Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755087Ab3JHI0b (ORCPT ); Tue, 8 Oct 2013 04:26:31 -0400 Received: from mail-ee0-f51.google.com ([74.125.83.51]:38733 "EHLO mail-ee0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751894Ab3JHI02 (ORCPT ); Tue, 8 Oct 2013 04:26:28 -0400 Date: Tue, 8 Oct 2013 10:26:24 +0200 From: Ingo Molnar To: Fengguang Wu Cc: Linus Torvalds , Russell King - ARM Linux , xen-devel@lists.xenproject.org, Linux Kernel Mailing List , Greg Kroah-Hartman Subject: Re: [xen] double fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Message-ID: <20131008082624.GC7232@gmail.com> References: <20131006082340.GA24568@localhost> <20131007021118.GA27927@localhost> <20131007051038.GA9764@localhost> <20131007083505.GA22585@localhost> <20131008075816.GA6346@gmail.com> <20131008082057.GA19657@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131008082057.GA19657@localhost> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1314 Lines: 28 * Fengguang Wu wrote: > After enabling CONFIG_DEBUG_OBJECTS_TIMERS=y, it will issue a WARNING followed by a "BUG: ..." Cool! > [ 2.802167] parport_pc 00:04: reported by Plug and Play ACPI > [ 2.803818] parport0: PC-style at 0x378, irq 7 [PCSPP(,...)] > [ 2.806035] kobject: 'parport_pc.956' (ffff880006dc3820): kobject_release, parent (null) (delayed) > [ 2.808626] ------------[ cut here ]------------ > [ 2.809776] WARNING: CPU: 1 PID: 1 at /c/wfg/linux/lib/debugobjects.c:260 debug_print_object+0x7c/0x8d() > [ 2.812433] ODEBUG: init active (active state 0) object type: timer_list hint: (null) > ...... > [ 3.796079] BUG: unable to handle kernel NULL pointer dereference at (null) Mind posting the full backtrace? It should show the actual callsite that zaps the timer. I don't think we got that dump so far, I've only seen timer list corruption backtraces. (but I haven't read the whole thread.) Thanks, Ingo -- 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/