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Message-ID: <20100504091215.5a4a51f4@nehalam> Date: Tue, 4 May 2010 09:12:15 -0700 From: Stephen Hemminger <shemminger@...tta.com> To: Bhaskar Dutta <bhaskie@...il.com> Cc: Ben Hutchings <bhutchings@...arflare.com>, netdev@...r.kernel.org Subject: Re: TCP-MD5 checksum failure on x86_64 SMP On Tue, 4 May 2010 19:58:32 +0530 Bhaskar Dutta <bhaskie@...il.com> wrote: > On Tue, May 4, 2010 at 5:02 PM, Ben Hutchings <bhutchings@...arflare.com> wrote: > > 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. > > > > I found another thread posted back in Jan 2007 with a similar bug > (x86_64 on 2.6.20) but no replies to that as well. > http://lkml.org/lkml/2007/1/20/56 2.6.20 had lots of other MD5 bugs. Your problem might be related to GRO. MD5 may not handle multi-fragment packets. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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