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Date:	Thu, 15 Aug 2013 22:35:54 -0400
From:	Ken Brown <kbrown AT cornell DOT edu>
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To:	cygwin AT cygwin DOT com
Subject:	Re: 64-bit emacs crashes a lot
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In-Reply-To:	<520D4036.8010303@cs.utoronto.ca>

On 8/15/2013 4:55 PM, Ryan Johnson wrote:
> At this point I'm pretty confident it's memory corruption of some kind.
> Consider the following semi-STC:
> 1. Invoke: emacs-nox -Q; echo -e "att $(jobs -p)\nc" > /dev/clipboard; fg
> 2. ^Z
> 3. (switch to window running gdb and hit [shift]+[insert] to paste from
> clipboard)
> 5. (switch to window running emacs): M-x compile C-a C-k ls [ret]
> 6. C-x o (to switch to the compilation output window)
> 7. Hit 'g' to keep repeating the "compilation" until gdb picks up a crash.

I tried a simpler version of this (without gdb and without 
suspending/resuming):

1. Invoke 'emacs-nox -Q' in mintty.

2. M-x compile C-a C-k ls RET

3. C-x o

4. Hit 'g' repeatedly.

I got it to abort with Fatal error 6 after slightly over 100 repetitions.

I then tried the same thing with emacs-X11 (running under X, not in 
mintty).  I hit 'g' 200 times without a problem.  I repeated this with 
emacs-w32, again 200 times without a problem.

So there's a bug somewhere.  But if it's an emacs bug, it's strange that 
it only occurs with emacs-nox and not with either of the GUI versions of 
emacs.

Ken

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