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Date: Mon, 19 Aug 2013 14:42:20 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Stack size on 64-bit Cygwin
Message-ID: <20130819124220.GB31248@calimero.vinschen.de>
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References: <520E905A.409@cornell.edu> <20130819093242.GB18757@calimero.vinschen.de> <5211F83A.30901@cs.utoronto.ca> <5211FBB6.6070108@cs.utoronto.ca> <20130819113919.GA29385@calimero.vinschen.de> <521204EA.6020607@cs.utoronto.ca> <20130819123612.GA31248@calimero.vinschen.de>
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On Aug 19 14:36, Corinna Vinschen wrote:
> On Aug 19 07:43, Ryan Johnson wrote:
> > On 19/08/2013 7:39 AM, Corinna Vinschen wrote:
> > >On Aug 19 07:04, Ryan Johnson wrote:
> > >>So maybe emacs just had the incredibly bad luck to alloca() a large
> > >>buffer right at end-of-stack and then somehow managed to skip over
> > >>the 4 guard pages when accessing it?
> > >That's unlikely since alloca is designed to probe the stack in 4K
> > >steps.  And STATUS_STACK_OVERFLOW is translated to a SEGV by Cygwin's
> > >exception handler.
> > ... and yet somehow emacs managed to get around that protection
> > (unintentially), leading to all that fun over the last week. What
> > went wrong?
>=20
> Good question.  I don't know.

And then again, Emacs is not exactly an STC for *any* problem...


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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