From: "Fredrik Lindgren" <fli@swip.net>
Subject: NFS corruption in 2.6.18.2?
Date: Tue, 14 Nov 2006 19:09:17 +0100
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Hello

We're running a mail system with Linux machines being served by two
NetApps. (Debian stable, our "own" kernel off kernel.org)

At present we're running 2.6.13 kernels, we had some corruption issues
before that was fixed in 2.6.13. However when we tried to upgrade
to 2.6.18.2 the we see corruption again.

pre 2.6.13 the problem seemed to be that the file size was being
cached, which meant that sometimes there were blocks of NULL
characters in the files.

With 2.6.18.2 we see blocks of NULL chars in the data again, this time
it's sometimes in the middle of a message. pre 2.6.13 that didn't
happen,
then there were just big blocks of NULL chars between two messages. 
The only consistent thing is that it only occurs when the 1 machine
running 2.6.18.2 (out of 5) has delivered a message to the spool-file.

I don't know if it's relevant, but when checking the NFS stats I see
the 2.6.18.2 machine doing almost precisely half the amount of "GetAttr"
calls compared to the 2.6.13 machines.

Is this something anyone else has seen?

Also on a side note, the statistics still seem to be using signed
values, so we're seeing negative numbers on some stats after some
uptime. This is true for both using "nfsstat" and "cat
/proc/net/rpc/nfs.

Regards,
  Fredrik Lindgren


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