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Message-ID:	<51F33565.1090406@cornell.edu>
Date:	Fri, 26 Jul 2013 22:50:13 -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
References:	<51F3151D DOT 7040000 AT cs DOT utoronto DOT ca>
In-Reply-To:	<51F3151D.7040000@cs.utoronto.ca>

On 7/26/2013 8:32 PM, Ryan Johnson wrote:
> Hi all,
>
> Running 64-bit cygwin 1.7.22(0.268/5/3), with emacs-nox 24.3-4 inside
> mintty 1.2-beta1-1, I keep getting seg faults and "Fatal error 6: Aborted"
>
> The most recent stackdump was:
>> Stack trace:
>> Frame        Function    Args
>> 0000021F960  0018006F893 (001008C3C40, 400000000FFF0000, 00180127C0D,
>> 00000229900)
>> 00000000006  00180070D5A (00000000000, 00100000000, 000000001DC,
>> 00000000000)
>> 0000021FB40  00180119F08 (006000670D0, 0000022D440, 0000021FC8C,
>> 00600067178)
>> 000000000C1  00180116FBE (0000021FFD0, 00000000000, 00000000000,
>> 0010049F140)
>> 00000000006  0018011748B (00000000000, 00000000000, 00000000000,
>> 00000000006)
>> 00000000006  0018011765C (00000000000, 00000000000, 00000000000,
>> 00000000000)
>> 00000000006  001801130CB (00000000000, 00000000000, 00000000000,
>> 00000000000)
>> End of stack trace
> ... addr2line translates to:
>> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/exception.h:65
>> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/exceptions.cc:1453
>> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/sigproc.cc:678
>> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/signal.cc:248
>> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/pinfo.h:171
>> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/signal.cc:285
>
> It happens at strange times, invariably during I/O of some kind (either
> keyboard input or output from some compilation window); I don't get the
> impression it's fork-related. I don't know how to get a backtrace from
> emacs, given the way any exception or signal always loses the "userland"
> stack (suggestions welcome).
>
> Anyone else seeing this?

This doesn't really answer your question since I don't use emacs-nox, 
but I've been running 64-bit emacs-X11 and finding it very stable.  I 
typically keep it running for several days at a time.

You say you don't know how to get a backtrace from emacs.  I assume 
you've installed emacs-debuginfo and run emacs under gdb.  Are you 
saying you can never get a backtrace after it crashes?

Ken

Ken

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