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Date: Tue, 31 Jul 2012 15:59:37 -0700 (PDT)
From: A Lichner <ales AT lichner DOT name>
To: cygwin AT cygwin DOT com
Subject: Re: sshd crashing
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Thanks Corinna. The fix works.
Ales


Corinna Vinschen-2 wrote:
> 
> On Jul 31 14:28, Corinna Vinschen wrote:
>> On Jul 30 17:49, Aleš wrote:
>> > 
>> > Hello,
>> > 
>> > I can confirm the issue. It's occurring after upgrade to 1.7.16 and
>> seems to
>> > be limited to VMWare guests in my case. Any write attempt within the
>> /etc
>> > directory causes sshd to crash. Other directories are fine.
>> > 
>> > uname -a before upgrade (sshd doens't crash):
>> > CYGWIN_NT-6.0-WOW64 dbs6 1.7.15(0.260/5/3) 2012-05-09 10:25 i686 Cygwin
>> > and after upgrade (sshd crashes):
>> > CyGWIN_NT-6.0-WOW64 dbs6 1.7.16(0.262/5/3) 2012-07-20 22:55 i686 Cygwin
>> > 
>> > 
>> > cygrunsrv -S sshd
>> > ssh localhost
>> > $ touch /etc/x
>> > Connection to localhost closed by remote host.
>> > Connection to localhost closed.
>> > 
>> > 
>> > A familiar message appears in the event log:
>> > service sshd failed: signal 11 raised 
>> > 
>> > The /etc/x file gets created in the example above. If running vim
>> /etc/x
>> > instead, the  .x.swp file gets also created and a vim-nox.exe process
>> keeps
>> > on living, taking all CPU resources till it's killed.
>> > 
>> > I have reproduced this on over ten machines running MS Server 2003 and
>> 2008,
>> > all VMware guests.
>> 
>> I can reproduce this as well.  I also found the patch which introduced
>> the problem, but it's not clear yet, why.  Stay tuned.
> 
> I've just applied a patch to fix this problem.  It seems this is a long
> standing bug which could result in random stack corruption after changing
> or adding any file to /etc.  I'm just generating a developer snapshot.
> Please test the today's snapshot from http://cygwin.com/snapshots/
> Just replacing /bin/cygwin1.dll with the snapshot DLL is sufficient.
> 
> 
> Thanks in advance,
> Corinna
> 
> -- 
> Corinna Vinschen                  Please, send mails regarding Cygwin to
> Cygwin Project Co-Leader          cygwin AT cygwin DOT com
> Red Hat
> 
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