WARNING in smsusb_term_device (2)

Status: upstream: reported C repro on 2026/10/05 05:17
Subsystems: media usb
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+d627b1495de0e851be32@syzkaller.appspotmail.com
First crash: 15h03m, last: 15h03m
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
f24220b6 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in smsusb_term_device (2) 2026/10/05 00:47 2026/10/05 00:47 2026/10/05 01:43 57bbd979
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [media?] [usb?] WARNING in smsusb_term_device (2) 0 (1) 2026/10/05 05:17
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in smsusb_term_device origin:upstream -1 syz, C error 37 212d 461d 0/2 upstream: reported C repro on 2025/06/30 17:38
linux-6.1 WARNING in smsusb_term_device -1 syz, C done 131 1175d 1296d 3/3 fixed on 2023/09/27 12:10
upstream WARNING in smsusb_term_device usb media -1 syz, C done 983 1171d 1321d 0/29 auto-obsoleted due to no activity on 2023/09/30 04:06
linux-5.15 WARNING in smsusb_term_device -1 syz, C error 124 1171d 1296d 0/3 auto-obsoleted due to no activity on 2023/09/30 15:31
▶ ▼ Cause bisection attempts (1)
Created Duration User Patch Repo Result
2026/10/05 11:53 bisect upstream running

Sample crash report:
smsusb:smsusb_init_device: smscore_start_device(...) failed
------------[ cut here ]------------
data & WORK_STRUCT_PWQ
WARNING: kernel/workqueue.c:4425 at __flush_work+0xc8f/0xd70 kernel/workqueue.c:4425, CPU#1: kworker/1:4/5659
Modules linked in:
CPU: 1 UID: 0 PID: 5659 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:__flush_work+0xc8f/0xd70 kernel/workqueue.c:4425
Code: 38 00 90 0f 0b 90 31 c0 49 bd f8 f8 f8 f8 f8 f8 f8 f8 e9 2d ff ff ff e8 7f 24 38 00 4d 89 f4 e9 ee fa ff ff e8 72 24 38 00 90 <0f> 0b 90 e9 23 fd ff ff e8 a4 60 ca 09 e8 5f 24 38 00 48 c7 c7 80
RSP: 0018:ffffc900051ce960 EFLAGS: 00010293
RAX: ffffffff818eb3be RBX: ffff88813fe4a005 RCX: ffff88803a410000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900051ceb18 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f64590 R12: dffffc0000000000
R13: f8f8f8f8f8f8f8f8 R14: 1ffff92000a39d34 R15: ffffc900051cea08
FS:  0000000000000000(0000) GS:ffff888125cc2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0e9993643c CR3: 0000000045a10000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __cancel_work_sync+0xbf/0x110 kernel/workqueue.c:4568
 smsusb_stop_streaming drivers/media/usb/siano/smsusb.c:183 [inline]
 smsusb_term_device+0xdd/0x3d0 drivers/media/usb/siano/smsusb.c:345
 smsusb_init_device drivers/media/usb/siano/smsusb.c:497 [inline]
 smsusb_probe+0x1aba/0x2280 drivers/media/usb/siano/smsusb.c:575
 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c7/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3776
 usb_set_configuration+0x1bb5/0x2260 drivers/usb/core/message.c:2274
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c7/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3776
 usb_new_device+0x99a/0x1680 drivers/usb/core/hub.c:2713
 hub_port_connect drivers/usb/core/hub.c:5585 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5725 [inline]
 port_event drivers/usb/core/hub.c:5889 [inline]
 hub_event+0x28cf/0x4cf0 drivers/usb/core/hub.c:5971
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 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
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/05 00:42 upstream 6addb4f38557 57bbd979 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in smsusb_term_device
* Struck through repros no longer work on HEAD.