From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 327A31AC45D for ; Sat, 22 Aug 2026 00:21:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787358095; cv=none; b=fZXHM0svPVqSRuH0lYLcVEZqRl0YWRszbO+ZpXXCFxrh318cz0IpPlZipA6iZZX6WA4KHs2/EQGzqHNN7qPij1ndm4zyTXyGHMKJCxgFQwMDtkNqZqKj87x3yz8suX7VKKhb3uf9Ym4rchMnMWytRM5X5pbrhW02BlGavhiH8Fg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787358095; c=relaxed/simple; bh=WFizjfAxtHtF8xDkLoONkOXrhTGRZZ9wr/S7KYlftjM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=NaAD5KzsO56rUkeozCkuUbpmZbGuycRXjlkP0tVoh2epM2ZjPfZBBkMgjKjKookZIV4R02Wo7Oi24xwuGFNVL6ZDA9nHgN6oIiOcKI6DSc1EuDeePnvA0hfkXfijMmW+/EEDqt0sXAIqtKetVVMY4NWSc5rufHir836aNkovu/Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.205 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f205.google.com with SMTP id 5614622812f47-4b28d7ffab1so2996279b6e.1 for ; Fri, 21 Aug 2026 17:21:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787358092; x=1787962892; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=KsVuteDhLbNXxIWA6TlR5etP4ibbciESS/QJt7a2Od0=; b=o6+9u8nVWYyHdb32tRHgGn3m3Z01w8i56WKWc/+nPdyfamAUsJLCcsh2MDBhCqlkx0 OAbYfkzokdxfA7w8NcqBBWP/ctvi5fu/ZZ8EMr/Ik4unizV+49+CG0Gp37IhPQRW0MY6 IEsqbyefTU+CWxZEo8YKjE4Ca1TpiztCWKaZkbHxWLEC4LwGo4yVAiIXw5YDx/OqtaG+ dDvpswSoW+n2id+eP7oxLYis+gEycrOpBGDIxmdYbPjS3yDN7CUUxQHsBxU67exCD+sl NLVssBJudndEK8s5X78qjKZOZXHR8UFUQPrXAWNOEagDgtHhS+Ei3NJmlpw6tGPFhtJv BDxA== X-Forwarded-Encrypted: i=1; AHgh+Rret/jegMemfZcInWY7zzIv/wIPhELSWfTWvtCRqu7UCt80sU4rv74TKVL3/4Nd2JR9btpKHL97fZp+vg==@vger.kernel.org X-Gm-Message-State: AFuF++m6de7faVASi+BycTL6+jpTnDpRu3Hx8LubBhrOEQ7DWvGi1j1k SKH8vXHd6t8IQIx0lnZFaC/IAVnCm49EYrUhs99mkFNO6eMymO/MwaO0mZucd6X5GlqvlL/kzBM 4GYj+T4b7JMBkvcqrS/HjBVvtP1CSR2bk2uFYKlZUFFc/br4KKGBj0I7w7jQ= Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1911:b0:4a4:989:bb1f with SMTP id 5614622812f47-4b2cdcc4f08mr18034459b6e.9.1787358091862; Fri, 21 Aug 2026 17:21:31 -0700 (PDT) Date: Fri, 21 Aug 2026 17:21:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a88eb8b.ae6ddae5.3da009.004b.GAE@google.com> Subject: [syzbot] [media?] WARNING in vb2_video_unregister_device From: syzbot To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, m.szyprowski@samsung.com, mchehab@kernel.org, syzkaller-bugs@googlegroups.com, tfiga@chromium.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4477a78374a5 Add linux-next specific files for 20260814 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15cda679580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5042554017b3879d dashboard link: https://syzkaller.appspot.com/bug?extid=f26bc23e42eeb548dee1 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d1a5728edb0d/disk-4477a783.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3aebe8202fcd/vmlinux-4477a783.xz kernel image: https://storage.googleapis.com/syzbot-assets/7e9f7367a2bd/bzImage-4477a783.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f26bc23e42eeb548dee1@syzkaller.appspotmail.com usb 3-1: Decoder not found em28xx 3-1:1.0: failed to create media graph em28xx 3-1:1.0: V4L2 device radio0 deregistered ------------[ cut here ]------------ !vdev->queue WARNING: drivers/media/common/videobuf2/videobuf2-v4l2.c:1264 at vb2_video_unregister_device+0x1f8/0x200 drivers/media/common/videobuf2/videobuf2-v4l2.c:1264, CPU#1: kworker/1:1/44 Modules linked in: CPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: events request_module_async RIP: 0010:vb2_video_unregister_device+0x1f8/0x200 drivers/media/common/videobuf2/videobuf2-v4l2.c:1264 Code: c6 28 4c 89 f0 48 c1 e8 03 80 3c 28 00 4c 8b 24 24 74 08 4c 89 f7 e8 97 0b 09 fa 49 c7 06 00 00 00 00 eb a6 e8 49 90 9a f9 90 <0f> 0b 90 e9 ae fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000b47990 EFLAGS: 00010293 RAX: ffffffff882d4ce7 RBX: 1ffff1100581b29b RCX: ffff888020ec9f40 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffff88802c0d953f R09: 1ffff1100581b2a7 R10: dffffc0000000000 R11: ffffed100581b2a8 R12: ffff88802bb40c00 R13: ffff88802c0d8000 R14: ffff88802c0d94d8 R15: ffff88802c0d8f38 FS: 0000000000000000(0000) GS:ffff8881249ab000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9b1ded3000 CR3: 000000000ed48000 CR4: 00000000003526f0 Call Trace: em28xx_v4l2_init+0x1c39/0x3150 drivers/media/usb/em28xx/em28xx-video.c:3085 em28xx_init_extension+0x120/0x1d0 drivers/media/usb/em28xx/em28xx-core.c:1248 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup