Daniel Black added a comment - 2020-07-16 03:36 To skip the stack trace you can use --skip-stack-trace on command line or as config option. https://mariadb.com/kb/en/mysqld-options/#-stack-trace

Rick Pizzi (Inactive) added a comment - 2020-07-16 06:27 danblack will this also skip memory dump?

Rick Pizzi (Inactive) added a comment - 2020-07-16 07:09 - edited Perusing the source code, I see that in case of a double segfault, core dump is skipped by default, regardless the value of that command line option. This explains why we aren't getting a core file.... extern "C" sig_handler handle_fatal_signal(int sig) { time_t curr_time; struct tm tm;   #ifdef HAVE_STACKTRACE THD *thd; /* This flag remembers if the query pointer was found invalid. We will try and print the query at the end of the signal handler, in case we're wrong. */ bool print_invalid_query_pointer= false; #endif   if (segfaulted) { my_safe_printf_stderr("Fatal " SIGNAL_FMT " while backtracing\n", sig); goto end; }   segfaulted = 1;   [ ... ]   #ifdef HAVE_WRITE_CORE if (test_flags & TEST_CORE_ON_SIGNAL) { my_write_core(sig); } #endif   end: #ifndef __WIN__ /* Quit, without running destructors (etc.) Use a signal, because the parent (systemd) can check that with WIFSIGNALED On Windows, do not terminate, but pass control to exception filter. */ signal(sig, SIG_DFL); kill(getpid(), sig);

Rick Pizzi (Inactive) added a comment - 2020-07-16 07:18 Following the code, it appears that the crash is indeed inside my_print_backtrace() and the actual memory dump is from the system library and not from MariaDB. We will try to run with the option you have mentioned. Thanks.

Daniel Black added a comment - 2020-07-16 07:32 You're welcome. It did look like your other MDEV crashed in my_print_backtrace. It doesn't quite eliminate the entire signal handler, however as you've seen its quite minimal with ---skip-stack-trace enabled. . Best wishes resolving the initial crash.

Marko Mäkelä added a comment - 2021-03-19 07:05 I suspect that MDEV-14229 increased the probability of this happening, due to invoking more code in the signal handler.