From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (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 D9DB7386579 for ; Tue, 4 Aug 2026 00:43:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785804204; cv=none; b=u9rco9H8EdP04D8biiXFfyYgVaJNymC8UolIAtnbHkE1Dd3OvhXD0I2+zC+ng4Us/kKh3QLOTj3ezge1+7gzJ9s7kwMIXotTpF3LNts8SKhAu3lAU65QtGP3Rr/XGhYoKG3U7+3Eub29UrI22Q1tscZcTaHsDYOsrcB6KkKrHLA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785804204; c=relaxed/simple; bh=SnVqgR+zk+hvDlCS+6/AhN/7PekfGtkmOD3jKdbf2A0=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=nj2hZzmpyIXYFi0+OrJbmqVESdULchN1ArAC8T2bZ7OORQuTrtz7p+dtzPuVwIUf+8XITG0n6ahUiCoxC6ZAA05f1KbGYC0U83+4qITQ8WZZinD7wG/N+h0WJuu8nih9q4UGS0X9a0XEbvUtCzVYXpevmWQKv6sRuxasSIIoNgo= 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=209.85.167.208 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-f208.google.com with SMTP id 5614622812f47-49ce04870f8so5287529b6e.0 for ; Mon, 03 Aug 2026 17:43:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785804202; x=1786409002; 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=BX7ehIJGJyfP49nhhzQHAYJfl5YPglkal10/oppx1Tw=; b=k5WU9NK044w701n8/STnldMmbU11Pb4zvi8Tg+pqSoveFrREjnqWsbLAQSiy/5pirn 2m4NdsV/y/jKu5IWjjxYuJsrv5+VNAxDt7hgZTNP0i0F4VXJY0Z+de0Cz95JY5eiOEZr xkWi8ccoO3SXucPibIAQSTg1fKVieBZNoAvz7c3oqklnvREbXups1/8bfU8cubrxEpPd v6/fEm8Bd+6rAZKM71W2MAxdK4TCCgWsgNKHJhgXx0RRXasNpHro98/8vQKP9i9ZlTlU Kk14nrTSajjWwJEWKXElwKYZbaGnxJrCdOIQ/REwVFjjZ5podCcBJBc6+C+yUC1afuJC xN+Q== X-Forwarded-Encrypted: i=1; AHgh+Rq3WRSPwbz/0ftWHwBcVoTMpCfhnpVjAZ9lLG5SP3+HqKwbjHK5fbJE2GpQg15aXNvMZ800EQxh3yl1Fw==@vger.kernel.org X-Gm-Message-State: AOJu0YxAnFf79+GR6jVyrayqYjr8igZnVjBOrTEJ0z6NekmW9ywgBY29 1AxnX+iYSbN+/GAp4BxI4E2+qw5F4hgNkUlOG+kAYjzjBU1UnwKD1xTu4OwMk8ZfvxdnYFaMN9p 4JhNs5mBGhDzOUsZojHwB0U2kwqSWQiOiAXjgE4hWAA3Mlr9vYSe6e8PLqyw= Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:2291:b0:490:315d:e0d5 with SMTP id 5614622812f47-4af5e251641mr18787129b6e.16.1785804201934; Mon, 03 Aug 2026 17:43:21 -0700 (PDT) Date: Mon, 03 Aug 2026 17:43:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7135a9.d35e88fd.de8b.0004.GAE@google.com> Subject: [syzbot] [media?] WARNING in as102_stream_ctrl From: syzbot To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 075b74841bd0 Linux 7.2-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1584d3b9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=ea047a32630b1f47da67 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1dc04730d019/disk-075b7484.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d76da42271f4/vmlinux-075b7484.xz kernel image: https://storage.googleapis.com/syzbot-assets/07b1cdbcbe45/bzImage-075b7484.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ea047a32630b1f47da67@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/mutex.c:625 [inline], CPU#0: syz.0.181/6386 WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x947/0x1bd0 kernel/locking/mutex.c:821, CPU#0: syz.0.181/6386 Modules linked in: CPU: 0 UID: 0 PID: 6386 Comm: syz.0.181 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline] RIP: 0010:__mutex_lock+0x94e/0x1bd0 kernel/locking/mutex.c:821 Code: 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 c6 10 00 00 44 8b 35 c5 b6 65 05 45 85 f6 75 13 48 8d 3d a9 14 69 05 48 c7 c6 00 d9 cf 8b <67> 48 0f b9 3a 90 e9 18 f8 ff ff 4d 8d a7 e8 0a 00 00 4c 89 e7 e8 RSP: 0018:ffffc900102cf670 EFLAGS: 00010246 RAX: 0000000000000003 RBX: ffff8880223a6010 RCX: 1ffffffff2245754 RDX: 0000000000000000 RSI: ffffffff8bcfd900 RDI: ffffffff91261890 RBP: ffffc900102cf7e0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007febfa3f06c0(0000) GS:ffff888123dd8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007febfa3efff8 CR3: 00000000551cb000 CR4: 00000000003526f0 Call Trace: as102_stream_ctrl+0x28/0xd0 drivers/media/usb/as102/as102_drv.c:259 dvb_frontend_open+0x220/0x16d0 drivers/media/dvb-core/dvb_frontend.c:2825 dvb_device_open+0x270/0x3b0 drivers/media/dvb-core/dvbdev.c:109 chrdev_open+0x234/0x6a0 fs/char_dev.c:411 do_dentry_open+0x6ab/0x14d0 fs/open.c:947 vfs_open+0x82/0x3f0 fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x2873/0x4280 fs/namei.c:4863 do_file_open+0x20e/0x430 fs/namei.c:4892 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7febfcd5e84e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007febfa3efb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007febfa3f06c0 RCX: 00007febfcd5e84e RDX: 0000000000000800 RSI: 00007febfa3efc00 RDI: ffffffffffffff9c RBP: 00007febfa3efc00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd R13: 00007febfd0264e8 R14: 00007febfd026450 R15: 00007ffd17b66708 ---------------- Code disassembly (best guess): 0: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx 4: 38 d0 cmp %dl,%al 6: 7c 08 jl 0x10 8: 84 d2 test %dl,%dl a: 0f 85 c6 10 00 00 jne 0x10d6 10: 44 8b 35 c5 b6 65 05 mov 0x565b6c5(%rip),%r14d # 0x565b6dc 17: 45 85 f6 test %r14d,%r14d 1a: 75 13 jne 0x2f 1c: 48 8d 3d a9 14 69 05 lea 0x56914a9(%rip),%rdi # 0x56914cc 23: 48 c7 c6 00 d9 cf 8b mov $0xffffffff8bcfd900,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 90 nop 30: e9 18 f8 ff ff jmp 0xfffff84d 35: 4d 8d a7 e8 0a 00 00 lea 0xae8(%r15),%r12 3c: 4c 89 e7 mov %r12,%rdi 3f: e8 .byte 0xe8 --- 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