netdev - Re: TCP-MD5 checksum failure on x86

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Date:	Tue, 04 May 2010 12:32:02 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Bhaskar Dutta <bhaskie@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: TCP-MD5 checksum failure on x86_64 SMP

On Tue, 2010-05-04 at 09:00 +0530, Bhaskar Dutta wrote:
> 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.

There was another recent report of incorrect MD5 signatures in
<http://thread.gmane.org/gmane.linux.network/159556>, but without any
response.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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