From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758503AbYEKT7E (ORCPT ); Sun, 11 May 2008 15:59:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755336AbYEKT6y (ORCPT ); Sun, 11 May 2008 15:58:54 -0400 Received: from mga12.intel.com ([143.182.124.36]:28340 "EHLO azsmga102.ch.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755155AbYEKT6x (ORCPT ); Sun, 11 May 2008 15:58:53 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.27,469,1204531200"; d="scan'208";a="245255498" Message-ID: <48274FF2.8040202@linux.intel.com> Date: Sun, 11 May 2008 12:58:42 -0700 From: Arjan van de Ven User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) MIME-Version: 1.0 To: Vegard Nossum CC: Ingo Molnar , Linux Kernel Mailing List Subject: Re: Error in save_stack_trace() on x86_64? References: <19f34abd0805110609lf3180dm3b1078e373983ad7@mail.gmail.com> <48274C9E.3020608@linux.intel.com> <19f34abd0805111256q29055475leb329179034df20c@mail.gmail.com> In-Reply-To: <19f34abd0805111256q29055475leb329179034df20c@mail.gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Vegard Nossum wrote: in userspace this trace looks correct. > > No, it is happening from kernel code. As you can see from the original > backtrace, the regs->ip (RIP) (regs taken from the very same > do_page_fault()) points at add_uevent_var, which is a kernel function. > >> if it happens in kernel space... I wonder if the separate exception stack >> thing >> is hurting us with the stacks not being properly connected... >> (but oopses and the like seem to come out just fine so I kinda doubt you're >> hitting that) >> > > Thanks for looking into this. > do you happen to have something that I maybe can reproduce? (if you have that it would save me a ton of time in reproducing) > > Vegard >