From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Andrzej Siewior Subject: Re: [4.1.15-rt17] BUG: unable to handle kernel NULL pointer dereference at 0000000000000001 Date: Thu, 4 Feb 2016 18:16:55 +0100 Message-ID: <20160204171655.GD3381@linutronix.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Cc: Linux RT Users To: Christoph Mathys Return-path: Received: from www.linutronix.de ([62.245.132.108]:39998 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754551AbcBDRQ4 (ORCPT ); Thu, 4 Feb 2016 12:16:56 -0500 Content-Disposition: inline In-Reply-To: Sender: linux-rt-users-owner@vger.kernel.org List-ID: * Christoph Mathys | 2015-12-23 14:55:08 [+0100]: >While running my "infamous" tests with containers[0] on 4.1, I get >system freezes regularly. I have tried with and without PREEMPT_RT. >The lockups did only occur on RT and when the cgroup "memory" was in >use. Without rt or this particular cgroup (cgroup_disable kernel >parameter), my test ran for ~15h before I stopped it manually. > >tldr; CONFIG_MEMCG seem to be broken for PREEMPT_RT. > >I don't know if the errors below are directly responsible for the >system freeze, but they are the last thing I see from the system >before it freezes. > >The second dump below might contain some typos because I had to >convert it manually from a screenshot to text. The memcg tests from LTP didn't cause any problems. And after about three hours trying to get lxc to work I gave up. So I have no idea how to continue here. >[0] http://www.spinics.net/lists/linux-rt-users/msg14262.html Sebastian