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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1770234941; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=3jWcA/XbbO+nkeLoviAPOeZo3SWOiuXAuNDbD7xv21I=; b=z5mrWyb3mqmh8SxrcZigFfykWurBvbiKCY65J8r/Key4RoC5otzi1QOouTe8S9XN6hbGIp NLmiuYon67jFHjJg4lPB+0Dbhm9RFwLAqEjQVhGo7wyh0H9A8uN9SBOAqkNqFokplu0Vts 9gQbesQg9AMkNTwiz9/j/WluRbR+46w= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id D5DA360127; Wed, 4 Feb 2026 19:55:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CB4DC19424; Wed, 4 Feb 2026 19:55:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770234940; bh=E7SiYONFnBjZyoLuPb3bNROQr7xtT5319lNuGhJMu8U=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=FCY+qiQ4jz8dDXY72EcyNZPUNF02EHNKLhG2vxQVyys5/9sxJ1IWZQeFgKoLYTvrs zdbqN+Z/E8RRnZxAbIeReMV0Z5ALIBbAVTch0Sbz8tf6mfxCPuNZddiuTJbsivZ+G+ 2bFQce5bI811bwFJeqSsSDrlC54QF0cj40ncm8eb6gH531NKOK3gj97S8COgBDy0m9 mtuhegW+6ENj5FKKYkC29/wii9otBm89zTiOL7wc6gWVQmaobDcW+jAw6Eko6H7M8m hHpCMoNzMQJJAbsByeR4F2kY0ur+E6rtjimP9GsankPiOrOwMRHq6BOolx1C0Z9C41 Nxf4L+b7/5cdA== Message-ID: <11399c99-f966-47be-bbb4-a7d4e79c8c38@kernel.org> Date: Wed, 4 Feb 2026 20:55:36 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: WARNING in memory_failure() at include/linux/huge_mm.h:635 triggered To: Zi Yan Cc: =?UTF-8?B?5piv5Y+C5beu?= , linux-mm@kvack.org, linmiaohe@huawei.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Matthew Wilcox References: <1db245a8-f9ab-42e4-8cc6-cc7562961921@kernel.org> <48978612-6933-4897-85DD-6740B6C8570B@nvidia.com> <25CA4D90-A24E-49C6-92D2-08080EC81466@nvidia.com> <032058DC-CD8D-406A-B986-740E41C834B2@nvidia.com> <9E046323-740A-434A-8B60-B8A32D0955C0@nvidia.com> From: "David Hildenbrand (arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 8F9E1100009 X-Stat-Signature: 3sf9ptma4ht8xfyghiy97thkq9gude1f X-HE-Tag: 1770234941-950196 X-HE-Meta: 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 9DbWMrzq hse5WKmMou7npIkvH55raidakZJLJwlWyjAn7EGZsaQmNjtVh4EdUMxyIEBquSWGDy03+4oewV5Re+iLJeOgmAvJYQnrmyKYgr3AMqPtEkzXfum7ODYwJo7OQcc5mKMMch3pridf4udLWb7apRjg5x8ySB/O1Rb96b5ceOwxJAYb/oECMDzJpIdghuR2UtysoQlGvXYh2wzkkDYO3jPVSelGjhdk2JMcpn5j3J+yHXpGRisATz3i/sZohva3lUwr9pC5RnhiUe6XlqYNIlpQO4Bd6481DaI1BMDfbLTJyGldrvc4= 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 2/4/26 20:48, Zi Yan wrote: > On 4 Feb 2026, at 14:18, David Hildenbrand (arm) wrote: > >> On 2/4/26 18:41, Zi Yan wrote: >>> >>> >>> More details: >>> later at sg_vma_fault(), the driver just handles a page fault by supplying >>> a subpage from a pre-allocated compound page[3]. We then get a large folio >>> without !CONFIG_TRANSPARENT_HUGEPAGE. >> >> We can identify such non-folio (but compound) things by looking at PG_large_rmappable IIRC. > > What do you mean? Changing memory failure code to only handle large_rmappable? > large_rmappable is a folio flag, memory failure code should see such Did you mean "should not" ? :) > non-folio but compound things to begin with, IMHO. I would say that we could right now reject in memory failure code any compound pages that do not have PG_large_rmappable set. I have the faint recollection that we don't set PG_large_rmappable on hugetlb folios yet, so they have to identified as well. > > I think we need to be able to tell between raw page (compound or not), > mappable page (compound or not, especially for those used with vm_insert_*), > and folio. We can't identify (small) folios just yet. We'd need another page flag for that (just like PG_large_rmappable), and we all know how that ends ;) With Willy's work we'll be able to identify folios reliably. How to deal with that vm_insert_* crap, especially for non-folio pages, is also future work based on that. -- Cheers, David