From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EB7251F91F6 for ; Thu, 5 Jun 2025 06:37:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749105447; cv=none; b=a148rdOrkjBTOkOKPBTyiizZ6G/USl+wFI7cXMHuItvtYJijO3mPptAj8KQf7H3SRokn4WW5657NeCq4d3BM1Q21OyjfQGG2J84AZL0UaNaqT6XnOMdQR1oaG6Okn6h1wMH4pye16beG+HQFUp70CClxJIQyDZuWuM4RZFUBGTI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749105447; c=relaxed/simple; bh=rDyOKtCQS8e7aGXgxvChEYdJZqGjA66bV7YpMtMh6dc=; h=Message-ID:Date:MIME-Version:Subject:From:To:References: In-Reply-To:Content-Type; b=Huj6Kgsnaq2s8uHrqtQ8UiDAr1gFSMvZKqJDcclhPsLrWUFy5+wwMxEX5YzHPBycqKovAddNAT9Gc0bDsgzANtRIt3nTTegmECaevQsAT+H/OSCGag0pL3sCN+yQKZMjAkmqyrJc21BRK5cVUsyhdtTJP/U2oFNGrABqnBm49DA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=StpzOx/L; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="StpzOx/L" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1749105444; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=qUNsKL2WG//LWRyl0dxuNhJtaytSDeJbo81cMVktrmg=; b=StpzOx/L6dOIWaGYUhrDWtrU/OESGNrt8p8lGXUVMl6PIhdIcLVlyiGWT847MUq4GkmVqU zXWbE1BssilOXbqU7YYf8OCnpg0+7yVD7pLMzvbZCUMdirK/LUFeSmcvg8Rm241UMdQVs7 378hBPgQHECP9/c4GZYVACCHjQpczEw= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-17-zsS_2yq-NcKggsOKgLqsbg-1; Thu, 05 Jun 2025 02:37:23 -0400 X-MC-Unique: zsS_2yq-NcKggsOKgLqsbg-1 X-Mimecast-MFC-AGG-ID: zsS_2yq-NcKggsOKgLqsbg_1749105442 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-450d64026baso2747655e9.1 for ; Wed, 04 Jun 2025 23:37:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749105442; x=1749710242; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:references:to:from:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=qUNsKL2WG//LWRyl0dxuNhJtaytSDeJbo81cMVktrmg=; b=HtdpgTYpARORO5YyqtUUUUX69hlIKml30TJoy5gwGG4mAPnKGvp//vQWxEv9vCjmeV BzrvW90RsNCBWBFwan55B6NXsntgwJIEKx8bKp5bLG0rk+9KRMFKk4yulkK2QkjDVQX5 f+Vq3EbhMKWZm4+WHlmGqwYtgO7OBtJzSKE3I7ML/MLyoDaU+ONjBOnjnKtLbD7vvQdK 3mnUg5QiK85w7R8kOsutnLE4EoRhVKhHXbco0nOAbDKWvcppDHRaEdetuutLNEvP51ln cEltxyW3KSiePWb5nwC1kX7pypvO72ag/SoJiVUnoq2Mup2ZNY4IqAEn5q8I3NuEpx+T 3LxQ== X-Forwarded-Encrypted: i=1; AJvYcCWmC6SPg1O+nxJ/Z5yCt7ikrfHKuyh2u0uqMBQX5eCGCvXCD8S3lgduJSoCpHYpZ9LQuuAZ21KaOoU5aJc=@vger.kernel.org X-Gm-Message-State: AOJu0YxWrDXg6b52oof5XSfLl/WPpZjamRFpL2CkgzOa35mu1V4xdnEL 9Uj4DBciW6SzhoTf2n3PC48DKIV3vcEc4ibzXtFd0UlMvOc6QfLnL+AHP6avT9a2XHL6DkiHdiS //u7sWrXdXPaGm756Jx1IkBLVHkY9m8LR1BetKddhaQTZKKOKcgDRJKNUp6Vv4ve6jg== X-Gm-Gg: ASbGncsZyzKKuh5W15u2aDhI/2shMovJPSQWN6VBhzANyeIg5FUR9MdPAppeLpc8dAV ZArtBCoRaLYtGxO88kR9omYCVpFuAHNc+95kQPRV8+KYUL55IKKaGLwY8TP9PHol/mMTLmc/JR9 JXwawIaLgob6LkjLL73YiOH8U/mCZc6FNokKnAa7RKn3gVUBrNH/rxql4Szl7s14b9+6JuUFKbC pwxnHwj5hgVshhBXCTaDA71yFoE9nmmjZqAFFvTCUBvw9kffK/xiFHiFGfpV2SRV4B8c7kG+hws 7pOzd2fzyH/HAgZpO7O8c04SS3X1dVn16yOybCu99/tBPayP1sbqK3vHQt134fEJA0ApWCYGWKf REv7jjE1EyTyELPckAMsAiICHBE6AxUj1hIg2 X-Received: by 2002:a05:600c:8b53:b0:450:d386:1afb with SMTP id 5b1f17b1804b1-451f0a77343mr52623635e9.9.1749105441990; Wed, 04 Jun 2025 23:37:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IG+f1lvX+Z3d8WumrJl3Iyi8gGNCfiBGN2gsZh5A6452LXk2A+DQXyVzXvsRVFg/Tior3zQjA== X-Received: by 2002:a05:600c:8b53:b0:450:d386:1afb with SMTP id 5b1f17b1804b1-451f0a77343mr52623295e9.9.1749105441591; Wed, 04 Jun 2025 23:37:21 -0700 (PDT) Received: from ?IPV6:2003:d8:2f27:ec00:4f4d:d38:ba97:9aa2? (p200300d82f27ec004f4d0d38ba979aa2.dip0.t-ipconnect.de. [2003:d8:2f27:ec00:4f4d:d38:ba97:9aa2]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-451fb1861d5sm7633885e9.17.2025.06.04.23.37.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Jun 2025 23:37:21 -0700 (PDT) Message-ID: Date: Thu, 5 Jun 2025 08:37:19 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] kernel BUG in try_to_unmap_one (2) From: David Hildenbrand To: syzbot , Liam.Howlett@oracle.com, akpm@linux-foundation.org, harry.yoo@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, riel@surriel.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, Jens Axboe , Catalin Marinas , Jinjiang Tu References: <68412d57.050a0220.2461cf.000e.GAE@google.com> <4fc2c008-2384-4d94-b1bf-f0a076585a4a@redhat.com> Content-Language: en-US Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 05.06.25 08:27, David Hildenbrand wrote: > On 05.06.25 08:11, David Hildenbrand wrote: >> On 05.06.25 07:38, syzbot wrote: >>> Hello, >>> >>> syzbot found the following issue on: >>> >>> HEAD commit: d7fa1af5b33e Merge branch 'for-next/core' into for-kernelci >> >> Hmmm, another very odd page-table mapping related problem on that tree >> found on arm64 only: > > In this particular reproducer we seem to be having MADV_HUGEPAGE and > io_uring_setup() be racing with MADV_HWPOISON, MADV_PAGEOUT and > io_uring_register(IORING_REGISTER_BUFFERS). > > I assume the issue is related to MADV_HWPOISON, MADV_PAGEOUT and > io_uring_register racing, only. I suspect MADV_HWPOISON is trying to > split a THP, while MADV_PAGEOUT tries paging it out. > > IORING_REGISTER_BUFFERS ends up in > io_sqe_buffers_register->io_sqe_buffer_register where we GUP-fast and > try coalescing buffers. > > And something about THPs is not particularly happy :) > Not sure if realted to io_uring. unmap_poisoned_folio() calls try_to_unmap() without TTU_SPLIT_HUGE_PMD. When called from memory_failure(), we make sure to never call it on a large folio: WARN_ON(folio_test_large(folio)); However, from shrink_folio_list() we might call unmap_poisoned_folio() on a large folio, which doesn't work if it is still PMD-mapped. Maybe passing TTU_SPLIT_HUGE_PMD would fix it. Likely the relevant commit is: commit 1b0449544c6482179ac84530b61fc192a6527bfd Author: Jinjiang Tu Date: Tue Mar 18 16:39:39 2025 +0800 mm/vmscan: don't try to reclaim hwpoison folio Syzkaller reports a bug as follows: Injecting memory failure for pfn 0x18b00e at process virtual address 0x20ffd000 Memory failure: 0x18b00e: dirty swapcache page still referenced by 2 users Memory failure: 0x18b00e: recovery action for dirty swapcache page: Failed page: refcount:2 mapcount:0 mapping:0000000000000000 index:0x20ffd pfn:0x18b00e memcg:ffff0000dd6d9000 anon flags: 0x5ffffe00482011(locked|dirty|arch_1|swapbacked|hwpoison|node=0|zone=2|lastcpupid=0xfffff) raw: 005ffffe00482011 dead000000000100 dead000000000122 ffff0000e232a7c9 raw: 0000000000020ffd 0000000000000000 00000002ffffffff ffff0000dd6d9000 page dumped because: VM_BUG_ON_FOLIO(!folio_test_uptodate(folio)) CCing Jinjiang Tu -- Cheers, David / dhildenb