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s=arc-20220608; d=hostedemail.com; t=1726567815; a=rsa-sha256; cv=none; b=h2wWCmbVtHFpA5yc48S5m41izU3GAQRQHLerKkJzffB0qci8TliTUHWBgCa9Iyhpbq3o7/ /iYQqg6RvOaxLkhNSjTpkBMgvW3KBhwHRytWBdch1p/kWsyR55T8lxail5ujsfykXoUkWT q2Ax8aruOQ/IOc21OfbSnoYIxk8a61A= ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=pass header.d=flyingcircus.io header.s=mail header.b=EzeXgYQi; spf=pass (imf20.hostedemail.com: domain of ct@flyingcircus.io designates 212.122.41.197 as permitted sender) smtp.mailfrom=ct@flyingcircus.io; dmarc=pass (policy=reject) header.from=flyingcircus.io Content-Type: text/plain; charset=utf-8 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=flyingcircus.io; s=mail; t=1726567919; bh=cP8/Fn6tBfIOd+vH1Y/PmiZPk7CDO2/GsMaiS3P7iDk=; h=Subject:From:In-Reply-To:Date:Cc:References:To; b=EzeXgYQigjspo6b8ojyblK2LXyNnz6q359oHf3RoineE9bK9E7Wudt8oPLOJ+BLhc 2Z1DbBLSGQTsMKgscBSomb4WKaRw1SehOFcdLjOQLDsAfiEMi1tLOJyGsqjvvm3Gis SeFqs+atjmb2LoyAVoaPcUDKy1XgNJ/vYnmko5ns= Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3776.700.51\)) Subject: Re: Known and unfixed active data loss bug in MM + XFS with large folios since Dec 2021 (any kernel from 6.1 upwards) From: Christian Theune In-Reply-To: Date: Tue, 17 Sep 2024 12:11:37 +0200 Cc: Chris Mason , Linus Torvalds , Dave Chinner , Jens Axboe , 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 Content-Transfer-Encoding: quoted-printable Message-Id: <9256DE36-5885-41F3-B5C7-ED6BA286E063@flyingcircus.io> References: <0fc8c3e7-e5d2-40db-8661-8c7199f84e43@kernel.dk> <74cceb67-2e71-455f-a4d4-6c5185ef775b@meta.com> To: Matthew Wilcox X-Stat-Signature: 9hi3jf4c1aquw8xbfepdt1fs4qatu1n9 X-Rspamd-Queue-Id: 9895C1C0009 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1726567925-241947 X-HE-Meta: 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 Njjw6pE1 1na1yi0sq5vG6B0N3F+jZ0HILmtpvmcpiPSOoVvi++YDGJVigmdP71CgpnUrJwXMxhgvlXYeG5ebFDB5hhOnrj8kmlfNhzNqDO86Nt7E0D8TUsuyuLTKPO7QWMIW0o0c2t3L/qNd4qPKxeeGZ7Lpksbo5fcpo9rXxRdwfHmt13Pf8L6FHR7xAitwlT5l2EWd8lXBUVqo0s5kod13dU3RDIpjSNXRlJlmwex2bqC/TInfIk9u4y6hTw+B4AttB0CbojWMYFU6PcCMeAMbXncR4/xSvpxR+tfzB2j2z03bBwodVjnVqk5ieJY+zEUOqdQV48xFh7BGyriUxuMY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000012, 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 17. Sep 2024, at 11:32, Matthew Wilcox wrote: >=20 > 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. >=20 > 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 ...? I can start running my non-prod machines that were affected previously. = I=E2=80=99d run this on top of 6.11? Christian --=20 Christian Theune =C2=B7 ct@flyingcircus.io =C2=B7 +49 345 219401 0 Flying Circus Internet Operations GmbH =C2=B7 https://flyingcircus.io Leipziger Str. 70/71 =C2=B7 06108 Halle (Saale) =C2=B7 Deutschland HR Stendal HRB 21169 =C2=B7 Gesch=C3=A4ftsf=C3=BChrer: Christian Theune, = Christian Zagrodnick