Re: cifs and Netapp DFS-shares problems

[Marcus <lists@localguru.de>]

Hi Jeff,

Am Freitag, den 10.12.2010, 06:34 -0500 schrieb Jeff Layton:
> On Fri, 10 Dec 2010 11:25:46 +0100
> Marcus <lists@localguru.de> wrote:
> 
> > Hi,
> > 
> > Am Donnerstag, den 09.12.2010, 01:37 +0100 schrieb Marcus:
> > > 
> > > are there any known issues with cifs and DFS-shares on Netapp file
> > > servers? We have a Netapp file sever with DFS on the user's home shares.
> > > The home shares can successfully mounted with
> > > 
> > >   mount -t cifs //sever/home/username /mnt/ -o user=username,domain=AD
> > > 
> > > but the connection hangs in the moment a directory listing is started.
> > > The strange thing is that only shares with activated DFS show this
> > > problem. I'm not maintaining the Netapp file server therefore a can't
> > > post more information about that system. On client side I'm using Ubuntu
> > > LTS 10.04.1.
> > 
> > This error only comes up, if DFS is activated on a share on the NetApp
> > Server. Here is a kernel log:
> > 
> > Dec 10 11:10:37 lebowski kernel: [ 3586.471662] Bad SMB: : dump of 48
> > bytes of data at 0xe44e5c00
> > Dec 10 11:10:37 lebowski kernel: [ 3586.471675]  0000009a 424d53ff
> > 00000032 80018800 . . . . ÿ S M B 2 . . . . . . .
> > Dec 10 11:10:37 lebowski kernel: [ 3586.471688]  00000000 00000000
> > 00000000 26420040 . . . . . . . . . . . . @ . B &
> > Dec 10 11:10:37 lebowski kernel: [ 3586.471701]  001a0800 7000020a
> > 02000000 00003800 . . . . . . . p . . . . . 8 . .
> > Dec 10 11:11:03 lebowski kernel: [ 3612.832108]  CIFS VFS: server not
> > responding
> > Dec 10 11:11:03 lebowski kernel: [ 3612.832125]  CIFS VFS: No response
> > for cmd 50 mid 26
> > Dec 10 11:11:05 lebowski kernel: [ 3614.656937]  CIFS VFS: RFC1001 size
> > 154 bigger than SMB for Mid=30
> > Dec 10 11:11:05 lebowski kernel: [ 3614.656953] Bad SMB: : dump of 48
> > bytes of data at 0xe44e5c00
> > Dec 10 11:11:05 lebowski kernel: [ 3614.656967]  0000009a 424d53ff
> > 00000032 80018800 . . . . ÿ S M B 2 . . . . . . .
> > Dec 10 11:11:05 lebowski kernel: [ 3614.656979]  00000000 00000000
> > 00000000 26420040 . . . . . . . . . . . . @ . B &
> > Dec 10 11:11:05 lebowski kernel: [ 3614.656994]  001e0800 7000020a
> > 02000000 00003800 . . . . . . . p . . . . . 8 . .
> > Dec 10 11:11:33 lebowski kernel: [ 3642.832284]  CIFS VFS: server not
> > responding
> > Dec 10 11:11:33 lebowski kernel: [ 3642.832299]  CIFS VFS: No response
> > for cmd 50 mid 30
> > Dec 10 11:11:40 lebowski kernel: [ 3649.895000]  CIFS VFS: RFC1001 size
> > 154 bigger than SMB for Mid=34
> > Dec 10 11:11:40 lebowski kernel: [ 3649.895017] Bad SMB: : dump of 48
> > bytes of data at 0xe44e5c00
> > Dec 10 11:11:40 lebowski kernel: [ 3649.895030]  0000009a 424d53ff
> > 00000032 80018800 . . . . ÿ S M B 2 . . . . . . .
> > Dec 10 11:11:40 lebowski kernel: [ 3649.895043]  00000000 00000000
> > 00000000 26420040 . . . . . . . . . . . . @ . B &
> > Dec 10 11:11:40 lebowski kernel: [ 3649.895056]  00220800 7000020a
> > 02000000 00003800 . . " . . . . p . . . . . 8 . .
> > --------------------------
> > 
> > umounting is impossible and gives the following error:
> > 
> > --------------------------
> > unmount error 16 = Device or resource busy
> > Refer to the umount.cifs(8) manual page (man 8 umount.cifs)
> > unmount error 16 = Device or resource busy
> > Refer to the umount.cifs(8) manual page (man 8 umount.cifs)
> > --------------------------
> > 
> > Any ideas? Seems to be an error of the NetApp Fileserver acting not RFC
> > conform.
> > 
> > Is this the right list to discuss or should I post on linux-cifs-client
> > list?
> > 
> (cc'ing linux-cifs mailing list)
> 
> Probably because the ls is hung and is holding references to the mount...
> 
> I've successfully tested against netapp's CIFS implementation in the
> past, but there are significant bugs in it. The errors you're seeing
> look like an alignment problem of some sort -- i.e. the server is
> sending packets that have incorrect length fields in them. This isn't
> the first such problem I've seen with OnTap.
> 
> You're welcome to open a bug at bugzilla.samba.org, cc me, and I'll
> take a look when I have time. Gathering wire captures during one of
> these events and attaching them to the bug would help to track down the
> problem. It's likely to be Netapp's bug however...

Thanks for helping. I've posted a bug [1] with a tcpdump.

Have a nice weekend,
Marcus

[1] https://bugzilla.samba.org/show_bug.cgi?id=7860


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