smbfs/cifs mounts in fstab causing ethernet interface lockups

[Jeff Layton]

On Fri, 29 Oct 2010 13:06:43 -0400
"Edsall, William (WJ) " <WJEdsall at dow.com> wrote:

> Two scenarios where this is happening:
> 
> 2.6.18-164.6.1.el5 -- Centos 5.4 64 bit via rocks
>  and
> 2.6.22.5-31-default -- Suse 10.3 64 bit
> 
> -----Original Message-----
> From: Jeff Layton [mailto:jlayton at poochiereds.net] On Behalf Of Jeff
> Layton
> Sent: Friday, October 29, 2010 1:04 PM
> To: Edsall, William (WJ)
> Cc: samba-technical at lists.samba.org
> Subject: Re: smbfs/cifs mounts in fstab causing ethernet interface
> lockups
> 
> On Fri, 29 Oct 2010 12:52:19 -0400
> "Edsall, William (WJ) " <WJEdsall at dow.com> wrote:
> 
> > 
> > > Hello samba list,
> > >  I'm experiencing a strange issue with smbfs mounts. Please help me
> > > troubleshoot this as it is locking up some of our servers.
> > > 
> > > I have the following mount in fstab:
> > > //servername/remote_folder  /local_folder  cifs   username=<user
> > > here>,password=<pass here>uid=12427,gid=4400  0       0
> > > 
> > > The purpose is to mount a remote directory for a custom application.
> > > Smbfs mounts were chosen for a specific reason over NFS mountss.
> > > 
> > > What's happening is, every so often due to unknown circumstances,
> this
> > > mount will become unavailable and will entirely lock-up the ethernet
> > > interface using it. For our clusters it's the public interface --
> the
> > > private will still be available.
> > > 
> > > After a lazy unmount of the smbfs mount, the interface is
> immediately
> > > available.
> > > 
> > > How can I make this mount more friendly so that these lock ups can
> be
> > > prevented?
> > > 
> > > 
> > > I'm not sure if this dmesg is from the forementioned problem, but
> I'll
> > > provide it just in case:
> > >  CIFS VFS: No response to cmd 115 mid 15
> > >  CIFS VFS: Send error in SessSetup = -11
> > >  CIFS VFS: No response to cmd 115 mid 17
> > >  CIFS VFS: Send error in SessSetup = -11
> > > 
> > > 
> > > Thanks ahead of time for your assistance!
> > > 
> 
> Kernel version?
> 

I don't think I've seen that problem before. Sounds almost like
something more closely related to the underlying networking rather than
something cifs-specific.

You may want to see if it's reproducible with a more recent kernel.

-- 
Jeff Layton <jlayton at samba.org>