From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-we0-f177.google.com (mail-we0-f177.google.com [74.125.82.177]) by kanga.kvack.org (Postfix) with ESMTP id 8E0FB6B0044 for ; Thu, 12 Jun 2014 23:28:00 -0400 (EDT) Received: by mail-we0-f177.google.com with SMTP id u56so2047577wes.8 for ; Thu, 12 Jun 2014 20:28:00 -0700 (PDT) Received: from mail-we0-f170.google.com (mail-we0-f170.google.com [74.125.82.170]) by mx.google.com with ESMTPS id hk8si6136wib.13.2014.06.12.20.27.58 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 12 Jun 2014 20:27:58 -0700 (PDT) Received: by mail-we0-f170.google.com with SMTP id w61so2166323wes.29 for ; Thu, 12 Jun 2014 20:27:58 -0700 (PDT) Date: Fri, 13 Jun 2014 06:27:54 +0300 From: Dan Aloni Subject: Re: mm/sched/net: BUG when running simple code Message-ID: <20140613032754.GA20729@gmail.com> References: <539A6850.4090408@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <539A6850.4090408@oracle.com> Sender: owner-linux-mm@kvack.org List-ID: To: Sasha Levin Cc: "linux-mm@kvack.org" , Andrew Morton , Ingo Molnar , Peter Zijlstra , LKML , "netdev@vger.kernel.org" , Dave Jones On Thu, Jun 12, 2014 at 10:56:16PM -0400, Sasha Levin wrote: > Hi all, > > Okay, I'm really lost. I got the following when fuzzing, and can't really explain what's > going on. It seems that we get a "unable to handle kernel paging request" when running > rather simple code, and I can't figure out how it would cause it. [..] > Which agrees with the trace I got: > > [ 516.309720] BUG: unable to handle kernel paging request at ffffffffa0f12560 > [ 516.309720] IP: netlink_getsockopt (net/netlink/af_netlink.c:2271) [..] > [ 516.309720] RIP netlink_getsockopt (net/netlink/af_netlink.c:2271) > [ 516.309720] RSP > [ 516.309720] CR2: ffffffffa0f12560 > > They only theory I had so far is that netlink is a module, and has gone away while the code > was executing, but netlink isn't a module on my kernel. The RIP - 0xffffffffa0f12560 is in the range (from Documentation/x86/x86_64/mm.txt): ffffffffa0000000 - ffffffffff5fffff (=1525 MB) module mapping space So seems it was in a module. -- Dan Aloni -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org