X-Recipient: archive-cygwin AT delorie DOT com
DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; q=dns; s=
	default; b=ToQ3eZdKPwAj/3wFxJ6uPAnqNi8qYYz9dhhXwljpxeBrAXxTqx36G
	Qg1mAlYtzSZJtGijpG1P8DfLesZckvttGWrhykfD0Y5CCnG3cKAx9NCxbLTK9XUI
	nmyW62Bta8Q9i+Hkk6NoikRZlO3IiS4L1Ws7EDjhiwfpUwkv6KC1Hc=
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; s=default;
	 bh=Jrk30PikLxE+MnepzvNXTQXygiU=; b=R37GeAPNvK97BqbhzgpajaKyAte5
	od/A6Q/3VyGwC+VjTRcPdfYS1QK6ZbSV7gWrcBsgJ0U1JltPCVT9YftDjeuNWuD1
	gmvnjX/O+Vt8gqb+d53xJ5CmuR9dxbjGGHc2XP/DykjRhejgBv+70TBS3z7bVi/4
	LB92la+keLa9Ako=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
X-Spam-SWARE-Status: No, score=-0.1 required=5.0 tests=AWL,BAYES_20,RDNS_NONE autolearn=no version=3.3.1
Date: Fri, 2 Aug 2013 10:02:11 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: 64-bit emacs crashes a lot
Message-ID: <20130802080211.GA18054@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
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>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <51FB1D9E.5090102@cs.utoronto.ca>
User-Agent: Mutt/1.5.21 (2010-09-15)

On Aug  1 22:46, Ryan Johnson wrote:
> On 26/07/2013 11:32 PM, Ryan Johnson wrote:
> >On 26/07/2013 10:50 PM, Ken Brown wrote:
> >>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"
> >
> >>>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?
> >I do have the emacs-debuginfo. I meant that the stack dump didn't
> >have any emacs frames in it (they were all cygwin1.dll), and my
> >experience with cygwin/gdb is that once you've taken a signal or
> >exception you lose the cygwin stack and just see a bunch of
> >threads mucking around in various low-level Windows dlls.
> >
> >I have tried attaching gdb to emacs and setting a breakpoint on
> >abort(), but it didn't catch anything yet. I'm also hampered by
> >gdb constantly getting confused, breaking partway into emacs, and
> >having to detach/reattach it. I've started a new thread for that
> >issue.
> 
> Here's a new one... I started a compilation, but before it actually
> invoked the command it started pegging the CPU. After ^G^G^G, it
> crashed with the following:
> >Auto-save? (y or n) y
> >      0 [main] emacs 5076 C:\cygwin64\bin\emacs-nox.exe: *** fatal
> >error - Internal error: TP_NUM_W_BUFS too small 2268032 >= 10.

That looks like a memory overwrite.  2268032 is 0x229b80, which looks
suspiciously like a stack address.  And the overwritten value is on the
stack, too, well within the cygwin TLS area.  If *this* value gets
overwritten, the TLS is probbaly totally hosed at this point.  There's
just no way to infer the culprit from this limited info.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple