Re: Bus Error with Unicorn 6.0 on OpenBSD/adJ 6.8 with Ruby 3.0

[Eric Wong <e@80x24.org>]

Jeremy Evans <code@jeremyevans.net> wrote:
> Unfortunately, given the required amount of setup, I don't think I'll
> have time to look into this.  The best way to debug this is to start
> removing code/dependencies piece by piece until the problem goes away.
> Once the problem goes away, add that code back, and make sure it fails
> again, then start removing other code/dependencies.  Repeat this process
> until you have the most minimal example, where removing any additional
> code/dependencies will stop the code from failing.

The above is exactly what I would do, too.

I would also try to correlate the time of Bus Errors with logs
of when + which requests are failing, and try replaying only
those requests to narrow things down.

Also, do you have core dumps enabled?  Enable those
("ulimit -c unlimited" in sh), and run gdb on them as you get
them.  The .gdbinit in the source tree of the Ruby version
you're using is helpful not just for Ruby itself, but
also C extensions, too.  I'm no a gdb expert, but it's
well-documented and has built-in help.