From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: Re: TCP-MD5 checksum failure on x86_64 SMP Date: Tue, 04 May 2010 12:32:02 +0100 Message-ID: <1272972722.2097.1.camel@achroite.uk.solarflarecom.com> References: Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Bhaskar Dutta Return-path: Received: from exchange.solarflare.com ([216.237.3.220]:56218 "EHLO exchange.solarflare.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752058Ab0EDLcF (ORCPT ); Tue, 4 May 2010 07:32:05 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: 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 , 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.