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After upgrading to Ubuntu 13.04 I have experienced some compatibility
issues when mounting CIFS shares on the Ubuntu 13.04 workstation. The
following systems were tested:

 * Windows 2003 server CIFS shares: Success
 * EMC VNX CIFS shares: Success
 * Ubuntu 10.04.2 CIFS shares: Success
 * Nexenta CIFS shares: Failed

All the same shares continue to work from Ubuntu 12.10 systems. So in
Ubuntu 13.04, there has arisen a CIFS compatibility issue between Ubuntu
and Nexenta. I have also been in touch with our Nexenta supplier, and
they have set up a new machine with Nexenta OS with a CIFS share, and a
new install of Ubuntu 13.04, and they reproduced the same error. My
environment uses AD authentication, but the issue was reproduced without
AD authentication, so that's not it.

Here's the syslog excerpt from the failed mount, /proc/fs/cifs/cifsFYI
was set to 1 (removed date and hostname for brevity):

kernel: [  420.482254] /build/buildd/linux-3.8.0/fs/cifs/cifsfs.c: Devname: //10.0.0.27/share1 flags: 0 
kernel: [  420.482266] /build/buildd/linux-3.8.0/fs/cifs/connect.c: iocharset set to utf8
kernel: [  420.482274] /build/buildd/linux-3.8.0/fs/cifs/connect.c: Domain name set
kernel: [  420.482277] /build/buildd/linux-3.8.0/fs/cifs/connect.c: Username: ketil
kernel: [  420.482280] /build/buildd/linux-3.8.0/fs/cifs/connect.c: file mode: 0x1ed  dir mode: 0x1ed
kernel: [  420.483011] /build/buildd/linux-3.8.0/fs/cifs/connect.c: CIFS VFS: in cifs_mount as Xid: 2 with uid: 0
kernel: [  420.483013] /build/buildd/linux-3.8.0/fs/cifs/connect.c: UNC: \\10.0.0.27\share1
kernel: [  420.483023] /build/buildd/linux-3.8.0/fs/cifs/connect.c: Socket created
kernel: [  420.483024] /build/buildd/linux-3.8.0/fs/cifs/connect.c: sndbuf 16384 rcvbuf 87380 rcvtimeo 0x6d6
kernel: [  420.484263] /build/buildd/linux-3.8.0/fs/cifs/fscache.c: cifs_fscache_get_client_cookie: (0xffff8800b87bcc00/0xffff8800c6427050)
kernel: [  420.484266] /build/buildd/linux-3.8.0/fs/cifs/connect.c: CIFS VFS: in cifs_get_smb_ses as Xid: 3 with uid: 0
kernel: [  420.484267] /build/buildd/linux-3.8.0/fs/cifs/connect.c: Existing smb sess not found
kernel: [  420.484272] /build/buildd/linux-3.8.0/fs/cifs/cifssmb.c: secFlags 0x81
kernel: [  420.484273] /build/buildd/linux-3.8.0/fs/cifs/cifssmb.c: NTLMSSP only mechanism, enable extended security
kernel: [  420.484275] /build/buildd/linux-3.8.0/fs/cifs/transport.c: For smb_command 114
kernel: [  420.484276] /build/buildd/linux-3.8.0/fs/cifs/transport.c: Sending smb: smb_len=78
kernel: [  420.484495] /build/buildd/linux-3.8.0/fs/cifs/connect.c: Demultiplex PID: 3282
kernel: [  420.491908] /build/buildd/linux-3.8.0/fs/cifs/connect.c: RFC1002 header 0x5b
kernel: [  420.491919] /build/buildd/linux-3.8.0/fs/cifs/transport.c: cifs_sync_mid_result: cmd=114 mid=1 state=4
kernel: [  420.491922] /build/buildd/linux-3.8.0/fs/cifs/cifssmb.c: Dialect: 2
kernel: [  420.491924] /build/buildd/linux-3.8.0/fs/cifs/cifssmb.c: negprot rc 0
kernel: [  420.491926] /build/buildd/linux-3.8.0/fs/cifs/connect.c: Security Mode: 0x3 Capabilities: 0xf3fc TimeAdjust: -7200
kernel: [  420.491927] /build/buildd/linux-3.8.0/fs/cifs/sess.c: sess setup type 3
kernel: [  420.491929] /build/buildd/linux-3.8.0/fs/cifs/sess.c: ntlmssp session setup phase 1
kernel: [  420.491931] /build/buildd/linux-3.8.0/fs/cifs/transport.c: For smb_command 115
kernel: [  420.491932] /build/buildd/linux-3.8.0/fs/cifs/transport.c: Sending smb: smb_len=206
kernel: [  420.494445] /build/buildd/linux-3.8.0/fs/cifs/connect.c: RFC1002 header 0x23
kernel: [  420.494453] /build/buildd/linux-3.8.0/fs/cifs/transport.c: cifs_sync_mid_result: cmd=115 mid=2 state=4
kernel: [  420.494455] /build/buildd/linux-3.8.0/fs/cifs/netmisc.c: Mapping smb error code 0x10002 to POSIX err -5
kernel: [  420.494456] /build/buildd/linux-3.8.0/fs/cifs/misc.c: Null buffer passed to cifs_small_buf_release
kernel: [  420.494457] /build/buildd/linux-3.8.0/fs/cifs/sess.c: ssetup freeing small buf ffff8800c6421540
kernel: [  420.494458] CIFS VFS: Send error in SessSetup = -5
kernel: [  420.494461] /build/buildd/linux-3.8.0/fs/cifs/connect.c: CIFS VFS: leaving cifs_get_smb_ses (xid = 3) rc = -5
kernel: [  420.494466] /build/buildd/linux-3.8.0/fs/cifs/fscache.c: cifs_fscache_release_client_cookie: (0xffff8800b87bcc00/0xffff8800c6427050)
kernel: [  420.494523] /build/buildd/linux-3.8.0/fs/cifs/connect.c: CIFS VFS: leaving cifs_mount (xid = 2) rc = -5
kernel: [  420.494524] CIFS VFS: cifs_mount failed w/return code = -5

To summarize, a change that occurred between Ubuntu 12.10 and Ubuntu
13.04 is causing compatibility issues with the Nexenta CIFS shares. I
can't say from the information I have whether it's Ubuntu or Nexenta
that is not compliant, but if it is Ubuntu, this may be affecting other
systems as well.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: cifs-utils 2:5.5-1ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
Uname: Linux 3.8.0-21-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Tue May 28 15:04:35 2013
InstallationDate: Installed on 2013-05-08 (19 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: cifs-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug raring
-- 
Ubuntu 13.04 unable to mount Nexenta CIFS shares
https://bugs.launchpad.net/bugs/1185025
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