netdev - TCP-MD5 checksum failure on x86

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Message-ID: <o2h571fb4001005032030tdf02a4fag520ec4e56ebdb8df@mail.gmail.com>
Date:	Tue, 4 May 2010 09:00:34 +0530
From:	Bhaskar Dutta <bhaskie@...il.com>
To:	netdev@...r.kernel.org
Subject: TCP-MD5 checksum failure on x86_64 SMP

Hi,

I am observing intermittent TCP-MD5 checksum failures
(CONFIG_TCP_MD5SIG)  on kernel 2.6.31 while talking to a BGP router.

The problem is only seen in multi-core 64 bit machines.
Is there any known bug in the per_cpu_ptr implementation (I am aware
that the percpu allocator has been re-implemented in 2.6.33) that
might cause a corruption in 64 bit SMP machines?

Any pointers would be appreciated.

Thanks,
Bhaskar
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