WARNING in ec168_ctrl_msg/usb_submit_urb

Status: upstream: reported C repro on 2026/10/18 16:18
Subsystems: usb
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+ed3ada41c4eb1c4ab78e@syzkaller.appspotmail.com
First crash: 4d02h, last: 4d01h
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ID Workflow Result Correct Bug Created Started Finished Revision
2fa01167 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in ec168_ctrl_msg/usb_submit_urb 2026/10/15 00:45 2026/10/15 00:45 2026/10/15 01:24 8fb0ae89
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Title Replies (including bot) Last reply
[syzbot] [usb?] WARNING in ec168_ctrl_msg/usb_submit_urb 1 (2) 2026/10/18 16:30

Sample crash report:
------------[ cut here ]------------
usb 5-1: BOGUS control dir, pipe 80000280 doesn't match bRequestType c0
WARNING: drivers/usb/core/urb.c:413 at usb_submit_urb+0x1057/0x18b0 drivers/usb/core/urb.c:411, CPU#0: syz.0.17/5521
Modules linked in:
CPU: 0 UID: 0 PID: 5521 Comm: syz.0.17 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
RIP: 0010:usb_submit_urb+0x1100/0x18b0 drivers/usb/core/urb.c:411
Code: b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 0f 85 b2 05 00 00 45 0f b6 45 00 48 8b 3c 24 48 8b 74 24 18 4c 89 f2 44 89 f9 <67> 48 0f b9 3a 48 bd 00 00 00 00 00 fc ff df e9 ba f2 ff ff 44 89
RSP: 0000:ffffc9000228f8d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888044085800 RCX: 0000000080000280
RDX: ffff88801317fa20 RSI: ffffffff8cc57b40 RDI: ffffffff91885110
RBP: dffffc0000000000 R08: 00000000000000c0 R09: 0000000000000000
R10: ffffc9000228f9c0 R11: fffff52000451f44 R12: 1ffff11003c397d4
R13: ffff88801e1cbea0 R14: ffff88801317fa20 R15: 0000000080000280
FS:  0000555560660500(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c3f68e000 CR3: 00000000440b1000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62
 usb_internal_control_msg drivers/usb/core/message.c:117 [inline]
 usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167
 ec168_ctrl_msg+0x308/0x7c0 drivers/media/usb/dvb-usb-v2/ec168.c:73
 ec168_i2c_xfer+0x10e/0x630 drivers/media/usb/dvb-usb-v2/ec168.c:127
 __i2c_transfer+0x7bf/0x1fe0 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x1cb/0x2d0 drivers/i2c/i2c-core-base.c:2350
 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306
 i2cdev_ioctl+0x6a5/0x880 drivers/i2c/i2c-dev.c:467
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa9f059e559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd4b173ed8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa9f0825fa0 RCX: 00007fa9f059e559
RDX: 0000200000000200 RSI: 0000000000000707 RDI: 0000000000000004
RBP: 00007fa9f06358b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa9f0825fac R14: 00007fa9f0825fa0 R15: 00007fa9f0825fa0
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	lcall  (bad)
   8:	df 41 0f             	filds  0xf(%rcx)
   b:	b6 04                	mov    $0x4,%dh
   d:	04 84                	add    $0x84,%al
   f:	c0 0f 85             	rorb   $0x85,(%rdi)
  12:	b2 05                	mov    $0x5,%dl
  14:	00 00                	add    %al,(%rax)
  16:	45 0f b6 45 00       	movzbl 0x0(%r13),%r8d
  1b:	48 8b 3c 24          	mov    (%rsp),%rdi
  1f:	48 8b 74 24 18       	mov    0x18(%rsp),%rsi
  24:	4c 89 f2             	mov    %r14,%rdx
  27:	44 89 f9             	mov    %r15d,%ecx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbp
  36:	fc ff df
  39:	e9 ba f2 ff ff       	jmp    0xfffff2f8
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/14 16:50 upstream 4056b3c9d3c9 1a71827b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ec168_ctrl_msg/usb_submit_urb
2026/10/14 16:07 upstream 4056b3c9d3c9 1a71827b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ec168_ctrl_msg/usb_submit_urb
2026/10/14 16:06 upstream 4056b3c9d3c9 1a71827b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ec168_ctrl_msg/usb_submit_urb
* Struck through repros no longer work on HEAD.