Details
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Bug
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Status: Confirmed (View Workflow)
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Critical
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Resolution: Unresolved
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10.4(EOL), 10.5, 10.6, 10.7(EOL), 10.8(EOL), 10.9(EOL), 10.10(EOL), 10.11
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None
Description
Execute the following repeatedly (using using multiple threads and random order, if you like, though these are likely not necessary from current observations).
Note that there is a significant SHUTDOWN command in the testcase, so standard run methods (like MTR/CLI) may not work. We have a specialized script for this in the mariadb-qa (multirun_mysqld_text) which can be setup to produce this issue in 1-2 minutes. Please let me know if this would help and I will set it up for you.
The issue tends to reproduce quite easily with 200 non-random client threads against approx 10 mysqld's.
DROP DATABASE test;
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CREATE DATABASE test;
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USE test;
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SET GLOBAL binlog_checksum=NONE;
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SHUTDOWN;
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SET GLOBAL event_scheduler=1;
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SELECT SLEEP (3);
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Leads, sporadically, to:
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10.6.0 03ff588d153f22f00ff00923e82498cbac63505f (Debug) |
Core was generated by `/test/MD060321-mariadb-10.6.0-linux-x86_64-dbg/bin/mysqld --core-file --core --'.
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Program terminated with signal SIGSEGV, Segmentation fault.
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#0 __pthread_kill (threadid=<optimized out>, signo=signo@entry=11)
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at ../sysdeps/unix/sysv/linux/pthread_kill.c:56
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[Current thread is 1 (Thread 0x14955d4ea700 (LWP 173779))]
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(gdb) bt
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#0 __pthread_kill (threadid=<optimized out>, signo=signo@entry=11) at ../sysdeps/unix/sysv/linux/pthread_kill.c:56
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#1 0x00005652e630a3f3 in my_write_core (sig=sig@entry=11) at /test/10.6_dbg/mysys/stacktrace.c:424
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#2 0x00005652e5aaf195 in handle_fatal_signal (sig=11) at /test/10.6_dbg/sql/signal_handler.cc:331
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#3 <signal handler called>
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#4 0x00005652e5cd553a in Event_queue::recalculate_activation_times (this=0x1494ec02a470, thd=thd@entry=0x1494e002ebd8) at /test/10.6_dbg/sql/event_queue.cc:464
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#5 0x00005652e5cd3aa5 in Event_scheduler::run (this=this@entry=0x1494ec02a5d0, thd=0x1494e002ebd8) at /test/10.6_dbg/sql/event_scheduler.cc:485
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#6 0x00005652e5cd3da8 in event_scheduler_thread (arg=arg@entry=0x1494e003d138) at /test/10.6_dbg/sql/event_scheduler.cc:236
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#7 0x00005652e5df0ce9 in pfs_spawn_thread (arg=0x1494e003d1e8) at /test/10.6_dbg/storage/perfschema/pfs.cc:2201
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#8 0x0000149575aed609 in start_thread (arg=<optimized out>) at pthread_create.c:477
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#9 0x00001495756dc293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
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