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From: Jan Beich <jbeich@FreeBSD.org>
To: Geordie <geordi@kos.net>
Cc: gecko@FreeBSD.org
Subject: Re: core dumped
References: <20170512130351.671a37db@geordieslaptop.home.network>
Date: Fri, 12 May 2017 19:27:02 +0200
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Geordie <geordi@kos.net> writes:

> uname -a
> FreeBSD geordieslaptop.home.network 11.0-STABLE FreeBSD 11.0-STABLE #2
> r317644: Mon May  1 11:43:03 EDT 2017 
>
> firefox-53.0.2,1
>
> Actually I was running 53.0_2,1 yesterday and when rebooted the
> machine firefox was kind enough to give me a core dump  and this message
>
> May 12 12:53:14 geordieslaptop kernel: pid 4202 (firefox), uid 1001:
> exited on signal 11 (core dumped)
> I upgraded to firefox-53.0.2,1 and gave me the same error
>
> Let me know if you want the core dump It is 11.1MiB

core(5) dumps may contain passwords, sessions, cookies, etc. and have to
exactly match the program they came from. Maybe extract useful bits
yourself e.g.,

  $ lldb $(which firefox) --core /path/to/firefox.core
  (lldb) bt

or

  $ pkg install gdb
  $ /usr/local/bin/gdb firefox /path/to/firefox.core
  (gdb) bt

It may give you an idea where to look e.g., which dependency to rebuild.
For debugging you'd have to bisect build environment until it matches
poudriere similar to how freebsd.org packages are built.