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 X-Spam-Level: X-Spam-Status: No, score=-3.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FCA5C433E5 for ; Tue, 30 Mar 2021 15:26:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B82B9619AB for ; Tue, 30 Mar 2021 15:26:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B82B9619AB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3706A6B0080; 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Tue, 30 Mar 2021 08:26:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=fCp4KYxji0+0j8ZYy/0qgF4qCzIC1ZnpH0/jKqXPGjI=; b=G5KGtgfRChZnWG9H7tFUxrQEYF04DN95adA7U5q/t9nuXLWNUo9nCgtD3EDjJa8DqK oVs5tREOVK5Fn94NflRVUD5TuGIRdeZua/Dy4Oil0+rSFw9+ShvrtJMoOqZlxXaAyVh0 131MHlMpFlNdl5I8WEg1bk2eQegAHuYrPKlusRyr7gFjLpt16sl92Oi9zkeQKVugA7Q6 qpmxhKCEpY6774Y2HtmbEjqaGzUQnIE1yN6OcGm/DzWWqgnLzMeYPQmMVhDi1Jd4cL6z gvDcrE6f3F3F/PW/RRxyZe05sAOHdyWTT7g0aovR2/f8XlhK4wSYPFQRRfj3Rrbxjj2K 8peA== X-Gm-Message-State: AOAM530/l7DG3Sh0NHndMY+bhS5Vc3oqybYr9csE4hJN2aVc4bEZ/C99 MijzzOpCqPbx4O+nJhBdF5t0kiLvYPq3yEZRFiyuMwxnPNWV X-Google-Smtp-Source: ABdhPJxHPgNEMqG7IieXHkAl/dlSLEJglxbo9HdtGSF31T5HbiUR0Dk82x2nwF5ECa0/SYnQvRxn4+eW3DppeXYAq5K63Yubx1yK MIME-Version: 1.0 X-Received: by 2002:a92:b05:: with SMTP id b5mr26351098ilf.240.1617117980562; Tue, 30 Mar 2021 08:26:20 -0700 (PDT) Date: Tue, 30 Mar 2021 08:26:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ca9a6005bec29ebe@google.com> Subject: [syzbot] WARNING in unsafe_follow_pfn From: syzbot To: akpm@linux-foundation.org, bp@alien8.de, daniel.vetter@ffwll.ch, daniel.vetter@intel.com, hpa@zytor.com, jmattson@google.com, jmorris@namei.org, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, m.szyprowski@samsung.com, mchehab@kernel.org, mingo@redhat.com, pbonzini@redhat.com, seanjc@google.com, serge@hallyn.com, syzkaller-bugs@googlegroups.com, tfiga@chromium.org, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 9F5FD4080F71 X-Stat-Signature: 1bqrcz9fc337hgcibhsyjqpw8maobi4i Received-SPF: none (m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com>: No applicable sender policy available) receiver=imf17; identity=mailfrom; envelope-from="<3HENjYAkbADkntufVggZmVkkdY.bjjbgZpnZmXjioZio.Xjh@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com>"; helo=mail-io1-f72.google.com; client-ip=209.85.166.72 X-HE-DKIM-Result: none/none X-HE-Tag: 1617117984-132674 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: Hello, syzbot found the following issue on: HEAD commit: 93129492 Add linux-next specific files for 20210326 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=169ab21ad00000 kernel config: https://syzkaller.appspot.com/x/.config?x=6f2f73285ea94c45 dashboard link: https://syzkaller.appspot.com/bug?extid=015dd7cdbbbc2c180c65 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119b8d06d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112e978ad00000 The issue was bisected to: commit d40b9fdee6dc819d8fc35f70c345cbe0394cde4c Author: Daniel Vetter Date: Tue Mar 16 15:33:01 2021 +0000 mm: Add unsafe_follow_pfn bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=122d2016d00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=112d2016d00000 console output: https://syzkaller.appspot.com/x/log.txt?x=162d2016d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+015dd7cdbbbc2c180c65@syzkaller.appspotmail.com Fixes: d40b9fdee6dc ("mm: Add unsafe_follow_pfn") ------------[ cut here ]------------ unsafe follow_pfn usage WARNING: CPU: 1 PID: 8426 at mm/memory.c:4807 unsafe_follow_pfn+0x20f/0x260 mm/memory.c:4807 Modules linked in: CPU: 0 PID: 8426 Comm: syz-executor677 Not tainted 5.12.0-rc4-next-20210326-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unsafe_follow_pfn+0x20f/0x260 mm/memory.c:4807 Code: 8b 7c 24 20 49 89 6d 00 e8 6e 84 64 07 e9 30 ff ff ff e8 f4 19 cb ff 48 c7 c7 40 1f 76 89 c6 05 56 eb 09 0c 01 e8 34 1a 21 07 <0f> 0b e9 71 fe ff ff 41 bc ea ff ff ff e9 06 ff ff ff e8 1a 65 0f RSP: 0018:ffffc9000161f660 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 1ffff920002c3ecc RCX: 0000000000000000 RDX: ffff88801954d580 RSI: ffffffff815c3fd5 RDI: fffff520002c3ebe RBP: ffff888023d56948 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815bd77e R11: 0000000000000000 R12: 0000000021000000 R13: ffff8880143a4010 R14: 0000000000000000 R15: 0000000000000110 FS: 00000000005d1300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f172c4cd6c0 CR3: 0000000011f70000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_vaddr_frames+0x337/0x600 drivers/media/common/videobuf2/frame_vector.c:72 vb2_create_framevec+0x55/0xc0 drivers/media/common/videobuf2/videobuf2-memops.c:50 vb2_vmalloc_get_userptr+0xce/0x4c0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:90 __prepare_userptr+0x342/0x15f0 drivers/media/common/videobuf2/videobuf2-core.c:1128 __buf_prepare+0x635/0x7d0 drivers/media/common/videobuf2/videobuf2-core.c:1367 vb2_core_qbuf+0xa9d/0x11c0 drivers/media/common/videobuf2/videobuf2-core.c:1658 vb2_qbuf+0x135/0x1a0 drivers/media/common/videobuf2/videobuf2-v4l2.c:820 vb2_ioctl_qbuf+0xfb/0x140 drivers/media/common/videobuf2/videobuf2-v4l2.c:1050 v4l_qbuf drivers/media/v4l2-core/v4l2-ioctl.c:2027 [inline] v4l_qbuf+0x92/0xc0 drivers/media/v4l2-core/v4l2-ioctl.c:2021 __video_do_ioctl+0xb94/0xe20 drivers/media/v4l2-core/v4l2-ioctl.c:2951 video_usercopy+0x253/0x1300 drivers/media/v4l2-core/v4l2-ioctl.c:3297 v4l2_ioctl+0x1b3/0x250 drivers/media/v4l2-core/v4l2-dev.c:366 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x443639 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffee3065668 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443639 RDX: 0000000020000140 RSI: 00000000c058560f RDI: 0000000000000004 RBP: 00000000004031e0 R08: 00000000004004a0 R09: 00000000004004a0 R10: 00236962762f7665 R11: 0000000000000246 R12: 0000000000403270 R13: 0000000000000000 R14: 00000000004b1018 R15: 00000000004004a0 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches