Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750942AbdGYFUW (ORCPT ); Tue, 25 Jul 2017 01:20:22 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:40401 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750778AbdGYFUH (ORCPT ); Tue, 25 Jul 2017 01:20:07 -0400 Subject: Re: [linux-next] cpus stalls detected few hours after booting next kernel From: Abdul Haleem To: Nicholas Piggin Cc: sachinp , Stephen Rothwell , Paul McKenney , linux-kernel , linux-next , paulus@samba.org, paulmck@linux.vnet.ibm.com, linuxppc-dev Date: Tue, 25 Jul 2017 10:49:57 +0530 In-Reply-To: <20170630172802.6d4ddca2@roar.ozlabs.ibm.com> References: <1498728106.19484.21.camel@abdul> <20170629193614.376e27e6@roar.ozlabs.ibm.com> <20170629202305.6187367f@roar.ozlabs.ibm.com> <20170630004534.228f7c08@roar.ozlabs.ibm.com> <1498800138.19484.25.camel@abdul> <20170630172802.6d4ddca2@roar.ozlabs.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable x-cbid: 17072505-1617-0000-0000-000001F8BE18 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17072505-1618-0000-0000-0000484217DA Message-Id: <1500959997.27017.23.camel@abdul.in.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-25_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1706020000 definitions=main-1707250085 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1463 Lines: 50 On Fri, 2017-06-30 at 17:28 +1000, Nicholas Piggin wrote: > On Fri, 30 Jun 2017 10:52:18 +0530 > Abdul Haleem wrote: > > > On Fri, 2017-06-30 at 00:45 +1000, Nicholas Piggin wrote: > > > On Thu, 29 Jun 2017 20:23:05 +1000 > > > Nicholas Piggin wrote: > > > > > > > On Thu, 29 Jun 2017 19:36:14 +1000 > > > > Nicholas Piggin wrote: > > > > > > > > I don't *think* the replay-wakeup-interrupt patch is directly involved, but > > > > > it's likely to be one of the idle patches. > > > > > > Okay this turned out to be misconfigured sleep states I added for the > > > simulator, sorry for the false alarm. > > > > > > > Although you have this in the backtrace. I wonder if that's a stuck > > > > lock in rcu_process_callbacks? > > > > > > So this spinlock becomes top of the list of suspects. Can you try > > > enabling lockdep and try to reproduce it? > > > > Yes, recreated again with CONFIG_LOCKDEP=y & CONFIG_DEBUG_LOCKDEP=y set. > > I do not see any difference in trace messages with and without LOCKDEP > > enabled. > > > > Please find the attached log file. > > Can you get an rcu_invoke_callback event trace that Paul suggested? Yes, I have collected the perf report. > > Does this bug show up with just the powerpc next branch? Now started seeing the call trace on mainline too (4.13.0-rc2) > > Thanks, > Nick > -- Regard's Abdul Haleem IBM Linux Technology Centre