From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gratian Crisan Subject: Re: unable to handle kernel NULL pointer dereference on 3.18.13-rt10 Date: Fri, 24 Jul 2015 15:21:18 -0500 Message-ID: <55B29E3E.9060200@ni.com> References: <453aa7881ded41e7a843795863ac1712@FE-MBX1012.de.bosch.com> <20150710132318.GA27402@linutronix.de> <55A36EF0.7020404@linutronix.de> <15fcff88e0b4417aba7fd635a98b1ad0@FE-MBX1012.de.bosch.com> <55A37DC9.6050604@linutronix.de> <55A607CC.3030808@etas.com> <12C1B74BDFD05D40B2356A9B12DFA3396C276FDBA2@KEBMXSPMB01.keba.co.at> <20150720145648.GA9559@linutronix.de> <12C1B74BDFD05D40B2356A9B12DFA3396C27797F4A@KEBMXSPMB01.keba.co.at> <20150722092635.0766400e@gandalf.local.home> <20150724152159.79543722@gandalf.local.home> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: "Koehrer Mathias (ETAS/ESW5)" , eg Engleder Gerhard , Sebastian Andrzej Siewior , "linux-rt-users@vger.kernel.org" To: Steven Rostedt , Thomas Gleixner Return-path: Received: from skprod3.natinst.com ([130.164.80.24]:45753 "EHLO ni.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753030AbbGXUVp (ORCPT ); Fri, 24 Jul 2015 16:21:45 -0400 In-Reply-To: <20150724152159.79543722@gandalf.local.home> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On 07/24/2015 02:21 PM, Steven Rostedt wrote: > On Fri, 24 Jul 2015 21:02:26 +0200 (CEST) > Thomas Gleixner wrote: > >> On Wed, 22 Jul 2015, Steven Rostedt wrote: >>> It's still there. Note, that when I pull -rt into stable, I do a >>> git quiltimport, which renames the patch set. It's now called: >>> >>> 0089-slub-delay-ctor-until-the-object-is-requested.patch >> >> >From the 4.0.8-rt6 announce: >> >> - The delayed kmem_cache constructor caused problems. Steven Rostedt >> reported problems versus the signal handling code and Koehrer >> Mathias reported the same. The patch in question has been reverted >> and a patch currently sitting in -mm has been added which provides >> the same functionality (running the constructor with enabled >> interrupts). Patch provided by Thomas Gleixner. >> >> The stable trees which carry the delay-ctor patches should be updated >> to this. >> >> Reverting the patch at least prevents the BUG. Latencywise the slub patch >> >> mm-slub-move-slab-initialization-into-irq-enabled-re.patch >> >> is the one which wants to be ported back. >> > > OK, thanks. > > Just to let people know. I'm going to be traveling next week and when I > get back in August, my top priority is to work on the stable patches. > For 3.18, I'll be looking at the patches that have been emailed to the > list, and I want to fix NO_HZ for 3.10-3.14. > In case it saves you some work, we've had some success getting NO_HZ to work on 3.14 (x86_64) after back-porting the following commit: 3010279f0fc36f0388872203e63ca49912f648fd x86: Tell irq work about self IPI support -Gratian