Messages in this thread | | | Date | Tue, 15 Sep 2009 18:34:05 -0400 | From | Jeff Layton <> | Subject | Re: 2.6.31-rc8: CIFS with 5 seconds hiccups |
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On Mon, 14 Sep 2009 16:10:47 -0400 (EDT) Christoph Lameter <cl@linux-foundation.org> wrote:
> On Thu, 10 Sep 2009, Jeff Layton wrote: > > > In any case, I think we need to look closely at what's happening at > > mount time. First, I'll need some other info: > > > > 1) output of "/sbin/mount.cifs -V" from both machines > > The 32 bit machine > > #/sbin/mount.cifs -V > mount.cifs version: 1.5 > //chiprodfs2/company /mnt -ouser=clameter,domain=xxx > mount -t cifs //chiprodfs2/company /mnt -ouser=clameter,domain=xxx >
Yow, that version of mount.cifs is really old. I wonder if it may be passing bad mount options to the kernel? Might be interesting to strace that. Something like:
# strace -f -s 256 -e mount mount -t cifs //chiprodfs2/company /mnt -ouser=clameter,domain=xxx
...it'll probably have a cleartext password in it so you might want to doctor the options a bit before sending along if you do.
Alternately, you might just want to try a newer version of mount.cifs and see whether that fixes this.
> 64 bit machine > > $ /sbin/mount.cifs -V > mount.cifs version: 1.12-3.4.0 > > mount -t cifs //chiprodfs2/company /mnt -ouser=clameter,domain=w2k > > > 3) wire captures from mount attempts on both machines. Try to mount the > > "clameter" dir on both boxes and do captures of each attempt. Maybe > > this time use -s 0 with tcpdump so we get all of the traffic. > > I cannot mount the clameter dir on the 32 bit box. Hangs. So I will mount > /company. >
Actually, the trace of a hanging mount would probably be interesting.
Does the 32-bit capture that you sent represent a mount attempt that hung? Or was it successful?
> > There may be crackable password hashes in the captures, so you may want > > to send them to me privately and not cc the list. > > Ok will follow. >
Thanks for the info, I had a look at the captures. They both look fairly similar. The main difference is that the 32-bit box doesn't seem to have sent any more calls after sending a QPathInfo call to the server for the root inode of the mount.
What's the "devname" that you're giving to the mount command for the "clameter" dir? If there's more than 1 path component after the hostname, then the problem may be in the old version of mount.cifs. Some of them had broken handling for path prefixes.
-- Jeff Layton <jlayton@redhat.com>
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