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Mon, 17 Aug 2026 04:24:25 -0700 (PDT) Date: Mon, 17 Aug 2026 04:24:25 -0700 In-Reply-To: <6a708e5b.13bfb6d0.1ecdd5.027f.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a82ef69.f7a79266.2f965f.0028.GAE@google.com> Subject: Re: [syzbot] [media?] WARNING in v4l2_ctrl_cluster 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" Content-Transfer-Encoding: quoted-printable syzbot has found a reproducer for the following issue on: HEAD commit: 8d3ae59288f1 Linux 7.2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=3D13140679580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3D1d67342c314f228= d dashboard link: https://syzkaller.appspot.com/bug?extid=3D2d417475ba9d6d02c= fc9 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Deb= ian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D1315d949580000 IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+2d417475ba9d6d02cfc9@syzkaller.appspotmail.com usb 5-1: New USB device strings: Mfr=3D0, Product=3D0, SerialNumber=3D0 hackrf 5-1:1.0: Board ID: 02 hackrf 5-1:1.0: Firmware version: =02 ------------[ cut here ]------------ ncontrols =3D=3D 0 || controls[0] =3D=3D NULL WARNING: drivers/media/v4l2-core/v4l2-ctrls-core.c:2493 at v4l2_ctrl_cluste= r+0x1a1/0x230 drivers/media/v4l2-core/v4l2-ctrls-core.c:2493, CPU#0: kworke= r/0:1/10 Modules linked in: CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(fu= ll)=20 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:v4l2_ctrl_cluster+0x1a1/0x230 drivers/media/v4l2-core/v4l2-ctrls-= core.c:2493 Code: 03 38 d0 7c 08 84 d2 0f 85 88 00 00 00 0f b6 43 35 41 83 e7 01 41 c1 = e7 02 83 e0 fb 44 09 f8 88 43 35 eb 09 e8 e0 16 f2 f9 90 <0f> 0b 90 e8 d7 1= 6 f2 f9 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc900000d6f20 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff88185b47 RDX: ffff88801eeba540 RSI: ffffffff88185cc0 RDI: ffff88801eeba540 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000002 R14: ffff88802bff1628 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880d5bde000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc2c57dd58 CR3: 000000002b63c000 CR4: 0000000000352ef0 Call Trace: v4l2_ctrl_auto_cluster+0x4e/0x3a0 drivers/media/v4l2-core/v4l2-ctrls-core.= c:2515 hackrf_probe.cold+0x5f0/0x12ef drivers/media/usb/hackrf/hackrf.c:1430 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 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.