From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f197.google.com (mail-io0-f197.google.com [209.85.223.197]) by kanga.kvack.org (Postfix) with ESMTP id C33D56B0253 for ; Thu, 1 Dec 2016 07:50:44 -0500 (EST) Received: by mail-io0-f197.google.com with SMTP id g8so10750894ioi.0 for ; Thu, 01 Dec 2016 04:50:44 -0800 (PST) Received: from bh-25.webhostbox.net (bh-25.webhostbox.net. [208.91.199.152]) by mx.google.com with ESMTPS id r6si35286oih.169.2016.12.01.04.50.43 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 01 Dec 2016 04:50:43 -0800 (PST) Subject: Re: next: Commit 'mm: Prevent __alloc_pages_nodemask() RCU CPU stall ...' causing hang on sparc32 qemu References: <20161130012817.GH3924@linux.vnet.ibm.com> <20161130070212.GM3924@linux.vnet.ibm.com> <929f6b29-461a-6e94-fcfd-710c3da789e9@roeck-us.net> <20161130120333.GQ3924@linux.vnet.ibm.com> <20161130192159.GB22216@roeck-us.net> <20161130210152.GL3924@linux.vnet.ibm.com> <20161130231846.GB17244@roeck-us.net> <20161201011950.GX3924@linux.vnet.ibm.com> <20161201065657.GA4697@roeck-us.net> <20161201123409.GA3924@linux.vnet.ibm.com> From: Guenter Roeck Message-ID: Date: Thu, 1 Dec 2016 04:50:40 -0800 MIME-Version: 1.0 In-Reply-To: <20161201123409.GA3924@linux.vnet.ibm.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: paulmck@linux.vnet.ibm.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , sparclinux@vger.kernel.org, davem@davemloft.net On 12/01/2016 04:34 AM, Paul E. McKenney wrote: > On Wed, Nov 30, 2016 at 10:56:57PM -0800, Guenter Roeck wrote: >> Hi Paul, >> >> On Wed, Nov 30, 2016 at 05:19:50PM -0800, Paul E. McKenney wrote: >> [ ... ] >> >>>>>> >>>>>> BUG: sleeping function called from invalid context at mm/page_alloc.c:3775 >> [ ... ] >>> >>> Whew! You had me going for a bit there. ;-) >> >> Bisect results are here ... the culprit is, again, commit 2d66cccd73 ("mm: >> Prevent __alloc_pages_nodemask() RCU CPU stall warnings"), and reverting that >> patch fixes the problem. Good that you dropped it already :-). > > "My work is done." ;-) > > And apologies for the hassle. I have no idea what I was thinking when > I put the cond_resched_rcu_qs() there! > No worries. Cheers, Guenter -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org