From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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 From: Benjamin Herrenschmidt To: Linas Vepstas In-Reply-To: <20070517002751.GC4325@austin.ibm.com> References: <20070517002751.GC4325@austin.ibm.com> Content-Type: text/plain Date: Thu, 17 May 2007 10:49:45 +1000 Message-Id: <1179362985.32247.252.camel@localhost.localdomain> Mime-Version: 1.0 Cc: linux-kernel@vger.kernel.org, cbe-oss-dev@ozlabs.org, linuxppc-dev@ozlabs.org, netdev@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , > 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.