From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Rostedt Subject: Re: [PATCH] rtmutex.c: Fix incorrect waiter check Date: Mon, 17 Aug 2015 10:40:51 -0400 Message-ID: <20150817104051.6b194df0@grimm.local.home> References: <548F7E4C.90805@hp.com> <1421269898-30591-1-git-send-email-brad.mouring@ni.com> <1421269898-30591-2-git-send-email-brad.mouring@ni.com> <20150121151352.7e4ef150@gandalf.local.home> <12C1B74BDFD05D40B2356A9B12DFA3396C2A5F752B@KEBMXSPMB01.keba.co.at> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: "linux-rt-users@vger.kernel.org" , Sebastian Andrzej Siewior To: eg Engleder Gerhard Return-path: Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.225]:9125 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750975AbbHQOlD (ORCPT ); Mon, 17 Aug 2015 10:41:03 -0400 In-Reply-To: <12C1B74BDFD05D40B2356A9B12DFA3396C2A5F752B@KEBMXSPMB01.keba.co.at> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Mon, 17 Aug 2015 12:41:47 +0200 eg Engleder Gerhard wrote: > Hello Steven, > > I had the following problem with 3.2.68-rt99: > <1>[ 1615.388250] BUG: unable to handle kernel NULL pointer dereference at 0000002d > <1>[ 1615.388261] IP: [] task_blocks_on_rt_mutex+0x126/0x240 > > We could reproduce it rather good, 2 times BUG out of 4 tries. Sebastian pointed > me to the patch below. 8 times no BUG out of 8 tries with the patch now. As Sebastian > is not available currently, I thought I should let you know. Could you add this patch > to 3.2.69-rt102? > Yes, I'm the one to apply it to 3.2-rt, as Sebastian is responsible for the development branch and I'm responsible for the stable tree. I'm currently at LinuxCon, but I'll see if I can get this done sometime while I watch the key notes. That's usually when I get the most work done during a conference ;-) -- Steve