool))[0x55972eecd2f0]
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sql/sql_select.cc:1617(JOIN::build_explain())[0x55972eecd54c]
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sql/sql_select.cc:1674(JOIN::optimize())[0x55972eee2091]
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sql/sql_select.cc:4758(mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*))[0x55972eee2198]
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sql/sql_select.cc:27511(mysql_explain_union(THD*, st_select_lex_unit*, select_result*))[0x55972eee2ff2]
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sql/sql_parse.cc:6256(execute_sqlcom_select(THD*, TABLE_LIST*))[0x55972ed45807]
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sql/sql_parse.cc:4005(mysql_execute_command(THD*))[0x55972ee87fce]
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sql/sql_parse.cc:8100(mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool))[0x55972ee8a35c]
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sql/sql_parse.cc:1951(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool))[0x55972ee8cd5a]
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sql/sql_parse.cc:1375(do_command(THD*))[0x55972ee8e07f]
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sql/sql_connect.cc:1418(do_handle_one_connection(CONNECT*, bool))[0x55972ef797e2]
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sql/sql_connect.cc:1318(handle_one_connection)[0x55972ef79ab4]
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perfschema/pfs.cc:2204(pfs_spawn_thread)[0x55972f30087d]
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nptl/pthread_create.c:478(start_thread)[0x7f98364ab609]
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??:0(clone)[0x7f9836099293]
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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 (0x7f97a4012940): EXPLAIN SELECT COUNT(*) FROM mycrash WHERE (((p = 'foo' AND er != 4) OR er = 4 )) AND ((es >= 4)) limit 1
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Consistently reproducible with the example SQL dump attached. Sometimes the EXPLAIN needs to be run 3-4 times before it starts crashing.
Reproduced on latest 10.4, 10.5 and 10.6 versions with:
$ dbdeployer deploy single 10.6.4
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$ msb_10_6_4/use test < mycrash_1.sql |
$ msb_10_6_4/use test |
mysql [localhost:10604] {msandbox} (test) > SELECT COUNT(*) FROM mycrash WHERE (((p = 'foo' AND er != 4) OR er = 4 )) AND ((es >= 4)) limit 1; |
ERROR 2013 (HY000): Lost connection to server during query |
Problem similar I guess to MDEV-19720 and MDEV-22160.
I am very interested if there is any workaround to avoid these crashes.
Attachments
Issue Links
- is caused by
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MDEV-27262 Unexpected index intersection with full index scan for an index
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- Closed
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- relates to
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MDEV-19720 Server crash in st_join_table::save_explain_data or Assertion `sel->quick' failed in JOIN::make_range_rowid_filters with rowid_filter=on
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- Closed
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MDEV-30651 Crash after killing query while it is processed by test_quick_select
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- Closed
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MDEV-33510 Server crash : mysqld got signal 11 in st_join_table::save_explain_data
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- Stalled
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