WARNING in smsusb_stop_streaming (2)

Status: upstream: reported on 2026/07/08 14:11
Subsystems: media
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+0927fcf047387215ed98@syzkaller.appspotmail.com
First crash: 53d, last: 53d
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
1b237248 repro-c Reproduced: ✅ ❓ WARNING in smsusb_stop_streaming (2) 2026/08/26 14:05 2026/08/26 15:04 2026/08/26 17:23 a2b77b9e
654b001f assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in smsusb_stop_streaming (2) 2026/07/06 00:02 2026/07/06 00:02 2026/07/06 00:33 93f57954
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [media?] WARNING in smsusb_stop_streaming (2) 0 (1) 2026/07/08 14:11
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in smsusb_stop_streaming prio:high media -1 12 128d 184d 0/29 auto-obsoleted due to no activity on 2026/07/04 04:30
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/08/26 18:29 nogikh@google.com git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 818bebeb63dd6bf5f4e07e145f6cdbace520a34c running

Sample crash report:
------------[ cut here ]------------
data & WORK_STRUCT_PWQ
WARNING: kernel/workqueue.c:4351 at __flush_work+0xb75/0xcb0 kernel/workqueue.c:4351, CPU#0: kworker/0:0/9
Modules linked in:
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:__flush_work+0xb75/0xcb0 kernel/workqueue.c:4351
Code: 01 e8 bf d3 11 00 e9 bf fd ff ff 48 8b 7c 24 18 e8 00 5f 9e 00 e9 f7 f6 ff ff e8 f6 5e 9e 00 e9 09 fa ff ff e8 fc 03 36 00 90 <0f> 0b 90 e9 38 fc ff ff e8 0e 5f 9e 00 e9 2d fb ff ff 48 89 df e8
RSP: 0018:ffffc9000009ebd0 EFLAGS: 00010246
RAX: 0000000000100000 RBX: ffff8881000ba405 RCX: ffffc9000fb4e000
RDX: 0000000000100000 RSI: ffffffff817e05c4 RDI: ffff888101afda00
RBP: 0000000000000004 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff817dff1a
R13: ffff88810006b000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888268640000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f57d5145d58 CR3: 000000011669a000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 __cancel_work_sync kernel/workqueue.c:4494 [inline]
 cancel_work_sync+0xd1/0xf0 kernel/workqueue.c:4531
 smsusb_stop_streaming+0xaa/0x210 drivers/media/usb/siano/smsusb.c:183
 smsusb_term_device+0x8f/0x200 drivers/media/usb/siano/smsusb.c:345
 smsusb_init_device+0xb4e/0xbb0 drivers/media/usb/siano/smsusb.c:497
 smsusb_probe+0xd7f/0xe1f drivers/media/usb/siano/smsusb.c:575
 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.cold+0x685/0x115c drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953
 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+0x69a/0xc80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/04 14:09 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing dc59e4fea9d8 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb WARNING in smsusb_stop_streaming
* Struck through repros no longer work on HEAD.