From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B5A9C87FD1 for ; Wed, 6 Aug 2025 07:56:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B30966B00B4; Wed, 6 Aug 2025 03:56:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B08406B00B5; Wed, 6 Aug 2025 03:56:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9F6EC6B00B6; Wed, 6 Aug 2025 03:56:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 90D066B00B4 for ; Wed, 6 Aug 2025 03:56:02 -0400 (EDT) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 402BB16041A for ; Wed, 6 Aug 2025 07:56:02 +0000 (UTC) X-FDA: 83745574164.26.F1DB25B Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf16.hostedemail.com (Postfix) with ESMTP id B164C180007 for ; Wed, 6 Aug 2025 07:55:59 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=YP6vGYOu; spf=pass (imf16.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1754466959; h=from:from:sender: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:dkim-signature; bh=DZLFNyU13X+JHer0jZ2QFk1zQ7UuPpmmQtBWGZ3YSq0=; b=xkWS8Sm+UA1GyKRLukz4QGkIlOPPWRiPhaoZ9ZPDVLNkZqPyfJEa2/HQJ4zemGVQO+4dHB AJ9iGaStxH+Q4eubyb4iX7BKE/Qk/wHzZ71oCrRDjbCvcGv8ZxswwdLsdU6lVJ0dXdow5r YiJfQIK5uS/QWfF+IfHvEFu+SXg1AMA= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1754466959; a=rsa-sha256; cv=none; b=zIgjoVv1DM3NuHotUxc+C9ownkRIRchu/bpapEVwydxZo7cxVYGEblDteXpBgo0M0RuK44 ZMOChcp6iyRXBhvk46k2oIpB19KagXqJ+lyfxd79q/pJ1yTGMjW6IblEJvcsMN/4cGOBwz SKc+qYv3Wlr5y6EtSH33WDJYXhp8Zzs= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=YP6vGYOu; spf=pass (imf16.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1754466959; 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=DZLFNyU13X+JHer0jZ2QFk1zQ7UuPpmmQtBWGZ3YSq0=; b=YP6vGYOuYQqrplzQqFkVbAySYS4arJ1cAjmyd6rgX6WVV6m/XMSKDUSqCFsesH1pBd0fD9 fO/56gU65czymqMmL9BI4coywYg5mc+Umqr7LdRdthNRBwl7+qVJ5VaS2e3c2olt7NDDOc iZOQWqequt+0C6XjDnzSVUNJy6fPkcQ= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-511-LrCifB75N_eqnYGVxVYGuA-1; Wed, 06 Aug 2025 03:55:57 -0400 X-MC-Unique: LrCifB75N_eqnYGVxVYGuA-1 X-Mimecast-MFC-AGG-ID: LrCifB75N_eqnYGVxVYGuA_1754466956 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-459d7ae12b8so21231435e9.1 for ; Wed, 06 Aug 2025 00:55:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754466956; x=1755071756; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:to:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=DZLFNyU13X+JHer0jZ2QFk1zQ7UuPpmmQtBWGZ3YSq0=; b=NfmsQJoEagC1XVehkhWaAacZoOy7jk/ej9YMprBW/uaaJfcoMTw2QzOaBFJNXQhtjC W45pW9SItVAEiTtw6q9Lt5a+SfHp7m+nCyNpDfE5tVHM2OwsGzPy3xWVGGQrSryK1/z1 uMZBrnSqLsH0z0CFuozbs/TKRCbCywm61XE+r0XM9wjxaiYVaVb4GueFy/Nnu7VXudJN F24ZCCltEBaAdtMORVuqRcmFLICHx2g/KzgeBSYb6K6kK+ZPBdIuVEGZGGttwZmnj/n+ DFm+Iotn5nAMNcPxUqE5C0N98fRTho8qH0Mxr4ov3VfqY6nre9KX2J/1d/53WlMD83PW FZTA== X-Forwarded-Encrypted: i=1; AJvYcCUHIV471CNga0zb/Gz5CLNqIWJdJOGmewalm818bHFXS/zDNGuQVFvYKgRpWH6DZqdb1pIwoaGGFA==@kvack.org X-Gm-Message-State: AOJu0YzN/2kRuMAf81xGorNVEWzE697ebvwk0K9Mc1+cZtD2b/KcIZAE AmTdbB8j4Je7NsgGrrg0mKeWIQUyk6HdMRJZCjCZ1xo+oQqBrNckFDn2BxKjSyKsAUub9DLJhir UYGXUVq+/0CRdZTnSQ7fKew3jux+vKhg+EzK7qU43RRECAdkMH5XMTaxFrs24+mo= X-Gm-Gg: ASbGnctHbWP0LzYdhtqFQaUJXXqUVB1EwJzruFltumCCPzSPfmL9aKeNX3udje3FXTb xAZ23ReY0nUyX8dOFFLjNnHERGDmUsEDbO23RStbkBXDtMY1RWULrcBMvwmNv09/qyyviAsRanB pOwkdMGuiC/WADqRNsUMDnK9tbtBPIIThV3CtlPxnnXn24UXx4SIHfU+cdlFCWs8Hn38FTO+ibC cyEoa6Bzzrni3WksqUbJ9HpKF8g/Xnge4vjmAoyZ5V9ZeR8c8z1N+65KTd2F8D9tGh39ziiqK2B A2SyNi0amfI+3l7XDLmBPoDeuoHDH5B2wwRPK/OZVW/1h9BTgqsMIlh2yNRziTUY9Tgh5Ao= X-Received: by 2002:a05:600c:b8d:b0:458:6733:fb43 with SMTP id 5b1f17b1804b1-459e70d810amr15082765e9.19.1754466956368; Wed, 06 Aug 2025 00:55:56 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHreEm/o70R+4VZDPuQwDE7mdbv00ibKdg9EKpHj1ehYh9wMi6gBd79ZjCe60Nx7uWZ1VDZqg== X-Received: by 2002:a05:600c:b8d:b0:458:6733:fb43 with SMTP id 5b1f17b1804b1-459e70d810amr15082535e9.19.1754466955963; Wed, 06 Aug 2025 00:55:55 -0700 (PDT) Received: from [192.168.3.141] (p4fe0ffa9.dip0.t-ipconnect.de. [79.224.255.169]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b8e1cb7deesm11542751f8f.2.2025.08.06.00.55.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 Aug 2025 00:55:55 -0700 (PDT) Message-ID: <50ad6ed2-2f4b-44b1-8b78-8eb3993834f0@redhat.com> Date: Wed, 6 Aug 2025 09:55:54 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in follow_page_pte To: syzbot , akpm@linux-foundation.org, jgg@ziepe.ca, jhubbard@nvidia.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, peterx@redhat.com, syzkaller-bugs@googlegroups.com References: <68930511.050a0220.7f033.003a.GAE@google.com> From: David Hildenbrand 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/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz 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+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: <68930511.050a0220.7f033.003a.GAE@google.com> X-Mimecast-Spam-Score: 1 X-Mimecast-MFC-PROC-ID: QjY0lDBWtc_B9K3uKODalx5YsaV1aiuV8DzI4VYz-XA_1754466956 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: B164C180007 X-Stat-Signature: cjd3g9mhqgjz7rbpsuosk9cpp6yf7cg3 X-Rspam-User: X-HE-Tag: 1754466959-306106 X-HE-Meta: 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 eLHlcHOQ 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 hfFqW/6Q F3D+LZwLRuOSJV6Vy2S6wxe6LXMvvtUemJjZZpDoQRYyb+tnAcqc33KYHit1kT0NIAxus5Ep0b9Yg2DEAWSG1DOTHdltT094Q9q08eWR4Z87fVdDpOFCrdKCUhVfubQE 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 06.08.25 09:32, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 7e161a991ea7 Merge tag 'i2c-for-6.17-rc1-part2' of git://g.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=16d385bc580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=75e522434dc68cb9 > dashboard link: https://syzkaller.appspot.com/bug?extid=57bcc752f0df8bb1365c > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13fa96a2580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1083c434580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/85ce789ac77a/disk-7e161a99.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/4d1fd8fed61a/vmlinux-7e161a99.xz > kernel image: https://storage.googleapis.com/syzbot-assets/9bd5f709ed6f/bzImage-7e161a99.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+57bcc752f0df8bb1365c@syzkaller.appspotmail.com > > do_initcall_level+0x104/0x190 init/main.c:1331 > do_initcalls+0x59/0xa0 init/main.c:1347 > kernel_init_freeable+0x334/0x4b0 init/main.c:1579 > kernel_init+0x1d/0x1d0 init/main.c:1469 > ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 5866 at mm/gup.c:869 follow_page_pte+0xe3c/0x13e0 mm/gup.c:868 That's the VM_WARN_ON_ONCE_PAGE((flags & FOLL_PIN) && PageAnon(page) && !PageAnonExclusive(page), page); [ 89.134725][ T5866] page: refcount:507 mapcount:1 mapping:0000000000000000 index:0x200000009 pfn:0x70809 [ 89.144633][ T5866] head: order:9 mapcount:505 entire_mapcount:0 nr_pages_mapped:505 pincount:2 [ 89.153655][ T5866] memcg:ffff88801b6f8000 [ 89.157938][ T5866] anon flags: 0xfff6000002007c(referenced|uptodate|dirty|lru|head|swapbacked|node=0|zone=1|lastcpupid=0x7ff) [ 89.170337][ T5866] raw: 00fff00000000000 ffffea0001c20001 dead000000000122 dead000000000400 [ 89.179013][ T5866] raw: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 89.188218][ T5866] head: 00fff6000002007c ffffea0001c52088 ffffea0001cc9988 ffff88807c250551 [ 89.196996][ T5866] head: 0000000200000000 0000000000000000 000001fbffffffff ffff88801b6f8000 [ 89.205866][ T5866] head: 00fff00000010a09 ffffea0001c20001 000001f9000001f8 00000002ffffffff [ 89.214719][ T5866] head: ffffffff000001f8 0000000000000015 0000000000000000 0000000000000200 So it's a pte-mapped THP, whereby the folio is pinned two times. The warning indicates that we likely have !exclusive anon page that is mapped writable into the page table. xdp_umem_pin_pages calls pin_user_pages(FOLL_WRITE | FOLL_LONGTERM). Let me dig, the reproducer seems to involve fork, io_uring, mprotect and setsockopt. -- Cheers, David / dhildenb