From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f4.google.com (mail-oi2-f4.google.com [74.125.231.196]) (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 518813AC0DC for ; Fri, 21 Aug 2026 07:41:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.196 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787298102; cv=none; b=kgi7SFvr7nCWWGfDeTR5cdrF6C3K+FEzUkCnFJihfg1k5ggB8wWF/6b0Y435WqBiNeGiHspNv7701IWRT+U5pIvIGziSfjPXi2NPUiQtI7lqOsT43lqixkJdSie5pXC5nTEA8h5qhJ1nsbtcLZTa9aZcxsRZ4W0dzGdifQAMl0o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787298102; c=relaxed/simple; bh=nmzWacGTHxKZE3ubY/KIjyNEZg1N+qDYx0gXTDWPrrA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=KrCou0Gwtx3VXouijvXAdEVcLCb7WYtYt0vOYpZ1MvkRMHpbHkZQPDGge/8XW/zlOEj0vlHkj0ExDwal2aL04ttxyO6nJxLw+fJbuQmWqyhbml60LTbeKpfVrUA9CA/TpDAuwGX7v9M/vy6r1GpLJ96PUMEwXXB/dKCSkt8BVGE= 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=74.125.231.196 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-oi2-f4.google.com with SMTP id 5614622812f47-4ab2d8e7e4cso229286b6e.1 for ; Fri, 21 Aug 2026 00:41:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787298094; x=1787902894; 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=eI9nUg0SS5Fmp+720Vhk6Ih5k4YhpZgUys0VSAyY1mc=; b=Ke7GwKyFHdXoNSMKvx5vA9gcjIGeTvOTC54Wva2mmRGFUAQ79eIEtZ1l603kohcTck tGD6853hD1CkHtYm1nyP8pATdq80PfQwrW8bzMxrJxheKwI+xgtPOezJFuv2SSctMk9n bfz4ScoIcmnkn1VCe4AsMyMZmWE4W8uMnQh7EU4WzdvJKeVeElh8z41cGdppyz2G3100 /xXZDwJKZn4+/F5pQoIiTTlXuO8sGX/ZUoORtM94wu9Mm2l+fOVIWlONmWhGisBwCd9V tVEmfUTOyF7TsYq1idV5i0JUN9X25Vy/DUuWfYDu44zLiFN1hWFQwIisif49YW/np6fZ PaDQ== X-Forwarded-Encrypted: i=1; AHgh+Rp14rT4FWckmhsuEiUJtvtyaplqjfgzRcE3y9bS2IGFhrAwpskGreu53goxh3d6W20CnPeaJr+HN+6UGg==@vger.kernel.org X-Gm-Message-State: AOJu0Yyaf+H6M84c53XXKUAs/+GB19s4fr+1E4XrKybd2+T9JQDFnZPl RKXKNMJh1K365k28M5aoG5qBsg5YcMotk/RgX0y2Ib3VuMX04Rl6XJymQHFLDHHXlWSN3lUTWa/ AW7iF6+haJ65UdSPBGTaFj4QkzH2s1Gwwh1pq6FWPd0I7j74FzsjiuXhA2N0= Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:5086:b0:495:fecb:bf9c with SMTP id 5614622812f47-4b2ef292b14mr4058043b6e.6.1787298094723; Fri, 21 Aug 2026 00:41:34 -0700 (PDT) Date: Fri, 21 Aug 2026 00:41:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a88012e.dbb3a75c.13dd47.0008.GAE@google.com> Subject: [syzbot] [media?] WARNING in vp702x_read_mac_addr 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: dcb68831eac7 Merge tag 'block-7.2-20260815' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15a4d949580000 kernel config: https://syzkaller.appspot.com/x/.config?x=65bd434865e8f85c dashboard link: https://syzkaller.appspot.com/bug?extid=477f9c41b0a7d90fb9cc compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-dcb68831.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2788b4793ff6/vmlinux-dcb68831.xz kernel image: https://storage.googleapis.com/syzbot-assets/28c6c79990ac/bzImage-dcb68831.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+477f9c41b0a7d90fb9cc@syzkaller.appspotmail.com dvbdev: DVB: registering new adapter (TwinhanDTV StarBox DVB-S USB2.0 (VP7021)) usb 6-1: media controller created ------------[ 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#1: kworker/1:2/1349 WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x947/0x1bd0 kernel/locking/mutex.c:821, CPU#1: kworker/1:2/1349 Modules linked in: CPU: 1 UID: 0 PID: 1349 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: usb_hub_wq hub_event 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 45 a7 66 05 45 85 f6 75 13 48 8d 3d 19 05 6a 05 48 c7 c6 a0 c8 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:ffffc90006ebec80 EFLAGS: 00010246 RAX: 0000000000000003 RBX: ffff8880253fe100 RCX: 1ffffffff2244970 RDX: 0000000000000000 RSI: ffffffff8bcfc8a0 RDI: ffffffff9125a960 RBP: ffffc90006ebedf0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888096ce7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f74382f0 CR3: 000000002a209000 CR4: 0000000000352ef0 Call Trace: vp702x_read_mac_addr+0x51/0x130 drivers/media/usb/dvb-usb/vp702x.c:297 dvb_usb_adapter_dvb_init+0x2dd/0x860 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:165 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:86 [inline] dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline] dvb_usb_device_init.cold+0xbd5/0x14bb drivers/media/usb/dvb-usb/dvb-usb-init.c:310 vp702x_usb_probe+0x8d/0x210 drivers/media/usb/dvb-usb/vp702x.c:342 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_new_device.part.0+0xcc2/0x1686 drivers/usb/core/hub.c:2703 usb_new_device include/linux/workqueue.h:714 [inline] hub_port_connect drivers/usb/core/hub.c:5575 [inline] hub_port_connect_change drivers/usb/core/hub.c:5715 [inline] port_event drivers/usb/core/hub.c:5879 [inline] hub_event.cold+0x1e3/0xe90 drivers/usb/core/hub.c:5961 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- 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 45 a7 66 05 mov 0x566a745(%rip),%r14d # 0x566a75c 17: 45 85 f6 test %r14d,%r14d 1a: 75 13 jne 0x2f 1c: 48 8d 3d 19 05 6a 05 lea 0x56a0519(%rip),%rdi # 0x56a053c 23: 48 c7 c6 a0 c8 cf 8b mov $0xffffffff8bcfc8a0,%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