[Samba] CIFS mount intermitte​ntly unavailabl​e: cifs_mount failed w/return code = -5

[Jeff Layton]

On Mon, 27 Aug 2012 08:48:42 -0400
Jeff Layton <jlayton at samba.org> wrote:

> On Thu, 16 Aug 2012 19:57:27 +1000
> Robert S <robert.spam.me.senseless at gmail.com> wrote:
> 
> > I have a debian machine called "debian" and a windows XP machine
> > called "server".  I have a permanent mounted read-only share called
> > \\server\doc.  My /etc/fstab looks like this:
> > 
> > //server/doc    /opt/chroot/mnt/server cifs
> > credentials=/root/.smbmount,username=medical,uid=medical,file_mode=0755,dir_mode=0755,noserverino
> > 0 0
> > 
> > This works well most of the time but at times I get a input/output
> > error when I try to access this share.  My syslog shows the following:
> > 
> > Aug 16 15:36:35 debian kernel: [1289131.676869] Status code returned
> > 0xc00000d0 NT_STATUS_REQUEST_NOT_ACCEPTED
> > Aug 16 15:36:35 debian kernel: [1289131.676875]  CIFS VFS: Send error
> > in SessSetup = -5
> > Aug 16 15:36:35 debian kernel: [1289131.676899]  CIFS VFS: cifs_mount
> > failed w/return code = -5
> > Aug 16 15:36:46 debian kernel: [1289142.653770] Status code returned
> > 0xc00000d0 NT_STATUS_REQUEST_NOT_ACCEPTED
> > Aug 16 15:36:46 debian kernel: [1289142.653775]  CIFS VFS: Send error
> > in SessSetup = -5
> > Aug 16 15:36:46 debian kernel: [1289142.653799]  CIFS VFS: cifs_mount
> > failed w/return code = -5
> > Aug 16 15:37:01 debian kernel: [1289158.491697] Status code returned
> > 0xc00000d0 NT_STATUS_REQUEST_NOT_ACCEPTED
> > Aug 16 15:37:01 debian kernel: [1289158.491703]  CIFS VFS: Send error
> > in SessSetup = -5
> > Aug 16 15:37:01 debian kernel: [1289158.491727]  CIFS VFS: cifs_mount
> > failed w/return code = -5
> > 
> > Does anyone have any suggestions?  Can somebody explain what return
> > code -5 means?
> > 
> > I have tried replacing "server" with its fixed IP address
> > (192.168.0.32), but this does not help.  I have even moved all the
> > files to another location on the Windows box and recreated the share,
> > but it still occurs.
> 
> (cc'ing linux-cifs ml)
> 
> -5 is -EIO which is the generic error that we map stuff to when there's
> not a better mapping. We don't have a standard mapping for
> NT_STATUS_REQUEST_NOT_ACCEPTED, so that's why you get -EIO back.
> 
> The bigger question is why your server is returning that error. You may
> need to check the logs on the server side to see why it's not accepting
> these requests.
> 

...and interestingly, the description of this error in the MS-CIFS doc
from microsoft says: "No resources currently available for this SMB
request.", which sounds like you're occasionally hitting some sort of
resource limit on the server...

-- 
Jeff Layton <jlayton at samba.org>