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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: gdb debug core file?
Date: Thu, 05 May 2016 19:10:43 +0300
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References: <20160505144951.GA25823@dstar.dstar.net>
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In-reply-to: <20160505144951.GA25823@dstar.dstar.net> (message from stanton
	arch on Thu, 5 May 2016 10:49:51 -0400)
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> Date: Thu, 5 May 2016 10:49:51 -0400
> From: stanton arch <stanton_arch@mail.com>
> 
> The program I was trying to debug is threaded, and I found that if I
> do an "info threads" inside of gdb then I can't view the backtrace of
> the corefile anymore, even running outside of emacs:
> 
>  Program terminated with signal SIGABRT, Aborted.
>  #0  0xbb1bfed7 in _lwp_kill () from /usr/lib/libc.so.12
>  (gdb) info threads
>  No threads.
>  (gdb) bt
>  Invalid selected thread.
>  (gdb)

What version of GDB is that?  If it's the latest, perhaps you should
report this to the GDB mailing list, where you will have the
definitive answer about whether this is a GDB or Emacs bug.

Thanks.