linux-kernel - [2.6.39] CIFS write failures where 2.6.38 works

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Date:	Wed, 01 Jun 2011 12:11:10 +0200
From:	Helge Hafting <helge.hafting@...t.no>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [2.6.39] CIFS write failures where 2.6.38 works

At work I use cifs for accessing a windows server. This has worked fine 
for a long time, up to and including Debian's 2.6.38-2.

I just installed Debians's 2.6.39-1, and had to give up on it.
Mounting CIFS works, and I can see the files. But if I
try to make a new file (with cp), I get a long delay.

In this time, anything accessing CIFS will pause, including "ls".
CIFS eventually becomes unstuck, and I will find that my "ls" succeeded, 
but the file copy did not. The file was created, but
with 0 size.

Trying to copy the file again results in another stall, and so on.

When I mount CIFS, I get this message:
CIFS VFS: Unexpected SMB signature

This happens with 2.6.38 as well as 2.6.39.

When writes fail in 2.6.39, I also get:
CIFS VFS: Send error in Close = -512

Followed by:
CIFS VFS: Server servername has not responded in 300 seconds. 
Reconnecting...

I have also seen
CIFS VFS: Send error in Close = -512
and
CIFS VFS: Send error in read = -13

Helge Hafting
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