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List:       linux-cifs-client
Subject:    [linux-cifs-client] Infrequent CIFS hang/slow response when
From:       Adam Tworkowski <atworkowski () 01 ! masterfile ! com>
Date:       2007-11-21 17:38:53
Message-ID: 582888016.136291195666733273.JavaMail.root () mail-1 ! 01 ! com
[Download RAW message or body]

I am seeing occasional hangs/very slow response while accessing shares on Windows \
Storage Server 2003.  There are two of these devices.  Shares are mounted via CIFS in \
/etc/fstab within two different branches (say /net/nas1, /net/nas2).  The client \
system is SLES9 with current patches.

The symptom is that on occasion an "ls" issued within one of root directories \
(/net/nas2) where six shares are mounted "hangs" for some time.  The logs show that \
each share is "evaluated" in serial until all are done at which point the "ls" ceases \
to hang and the root of each share is listed.

So far, we have only conclusively seen the issue on one Linux server and not another \
(only two are presently in the position to the see the issue.

Both servers are set up identically (or so I can tell) in terms of CIFS.  The only \
main difference between the servers is that the affected server was moved from on \
network to another, while unaffected one has always had the same IP.

I see the following when I do the ls and it stop here at the hang.

Nov 21 10:45:27 <myserver> kernel:  fs/cifs/inode.c: CIFS VFS: in cifs_revalidate as \
Xid: 14216 with uid: 0 Nov 21 10:45:27 <myserver> kernel:  fs/cifs/inode.c: \
Revalidate:  inode 0xef6639d4 count 1 dentry: 0xf20d1670 d_time 0 jiffies 930883372 \
Nov 21 10:45:27 <myserver> kernel:  fs/cifs/inode.c: Getting info on

Once the hang for the specific share is finished the logs continue:

\.DS_Store
Nov 21 10:45:59 stage11 kernel:  fs/cifs/transport.c: For smb_command 50
Nov 21 10:45:59 stage11 kernel:  fs/cifs/transport.c: Sending smb of length 94
Nov 21 10:45:59 stage11 kernel: | 0x00 0x00 0x00 0x5e 0xff 0x53 0x4d 0x42  |  _ _ _ ^ \
                \377 S M B
Nov 21 10:45:59 stage11 kernel: | 0x32 0x00 0x00 0x00 0x00 0x00 0x01 0xc0  |  2 _ _ _ \
                _ _ _
Nov 21 10:45:59 stage11 kernel: | 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00  |  _ _ _ _ \
_ _ _ _ [snip]

I believe that evaluation of each share hangs at "Getting info on" and then continues \
until the process is complete.

I can provide more logs if necessary.  If anyone can point at what stage in the CIFS \
dialogue this is occurring, that would be useful.  The domain control is smb-ldap \
based.

Regards,

Adam Tworkowski, atworkowski@masterfile.com
Systems Administrator, Computer Department
Masterfile Corporation, www.masterfile.com
416-929-6745 x.2287

Regards,

Adam Tworkowski, atworkowski@masterfile.com


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