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Received: from willy by casper.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1thKxf-0000000Edio-0SaD; Mon, 10 Feb 2025 03:59:55 +0000 Date: Mon, 10 Feb 2025 03:59:54 +0000 From: Matthew Wilcox To: Qu Wenruo Cc: Linux Memory Management List , linux-btrfs , "fstests@vger.kernel.org" Subject: Re: Btrfs crash on generic/437 on x86_64 Message-ID: References: <152296f3-5c81-4a94-97f3-004108fba7be@gmx.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspam-User: X-Rspamd-Queue-Id: F357B1C0015 X-Rspamd-Server: rspam07 X-Stat-Signature: ejqfyrr5hrttx1nd6h6cz9g9d98yjeok X-HE-Tag: 1739159996-728798 X-HE-Meta: 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 gEFQ5wlB DNe9u7W2mKvdWv8hEAYGcGA4FT3DMcN3D3m7HD0Wa1xrt/FvWjgv1Mnwu4yLz12oNgzXzCKfMGAzYP0SG0WFnULnDKgvCewdUM+1RPlD3JdA4M7pSP1dP/Z6FVIsT7xDz/8DmMPRML1zEDFiIPZDhkKdkimBih2X2BECSqt8mZe8MaXgQUhg1FSKWLEWidQfxMNt46of8VSFLYKc6Vo0TIFiR3sF4/awW14pqPEwdEkYiZnHJ/qHjgr2mtgdgvZBN7vrsnHkA+xXTnYTEzCbqj6YKdxdejMbwjtUOehB8bALmhZ6mVYBQKEzYU17tTewjZ4sjO1uuz1ewMkQg0+PddPHlM8k3xa6yaY7pglHvU59vtr6V9lwuKcsPjWvOwsSE4RPjijo8axusIys= 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 Mon, Feb 10, 2025 at 02:13:53PM +1030, Qu Wenruo wrote: > 在 2025/2/10 14:01, Matthew Wilcox 写道: > > > [ 58.305921] BTRFS info (device dm-0): using free-space-tree > > > [ 58.319296] run fstests generic/437 at 2025-02-10 13:24:19 > > > [ 59.283069] BUG: Bad rss-counter state mm:0000000048578720 > > > type:MM_FILEPAGES val:1 > > We need to figure out how we came to not unmap the page from the page > > tables originally. Looking through the merge log of the mm tree, my > > suspicion falls on the following patchsets: > > > > - "synchronously scan and reclaim empty user PTE pages" from Qi Zheng > > addresses an issue where "huge" amounts of pte pagetables are > > accumulated: https://lore.kernel.org/linux-mm/2766D04E-5A04-4BF6-A2A3-5683A3054973@nvidia.com/ looks like a similar splat with the problem narrowed down to the reclaim PTE pages patchset.