list_add double add: new=ffff888022ec2918, prev=ffff888022ec2918, next=ffff88805b180078.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:35!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 9373 Comm: syz.1.1285 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:__list_add_valid_or_report.cold+0x34/0x36 lib/list_debug.c:35
Code: ec ff 90 0f 0b 48 c7 c7 20 35 fa 8b e8 e9 5f ec ff 90 0f 0b 48 89 d9 4c 89 ea 48 89 ee 48 c7 c7 60 37 fa 8b e8 d1 5f ec ff 90 <0f> 0b 48 89 de 48 c7 c7 20 38 fa 8b e8 bf 5f ec ff 90 0f 0b 48 89
RSP: 0018:ffffc9000d92f798 EFLAGS: 00010082
RAX: 0000000000000058 RBX: ffff88805b180078 RCX: 0000000000000000
RDX: 0000000000000058 RSI: ffffffff81e5dd09 RDI: fffff52001b25ee4
RBP: ffff888022ec2918 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000004 R11: 00000000000cf600 R12: ffff88805b180080
R13: ffff888022ec2918 R14: 0000000000000000 R15: ffff888022ec2918
FS:  00007f000a6cf6c0(0000) GS:ffff8881245dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa7b31e67c0 CR3: 0000000079a45000 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+0x220/0x3a0 drivers/usb/core/hcd.c:1158
 dummy_urb_enqueue+0x2b5/0x880 drivers/usb/gadget/udc/dummy_hcd.c:1288
 usb_hcd_submit_urb+0x26c/0x2150 drivers/usb/core/hcd.c:1546
 usb_submit_urb+0x8aa/0x1910 drivers/usb/core/urb.c:587
 cm109_submit_buzz_toggle+0xd1/0x130 drivers/input/misc/cm109.c:351
 cm109_toggle_buzzer_async drivers/input/misc/cm109.c:484 [inline]
 cm109_input_ev+0x233/0x280 drivers/input/misc/cm109.c:615
 input_event_dispose drivers/input/input.c:322 [inline]
 input_handle_event+0x151/0x1500 drivers/input/input.c:370
 input_inject_event+0x1f1/0x3b0 drivers/input/input.c:424
 kd_sound_helper+0x17a/0x280 drivers/tty/vt/keyboard.c:256
 input_handler_for_each_handle+0xd7/0x250 drivers/input/input.c:2520
 kd_mksound+0x88/0x130 drivers/tty/vt/keyboard.c:280
 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:303 [inline]
 vt_ioctl+0xace/0x31a0 drivers/tty/vt/vt_ioctl.c:743
 tty_ioctl+0x26a/0x1690 drivers/tty/tty_io.c:2792
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0009799079
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:00007f000a6cf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f00099c5fa0 RCX: 00007f0009799079
RDX: 0000000000000000 RSI: 0000000000004b2f RDI: 0000000000000005
RBP: 00007f000982ba4c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f00099c5fa0 R15: 00007ffe6879ac08
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report.cold+0x34/0x36 lib/list_debug.c:35
Code: ec ff 90 0f 0b 48 c7 c7 20 35 fa 8b e8 e9 5f ec ff 90 0f 0b 48 89 d9 4c 89 ea 48 89 ee 48 c7 c7 60 37 fa 8b e8 d1 5f ec ff 90 <0f> 0b 48 89 de 48 c7 c7 20 38 fa 8b e8 bf 5f ec ff 90 0f 0b 48 89
RSP: 0018:ffffc9000d92f798 EFLAGS: 00010082
RAX: 0000000000000058 RBX: ffff88805b180078 RCX: 0000000000000000
RDX: 0000000000000058 RSI: ffffffff81e5dd09 RDI: fffff52001b25ee4
RBP: ffff888022ec2918 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000004 R11: 00000000000cf600 R12: ffff88805b180080
R13: ffff888022ec2918 R14: 0000000000000000 R15: ffff888022ec2918
FS:  00007f000a6cf6c0(0000) GS:ffff8881245dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa7b31e67c0 CR3: 0000000079a45000 CR4: 00000000003526f0