#3 <signal handler called>
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#4 0x0000000000eeced9 in thr_multi_unlock (data=0x7fa6e4c132c8, count=1, unlock_flags=0) at 10.0/mysys/thr_lock.c:1300
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#5 0x00000000009264a8 in mysql_unlock_tables (thd=0x7fa6e7b3d070, sql_lock=0x7fa6e4c132b0, free_lock=true) at 10.0/sql/lock.cc:384
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#6 0x0000000000926520 in mysql_unlock_some_tables (thd=0x7fa6e7b3d070, table=0x7fa6e4dedc88, count=1) at 10.0/sql/lock.cc:400
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#7 0x0000000000699268 in JOIN::optimize_inner (this=0x7fa6e4f3ba30) at 10.0/sql/sql_select.cc:1375
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#8 0x0000000000697dcc in JOIN::optimize (this=0x7fa6e4f3ba30) at 10.0/sql/sql_select.cc:1012
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#9 0x000000000069f9a5 in mysql_select (thd=0x7fa6e7b3d070, rref_pointer_array=0x7fa6e7b41688, tables=0x7fa6e4f55d58, wild_num=1, fields=..., conds=0x7fa6e4f37f68, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2684619524, result=0x7fa6e4f3b370, unit=0x7fa6e7b40d38, select_lex=0x7fa6e7b41418) at 10.0/sql/sql_select.cc:3278
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#10 0x00000000006d1999 in mysql_explain_union (thd=0x7fa6e7b3d070, unit=0x7fa6e7b40d38, result=0x7fa6e4f3b370) at 10.0/sql/sql_select.cc:23545
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#11 0x000000000066b402 in execute_sqlcom_select (thd=0x7fa6e7b3d070, all_tables=0x7fa6e4f55d58) at 10.0/sql/sql_parse.cc:5184
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#12 0x0000000000663ab8 in mysql_execute_command (thd=0x7fa6e7b3d070) at 10.0/sql/sql_parse.cc:2552
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#13 0x000000000066dd78 in mysql_parse (thd=0x7fa6e7b3d070, rawbuf=0x7fa6e4f55088 "EXPLAIN SELECT * FROM (INFORMATION_SCHEMA . `INNODB_SYS_FOREIGN` AS table1 RIGHT JOIN INFORMATION_SCHEMA . `CHARACTER_SETS` AS table2 ON ( table2 . `MAXLEN` = table1 . `ID` ) ) WHERE ( ( ( ( ( (NO"..., length=558, parser_state=0x7fa6ef39b630) at 10.0/sql/sql_parse.cc:6365
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#14 0x0000000000660cba in dispatch_command (command=COM_QUERY, thd=0x7fa6e7b3d070, packet=0x7fa6e6fe2071 "", packet_length=559) at 10.0/sql/sql_parse.cc:1296
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#15 0x000000000066005c in do_command (thd=0x7fa6e7b3d070) at 10.0/sql/sql_parse.cc:993
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#16 0x0000000000777fb9 in do_handle_one_connection (thd_arg=0x7fa6e7b3d070) at 10.0/sql/sql_connect.cc:1379
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#17 0x0000000000777d0c in handle_one_connection (arg=0x7fa6e7b3d070) at 10.0/sql/sql_connect.cc:1293
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#18 0x0000000000a987cd in pfs_spawn_thread (arg=0x7fa6e6e3cdf0) at 10.0/storage/perfschema/pfs.cc:1853
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#19 0x00007fa6ef0e8b50 in start_thread (arg=<optimized out>) at pthread_create.c:304
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#20 0x00007fa6edc37a7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
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#21 0x0000000000000000 in ?? ()
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