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Date:	Sun, 18 Aug 2013 00:53:42 -0400
From:	Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: emacs-nox hogs CPU if backgrounded during compile
Message-ID:	<20130818045342.GA1639@ednor.casa.cgf.cx>
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References:	<520FC3DC DOT 4010700 AT cs DOT utoronto DOT ca>
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On Sat, Aug 17, 2013 at 02:41:32PM -0400, Ryan Johnson wrote:
>The following STC causes emacs-nox to peg a CPU indefinitely. Emacs 
>remains responsive, but C-c C-k doesn't kill the compile; you have to 
>exit emacs to remove the "Compiling" status. Killing the buffer or 
>starting a new compile offers to kill the offending process, but doesn't.
>
>Attaching gdb shows an endless loop inside 
>kernelbase.dll!RaiseException, but provides no other clues that I could see.

I don't know if this trick works on 64-bit Cygwin or not but you could try:

set $rsp=$rbp
bt

And, if you get something sensible try it on every thread.

cgf

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