input: CM109 USB driver as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.8/input/input16
list_add double add: new=ffff888034e74718, prev=ffff888034e74718, next=ffff8880562be078.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:37!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 5697 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:__list_add_valid_or_report+0xa5/0x130 lib/list_debug.c:35
Code: 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 c7 c7 c0 b1 28 8c 4c 89 fe 4c 89 f2 48 89 d9 e8 ec 18 6b fc 90 <0f> 0b 48 c7 c7 a0 af 28 8c e8 dd 18 6b fc 90 0f 0b 48 c7 c7 60 b0
RSP: 0018:ffffc900040eea58 EFLAGS: 00010046
RAX: 0000000000000058 RBX: ffff8880562be078 RCX: c262e3790bf44500
RDX: ffffc9001ce01000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: 1ffff1100ac57c10 R08: ffffffff8e94f0e3 R09: 1ffffffff1d29e1c
R10: dffffc0000000000 R11: fffffbfff1d29e1d R12: 1ffff110069ce8e3
R13: dffffc0000000000 R14: ffff888034e74718 R15: ffff888034e74718
FS:  0000000000000000(0000) GS:ffff88812538d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca0167c40 CR3: 000000007f094000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add_tail include/linux/list.h:191 [inline]
 usb_hcd_link_urb_to_ep+0x1d2/0x330 drivers/usb/core/hcd.c:1154
 dummy_urb_enqueue+0x2a1/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1292
 usb_hcd_submit_urb+0x328/0x1b70 drivers/usb/core/hcd.c:1542
 cm109_input_open+0x1fb/0x480 drivers/input/misc/cm109.c:566
 input_open_device+0x1f8/0x3b0 drivers/input/input.c:601
 kbd_connect+0xf6/0x150 drivers/tty/vt/keyboard.c:1631
 input_attach_handler drivers/input/input.c:1011 [inline]
 input_register_device+0xce0/0x1140 drivers/input/input.c:2395
 cm109_usb_probe+0x1190/0x1690 drivers/input/misc/cm109.c:797
 usb_probe_interface+0x659/0xc70 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x267/0xaf0 drivers/base/dd.c:709
 __driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
 __device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c5/0x450 drivers/base/dd.c:1101
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:613
 device_add+0x7e9/0xbb0 drivers/base/core.c:3706
 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x267/0xaf0 drivers/base/dd.c:709
 __driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
 __device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c5/0x450 drivers/base/dd.c:1101
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:613
 device_add+0x7e9/0xbb0 drivers/base/core.c:3706
 usb_new_device+0xa08/0x16f0 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+0x2a1c/0x4f30 drivers/usb/core/hub.c:5953
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 kthread+0x388/0x470 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>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xa5/0x130 lib/list_debug.c:35
Code: 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 c7 c7 c0 b1 28 8c 4c 89 fe 4c 89 f2 48 89 d9 e8 ec 18 6b fc 90 <0f> 0b 48 c7 c7 a0 af 28 8c e8 dd 18 6b fc 90 0f 0b 48 c7 c7 60 b0
RSP: 0018:ffffc900040eea58 EFLAGS: 00010046
RAX: 0000000000000058 RBX: ffff8880562be078 RCX: c262e3790bf44500
RDX: ffffc9001ce01000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: 1ffff1100ac57c10 R08: ffffffff8e94f0e3 R09: 1ffffffff1d29e1c
R10: dffffc0000000000 R11: fffffbfff1d29e1d R12: 1ffff110069ce8e3
R13: dffffc0000000000 R14: ffff888034e74718 R15: ffff888034e74718
FS:  0000000000000000(0000) GS:ffff88812538d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca0167c40 CR3: 000000007f094000 CR4: 00000000003526f0