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Message-ID:	<520DABDC.8020304@cs.utoronto.ca>
Date:	Fri, 16 Aug 2013 00:34:36 -0400
From:	Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
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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:	<520D900A.8000907@cornell.edu>

On 15/08/2013 10:35 PM, Ken Brown wrote:
> 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.
Well, at least I'm not (necessarily) crazy or BLODA-infested... out of 
curiosity, can you repro with 32-bit emacs-nox? I don't remember 32-bit 
being so crash-happy, which makes me wonder if something about 64-bit 
cygwin interacts poorly with emacs.

Ryan


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