From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755887AbZBKMse (ORCPT ); Wed, 11 Feb 2009 07:48:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754235AbZBKMsZ (ORCPT ); Wed, 11 Feb 2009 07:48:25 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:41907 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754180AbZBKMsY (ORCPT ); Wed, 11 Feb 2009 07:48:24 -0500 Date: Wed, 11 Feb 2009 13:48:02 +0100 From: Ingo Molnar To: Alok Kataria Cc: Jeremy Fitzhardinge , "H. Peter Anvin" , the arch/x86 maintainers , Zach Amsden , Rusty Russell , Rohit Jain , LKML , tj@kernel.org Subject: Re: [PARAVIRT/x86] BUGFIX: Put a missing paravirt_release_pmd in pgd_dtor Message-ID: <20090211124802.GI16535@elte.hu> References: <1233885731.29693.26.camel@alok-dev1> <498BA0CA.2040603@goop.org> <1233901043.8943.6.camel@alok-dev1> <498BDE1D.8030101@goop.org> <20090206145324.GF18368@elte.hu> <498C6CC9.5050302@goop.org> <1233944975.15269.14.camel@alok-dev1> <20090209121045.GF17782@elte.hu> <1234210794.16177.35.camel@alok-dev1> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1234210794.16177.35.camel@alok-dev1> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Alok Kataria wrote: > On Mon, 2009-02-09 at 04:10 -0800, Ingo Molnar wrote: > > > > > Applied to tip:x86/urgent, thanks guys! > > Thanks Ingo, > > I gave the tip tree a spin today and hit this bug. > > BUG: unable to handle kernel NULL pointer dereference at (null) > IP: [<(null)>] (null) > *pdpt = 0000000000839001 *pde = 0000000000c97067 *pte = 0000000000000163 > Oops: 0000 [#1] SMP > last sysfs file: > Modules linked in: > > Pid: 1, comm: swapper Not tainted (2.6.29-rc4-tip #18) VMware Virtual > Platform > EIP: 0062:[<00000000>] EFLAGS: 00010293 CPU: 0 > EIP is at 0x0 > EAX: 00000001 EBX: 00006000 ECX: c077ed00 EDX: 00006000 > ESI: 00000001 EDI: 00000001 EBP: ef04cf40 ESP: ef04cf1c > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 006a > Process swapper (pid: 1, ti=ef04c000 task=ef050000 task.ti=ef04c000) > Stack: > c0644e52 00000000 ef04cf24 ef04cf24 c064468d c0886dc0 00000000 c0702aea > ef055480 00000001 00000101 dead4ead ffffffff ffffffff c08af530 00000000 > c0709715 ef04cf60 ef04cf60 00000001 00000000 00000000 dead4ead ffffffff > Call Trace: > [] ? native_cpu_up+0x2de/0x45b > [] ? do_fork_idle+0x0/0x19 > [] ? _cpu_up+0x88/0xe8 > [] ? cpu_up+0x42/0x4e > [] ? kernel_init+0x99/0x14b > [] ? kernel_init+0x0/0x14b > [] ? kernel_thread_helper+0x7/0x10 > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 006a:ef04cf1c This is the crash fixed by your later genapic patch, right? > This happens with out the fix too. So was wondering if there is any > other known bug in the tip tree. > Also note that i synced to the mainline tree (29-rc4) and that works > fine. So this only exists in tip. > I will debug this later today, but if anyone has any ideas about this > bug do let me know. > > And ya i also had to apply this patch to get tip to compile. yes, that should be fixed too - it appeared briefly. Let me know if you can see any problems with the latest -tip tree. Ingo