Hi Marko, do we want this? Thanks, Rex

I think that this would be best reviewed by someone who has worked on this code earlier.

The main thing to ensure is that this will not cause any regression on any platform. Unfortunately, the AIX build on 10.5 was broken by something related to MDEV-30700 some time ago, and a fix still has not been merged from 10.4.

I don't think there should be many or "each time the pipe is opened", add2line should be executed only once, from the crash handler.

If we want to have a backtracer that can be invoked many times run-time without aborting the server, we'd likely prefer something more lightweight.

I've just downloaded and looked at libbacktrace. License is a permissive BSD and a call like this

  i = backtrace_full (state, 0, callback_mtest, error_callback_one, &data);

produces data like this

$7 = {{filename = 0x5555555692a0 "/home/rex/src/mariadb/libbacktrace/binutils-gdb/libbacktrace/mtest.c", lineno = 110, function = 0x5555555692f0 "f3"}, {

    filename = 0x555555569310 "/home/rex/src/mariadb/libbacktrace/binutils-gdb/libbacktrace/mtest.c", lineno = 94, function = 0x555555569360 "f2"}, {

    filename = 0x555555569380 "/home/rex/src/mariadb/libbacktrace/binutils-gdb/libbacktrace/mtest.c", lineno = 88, function = 0x5555555693d0 "test1"}, {

    filename = 0x5555555693f0 "/home/rex/src/mariadb/libbacktrace/binutils-gdb/libbacktrace/mtest.c", lineno = 402, function = 0x555555569440 "main"}, {

    filename = 0x0, lineno = 0, function = 0x0}, {filename = 0x0, lineno = 0, function = 0x0}, {filename = 0x0, lineno = 0, function = 0x0}, {

Johnston see https://github.com/MariaDB/server/pull/2536#issuecomment-1512428174

Please properly update this MDEV so I can make some sense of the actual problem and what your proposed solution is.