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Sep 2024 09:37:02 +0000 Message-ID: Date: Tue, 17 Sep 2024 11:36:51 +0200 User-Agent: Mozilla Thunderbird Subject: Re: Known and unfixed active data loss bug in MM + XFS with large folios since Dec 2021 (any kernel from 6.1 upwards) To: Matthew Wilcox Cc: Linus Torvalds , Dave Chinner , Jens Axboe , Christian Theune , linux-mm@kvack.org, "linux-xfs@vger.kernel.org" , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Dao , regressions@lists.linux.dev, regressions@leemhuis.info References: <0fc8c3e7-e5d2-40db-8661-8c7199f84e43@kernel.dk> <74cceb67-2e71-455f-a4d4-6c5185ef775b@meta.com> Content-Language: en-US From: Chris Mason In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MI2P293CA0004.ITAP293.PROD.OUTLOOK.COM (2603:10a6:290:45::15) To LV3PR15MB6455.namprd15.prod.outlook.com (2603:10b6:408:1ad::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR15MB6455:EE_|MW3PR15MB4058:EE_ 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 AC4tM2qM 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/17/24 5:32 AM, Matthew Wilcox wrote: > On Mon, Sep 16, 2024 at 10:47:10AM +0200, Chris Mason wrote: >> I've got a bunch of assertions around incorrect folio->mapping and I'm >> trying to bash on the ENOMEM for readahead case. There's a GFP_NOWARN >> on those, and our systems do run pretty short on ram, so it feels right >> at least. We'll see. > > I've been running with some variant of this patch the whole way across > the Atlantic, and not hit any problems. But maybe with the right > workload ...? > > There are two things being tested here. One is whether we have a > cross-linked node (ie a node that's in two trees at the same time). > The other is whether the slab allocator is giving us a node that already > contains non-NULL entries. > > If you could throw this on top of your kernel, we might stand a chance > of catching the problem sooner. If it is one of these problems and not > something weirder. > I was able to corrupt the xarray one time, hitting a crash during unmount. It wasn't the xfs filesystem I was actually hammering so I guess that tells us something, but it was after ~3 hours of stress runs, so not really useful. I'll try with your patch as well. -chris