From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751808Ab0JRCEf (ORCPT ); Sun, 17 Oct 2010 22:04:35 -0400 Received: from mail-fx0-f46.google.com ([209.85.161.46]:53196 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750921Ab0JRCEe (ORCPT ); Sun, 17 Oct 2010 22:04:34 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=pn9q2E1C6uZMVL05k2S0C4BXvtPWoR/tMQnoq1JvclOBCo0jIYzScJpCO2B03XjuEA 4yF9brIMwrJ9vAvQm/jw9skgV6MvWv0XT4bjUCwwZxSxIu2uRRlww3bP1drkgWpao7Yf /fg0fx9WAk4WDeEVybqwbEVrbCVmO96EVpMzI= Date: Mon, 18 Oct 2010 04:04:30 +0200 From: Frederic Weisbecker To: KOSAKI Motohiro Cc: Valdis.Kletnieks@vt.edu, Andrew Morton , Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, Peter Zijlstra Subject: Re: 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process Message-ID: <20101018020429.GB21722@nowhere> References: <20101018102609.3ADF.A69D9226@jp.fujitsu.com> <20101018013622.GA21722@nowhere> <20101018104259.3AE5.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20101018104259.3AE5.A69D9226@jp.fujitsu.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 18, 2010 at 11:01:18AM +0900, KOSAKI Motohiro wrote: > > On Mon, Oct 18, 2010 at 10:28:43AM +0900, KOSAKI Motohiro wrote: > > > > On Wed, 2010-10-06 at 05:32 -0400, Valdis.Kletnieks@vt.edu wrote: > > > > > Dell Latitude E6500, Intel Core2 Duo P8700 CPU. > > > > > > > > > > Have seen this three times now while trying to attach gdb to a hung Firefox > > > > > process. > > > > > > > > > > [20669.480674] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100 > > > > > [20669.480682] IP: [] __reserve_bp_slot+0x56/0x17d > > > > > > > > Known issue I think, Frederic was looking into curing this. > > > > > > > > Frederic, what's the current status of that? > > > > > > mmotm1014 seems still have this issue. Frederic, can you please tell us > > > current status if you are tracking this issue? > > > > > > Peter has a pending queue for .37 which includes: > > > > [RFC][PATCH 3/7] perf, hw_breakpoint: Fix crash in hw_breakpoint creation > > > > This patch should fix the issue (it depends on others in the queue). > > > > What is mmotm1014 BTW? Because you should see this bug only in a tree > > that has tip:/perf/core merged inside, like linux-next. > > mmotm is (usually) linux-next + akpm fixes. if a change of tip is exported > to linux-next, it is visible from mmotm tester :) Ok, thanks for the info :)