From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752599Ab1KFNkl (ORCPT ); Sun, 6 Nov 2011 08:40:41 -0500 Received: from mail.anarazel.de ([217.115.131.40]:52485 "EHLO mail.anarazel.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752183Ab1KFNkk (ORCPT ); Sun, 6 Nov 2011 08:40:40 -0500 From: Andres Freund To: Gleb Natapov Subject: Re: 3.1: NULL pointer dereference after perf usage Date: Sun, 6 Nov 2011 14:40:30 +0100 User-Agent: KMail/1.13.7 (Linux/3.1.0-andres-dirty; KDE/4.6.5; x86_64; ; ) Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Arnaldo Carvalho de Melo , Paul Mackerras , Peter Zijlstra References: <201111060358.59430.andres@anarazel.de> <20111106091229.GB3225@redhat.com> In-Reply-To: <20111106091229.GB3225@redhat.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201111061440.31714.andres@anarazel.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Sunday, November 06, 2011 10:12:29 AM Gleb Natapov wrote: > On Sun, Nov 06, 2011 at 03:58:59AM +0100, Andres Freund wrote: > > Somewhere in the 3.1 cycle - haven't yet bisected - I started to get > > somewhat reprodcable crashes after using perf. > > There is no direct correlation with a concrete action via perf I can > > see so far but without having used perf the system runs stable. > > Can you try those patches please? > https://lkml.org/lkml/2011/10/23/163 > https://lkml.org/lkml/2011/10/18/390 After applying those the system runs smoothly - while using perf obviously - for over an hour. Thanks, Andres