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Date:	Fri, 16 Aug 2013 11:58:54 +0300
From:	Eli Zaretskii <eliz AT gnu DOT org>
Subject:	Re: 64-bit emacs crashes a lot
In-reply-to:	<520D900A.8000907@cornell.edu>
To:	Ken Brown <kbrown AT cornell DOT edu>
Cc:	cygwin AT cygwin DOT com
Reply-to:	Eli Zaretskii <eliz AT gnu DOT org>
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References:	<51F3151D DOT 7040000 AT cs DOT utoronto DOT ca> <51F33565 DOT 1090406 AT cornell DOT edu> <51F33F52 DOT 4060405 AT cs DOT utoronto DOT ca> <51FB1D9E DOT 5090102 AT cs DOT utoronto DOT ca> <20130802080211 DOT GA18054 AT calimero DOT vinschen DOT de> <51FB9228 DOT 2020309 AT cornell DOT edu> <51FBA100 DOT 90005 AT cs DOT utoronto DOT ca> <51FD5462 DOT 5020400 AT cs DOT utoronto DOT ca> <51FFBDFF DOT 7040501 AT cornell DOT edu> <51FFC4F2 DOT 8080909 AT cs DOT utoronto DOT ca> <5203D89E DOT 6030801 AT cornell DOT edu> <5203DCCA DOT 1010105 AT cs DOT utoronto DOT ca> <5205B364 DOT 8090007 AT cs DOT utoronto DOT ca> <52064730 DOT 50404 AT cornell DOT edu> <"52065B3C DOT 6060104 AT cs DOT utoronto <520CCA41.3000107"@cs.utoronto.ca> <520D089A DOT 1020806 AT cornell DOT edu> <83ioz6op5v DOT fsf AT gnu DOT org> <520D4036 DOT 8010303 AT cs DOT utoronto DOT ca> <520D900A DOT 8000907 AT cornell DOT edu>

Again, please move this discussion to emacs-devel.

> Date: Thu, 15 Aug 2013 22:35:54 -0400
> From: Ken Brown <kbrown AT cornell DOT edu>
> 
> 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.

I suspect that buffer relocation might be the reason.  Can you show a
backtrace from the fatal error in an unoptimized build, with the above
recipe?

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