sshd crashing

Corinna Vinschen corinna-cygwin@cygwin.com
Tue Jul 31 20:19:00 GMT 2012


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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