WARNING in usb_stor_scan_dwork/usb_submit_urb

Status: upstream: reported on 2026/08/25 05:13
Subsystems: usb-storage
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+50c258b43e6a020d124f@syzkaller.appspotmail.com
First crash: 7d02h, last: 7d02h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
de052d5f assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in usb_stor_scan_dwork/usb_submit_urb 2026/08/23 00:59 2026/08/23 00:59 2026/08/23 01:25 1e72964b
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[syzbot] [usb-storage?] WARNING in usb_stor_scan_dwork/usb_submit_urb 0 (1) 2026/08/25 05:13

Sample crash report:
------------[ cut here ]------------
URB ffff888103ab5d00 submitted while active
WARNING: drivers/usb/core/urb.c:379 at usb_submit_urb+0x1689/0x19b0 drivers/usb/core/urb.c:379, CPU#0: kworker/0:4/5231
Modules linked in:
CPU: 0 UID: 0 PID: 5231 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_freezable usb_stor_scan_dwork
RIP: 0010:usb_submit_urb+0x168c/0x19b0 drivers/usb/core/urb.c:379
Code: 00 48 8b 04 24 48 8b 90 b0 00 00 00 e9 70 ff ff ff bb ed ff ff ff e9 ac f1 ff ff e8 ce 9a ba fc 48 8d 3d 67 f4 00 06 48 89 de <67> 48 0f b9 3a bb f0 ff ff ff e9 8e f1 ff ff c7 44 24 30 00 00 00
RSP: 0018:ffffc90002dafa48 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888103ab5d00 RCX: dffffc0000000000
RDX: ffff888119261e00 RSI: ffff888103ab5d00 RDI: ffffffff8afa6e20
RBP: 1ffff920005b5f5c R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88813cc60fb0
R13: ffff88813cc60f28 R14: ffffc90002dafb00 R15: ffff888103ab5d00
FS:  0000000000000000(0000) GS:ffff888268633000(0000) knlGS:0000000000000000
Call Trace:
 <TASK>
 usb_stor_scan_dwork+0x1e6/0x2c0 drivers/usb/storage/usb.c:988
 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>
----------------
Code disassembly (best guess):
   0:	00 48 8b             	add    %cl,-0x75(%rax)
   3:	04 24                	add    $0x24,%al
   5:	48 8b 90 b0 00 00 00 	mov    0xb0(%rax),%rdx
   c:	e9 70 ff ff ff       	jmp    0xffffff81
  11:	bb ed ff ff ff       	mov    $0xffffffed,%ebx
  16:	e9 ac f1 ff ff       	jmp    0xfffff1c7
  1b:	e8 ce 9a ba fc       	call   0xfcba9aee
  20:	48 8d 3d 67 f4 00 06 	lea    0x600f467(%rip),%rdi        # 0x600f48e
  27:	48 89 de             	mov    %rbx,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	bb f0 ff ff ff       	mov    $0xfffffff0,%ebx
  34:	e9 8e f1 ff ff       	jmp    0xfffff1c7
  39:	c7                   	.byte 0xc7
  3a:	44 24 30             	rex.R and $0x30,%al
  3d:	00 00                	add    %al,(%rax)

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/21 05:10 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing e1e6e541c5c9 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb WARNING in usb_stor_scan_dwork/usb_submit_urb
* Struck through repros no longer work on HEAD.