From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755823AbYGWUww (ORCPT ); Wed, 23 Jul 2008 16:52:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754138AbYGWUwo (ORCPT ); Wed, 23 Jul 2008 16:52:44 -0400 Received: from wf-out-1314.google.com ([209.85.200.175]:13852 "EHLO wf-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753508AbYGWUwn (ORCPT ); Wed, 23 Jul 2008 16:52:43 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=ZsGSyhMnuIO314OdXZvnYt3smRLR0L1CgB9XtQus4XHzTojGhlWa+0zeDdB2hCw9Em oaBVdSM79GuvOgaAotcrXuP0i/rPd1CkybqZ7am17uklYyee8WAlLQ5IdSi8+FGOGo8h fJH+/D0kQpWQtuxAyygByq3wt+5SMQ+v6mGDA= Message-ID: <19f34abd0807231352j1ba1414am84ee9683df9b5657@mail.gmail.com> Date: Wed, 23 Jul 2008 22:52:43 +0200 From: "Vegard Nossum" To: "Suresh Siddha" Subject: Re: recent -git: BUG in free_thread_xstate Cc: LKML , "the arch/x86 maintainers" , "Paul E. McKenney" In-Reply-To: <20080723203109.GH14380@linux-os.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <19f34abd0807231307y191c0ad7tfab4cda57ee88eb@mail.gmail.com> <20080723203109.GH14380@linux-os.sc.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 23, 2008 at 10:31 PM, Suresh Siddha wrote: > On Wed, Jul 23, 2008 at 01:07:04PM -0700, Vegard Nossum wrote: >> Hi, >> >> I just got this on c010b2f76c3032e48097a6eef291d8593d5d79a6 (-git from >> yesterday): > > Do you see this in 2.6.26 aswell? I suspect it is coming from post 2.6.26 > changes. > Humm... I got something different now on plain 2.6.26: ------------[ cut here ]------------ WARNING: at kernel/sched_fair.c:815 hrtick_start_fair+0x158/0x170() Pid: 5575, comm: migration/1 Not tainted 2.6.26 #1 [] warn_on_slowpath+0x4f/0x70 [] ? native_sched_clock+0xb5/0x110 [] ? update_curr_rt+0x10e/0x450 [] ? _spin_unlock+0x27/0x50 [] ? update_curr_rt+0x10e/0x450 [] ? __dequeue_entity+0x2a/0xa0 [] hrtick_start_fair+0x158/0x170 [] pick_next_task_fair+0x5f/0x70 [] schedule+0x148/0x850 [] ? _spin_unlock_irq+0x22/0x60 [] ? trace_hardirqs_on+0xd4/0x160 [] migration_thread+0x132/0x240 [] ? complete+0x49/0x60 [] ? migration_thread+0x0/0x240 [] kthread+0x42/0x70 [] ? kthread+0x0/0x70 [] kernel_thread_helper+0x7/0x14 ======================= ---[ end trace 3e4aafeba0960600 ]--- BUG: unable to handle kernel paging request at c0804358 IP: [] schedule+0x1ed/0x850 *pde = 3780e163 *pte = 00804162 Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Pid: 5575, comm: migration/1 Tainted: G W (2.6.26 #1) EIP: 0060:[] EFLAGS: 00010086 CPU: 1 EIP is at schedule+0x1ed/0x850 EAX: c0803f00 EBX: 00000001 ECX: f4d10000 EDX: 00450008 ESI: f4c91fe0 EDI: c0803f00 EBP: f4c85fa0 ESP: f4c85f3c DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Process migration/1 (pid: 5575, ti=f4c84000 task=f6348000 task.ti=f4c84000) Stack: ef927c97 f63484b8 f6348000 f63484b8 c08ba810 f6348000 c1fb3f00 f4c91fe0 00000000 00000000 f6348000 f6348274 c1fb3f00 f4c84000 00000000 f6348000 c0581582 c1fb3f00 f4c85f94 c0157a24 c1fb3f00 00000001 c1fb4378 00000001 Call Trace: [] ? _spin_unlock_irq+0x22/0x60 [] ? trace_hardirqs_on+0xd4/0x160 [] ? migration_thread+0x132/0x240 [] ? complete+0x49/0x60 [] ? migration_thread+0x0/0x240 [] ? kthread+0x42/0x70 [] ? kthread+0x0/0x70 [] ? kernel_thread_helper+0x7/0x14 ======================= Code: c0 0f 84 40 02 00 00 8b 86 48 04 00 00 39 45 b8 0f 84 ad 00 00 00 8b 75 b8 b8 00 3f 80 c0 8b 4e 04 8b 51 10 03 04 95 00 af 75 c0 <8b> b0 58 04 00 00 8b 98 54 04 00 00 89 75 c0 8b 75 b8 89 5d bc EIP: [] schedule+0x1ed/0x850 SS:ESP 0068:f4c85f3c ---[ end trace 3e4aafeba0960600 ]--- note: migration/1[5575] exited with preempt_count 2 I'll give it a few more tries to see if it can come up with the same thing as before. Vegard -- "The animistic metaphor of the bug that maliciously sneaked in while the programmer was not looking is intellectually dishonest as it disguises that the error is the programmer's own creation." -- E. W. Dijkstra, EWD1036