From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f169.google.com (mail-ob0-f169.google.com [209.85.214.169]) by kanga.kvack.org (Postfix) with ESMTP id 0C3B56B0038 for ; Mon, 30 Nov 2015 19:58:23 -0500 (EST) Received: by obbbj7 with SMTP id bj7so142475402obb.1 for ; Mon, 30 Nov 2015 16:58:22 -0800 (PST) Received: from userp1040.oracle.com (userp1040.oracle.com. [156.151.31.81]) by mx.google.com with ESMTPS id w144si18811410oie.42.2015.11.30.16.58.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Nov 2015 16:58:22 -0800 (PST) Subject: Re: [PATCH] Fix a bdi reregistration race, v2 From: "Martin K. Petersen" References: <564F9AFF.3050605@sandisk.com> <20151124231331.GA25591@infradead.org> <5654F169.6070000@sandisk.com> <20151125084744.GA16429@infradead.org> <5655CCC0.9010107@sandisk.com> Date: Mon, 30 Nov 2015 19:57:35 -0500 In-Reply-To: <5655CCC0.9010107@sandisk.com> (Bart Van Assche's message of "Wed, 25 Nov 2015 06:59:12 -0800") Message-ID: MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Bart Van Assche Cc: Christoph Hellwig , James Bottomley , "Martin K. Petersen" , Jens Axboe , Tejun Heo , Jan Kara , Hannes Reinecke , Aaro Koskinen , "linux-scsi@vger.kernel.org" , linux-mm@kvack.org >>>>> "Bart" == Bart Van Assche writes: Bart, Bart> This race is hard to trigger. I can trigger it by repeatedly Bart> removing and re-adding SRP SCSI devices. Enabling debug options Bart> like SLUB debugging and kmemleak helps. I think that is because Bart> these debug options slow down the SCSI device removal code and Bart> thereby increase the chance that this race is triggered. Any updates on this? Your updated patch has no reviews. Should I just revert the original patch for 4.4? -- Martin K. Petersen Oracle Linux Engineering -- 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