Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763511AbXFAVXm (ORCPT ); Fri, 1 Jun 2007 17:23:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762816AbXFAVXe (ORCPT ); Fri, 1 Jun 2007 17:23:34 -0400 Received: from mail-gw1.sa.eol.hu ([212.108.200.67]:56467 "EHLO mail-gw1.sa.eol.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759746AbXFAVXd (ORCPT ); Fri, 1 Jun 2007 17:23:33 -0400 To: mingo@elte.hu CC: michal.k.k.piotrowski@gmail.com, linux-kernel@vger.kernel.org In-reply-to: <20070601130302.GA16172@elte.hu> (message from Ingo Molnar on Fri, 1 Jun 2007 15:03:02 +0200) Subject: Re: [1/3] 2.6.22-rc3: known regressions v2 References: <46600F1C.5000302@googlemail.com> <20070601130302.GA16172@elte.hu> Message-Id: From: Miklos Szeredi Date: Fri, 01 Jun 2007 23:23:20 +0200 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1291 Lines: 43 > i have no better ideas that what you already tried - but unfortunately > the tracer makes the bug go away and the NMI watchdog crashes your box. > Btw., nmi_watchdog=2 might have a higher chance of surviving (it can > still lock up a T60 but with a lower likelyhood). Good tip, nmi_watchdog=2 worked. Unlike the previous freezes, after this one it didn't continue after some minutes. Don't know if that's because the NMI oopser changed something, or if this is a slightly different lockup... No serial port on this laptop, so screenshot done with digicam: http://www.kernel.org/pub/linux/kernel/people/mszeredi/freeze/nmioops.jpg Here are the transcribed stack traces: CPU1 process: strace _spin_lock task_rq_lock wait_task_inactive ptrace_check_attach sys_ptrace CPU0 process: fusexmp_fh (this is one of several similar threads being straced) _spin_lock_irq schedule ptrace_stop ptrace_notify syscall_trace syscall_trace_enter tracesys Both these seem to be spinning on rq->lock, but who is holding this lock? Miklos - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/