From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: Resending: RT patches expose netdev race [was Re: [RFC] [patch 2/2] powerpc 2.6.21-rt1: fix kernel hang and/or panic Date: Thu, 17 May 2007 10:49:45 +1000 Message-ID: <1179362985.32247.252.camel@localhost.localdomain> References: <20070517002751.GC4325@austin.ibm.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Tsutomu OWA , linuxppc-dev@ozlabs.org, mingo@elte.hu, tglx@linutronix.de, cbe-oss-dev@ozlabs.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: Linas Vepstas Return-path: Received: from gate.crashing.org ([63.228.1.57]:49691 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756359AbXEQAur (ORCPT ); Wed, 16 May 2007 20:50:47 -0400 In-Reply-To: <20070517002751.GC4325@austin.ibm.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org > I do not know why sk_buff->head would be null, or > would be set in a racy kind of way, or why the rt patches > would cause this. But the evidence implicates that. Would it be possible that a locking bug in spidernet would cause it under some circumstances to get a stale skb pointer ? Ben.