Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752509AbbGNT0x (ORCPT ); Tue, 14 Jul 2015 15:26:53 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:53136 "EHLO e39.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751627AbbGNT0w (ORCPT ); Tue, 14 Jul 2015 15:26:52 -0400 X-Helo: d03dlp03.boulder.ibm.com X-MailFrom: paulmck@linux.vnet.ibm.com X-RcptTo: linux-kernel@vger.kernel.org Date: Tue, 14 Jul 2015 12:26:24 -0700 From: "Paul E. McKenney" To: Fabio Estevam Cc: Russell King , "linux-arm-kernel@lists.infradead.org" , Peter Zijlstra , rostedt@goodmis.org, linux-kernel Subject: Re: mx6: suspicious RCU usage Message-ID: <20150714192624.GO3717@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20150714160006.GI3717@linux.vnet.ibm.com> <20150714162600.GJ3717@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15071419-0033-0000-0000-00000527556A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1180 Lines: 28 On Tue, Jul 14, 2015 at 01:59:10PM -0300, Fabio Estevam wrote: > On Tue, Jul 14, 2015 at 1:44 PM, Fabio Estevam wrote: > > > With your patch applied I am running several suspend/resume cycles and > > I am seeing different problems now from time to time (like 1 out 10 > > times). The kernel dump does not look like the same every time, but > > here is one example: > > Here is another one I just got, and it seems to be more informative: > > http://pastebin.com/T4YxuLCg This might simply be a symptom of the earlier "Unable to handle kernel paging request at virtual address 708ebbfa". However, the usual cause of the later "rcu_read_lock() used illegally while idle!" is just that. In this case, might the interrupt have occurred without irq_enter() being invoked? (But there are probably two interleaved stack traces, and I am not certain that I am getting them untangled properly.) Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/