list_add double add: new=ffff888032693618, prev=ffff888032693618, next=ffff88806181f078.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:37!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 8208 Comm: syz.4.433 Not tainted 6.15.0-rc5-syzkaller-g01f95500a162 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
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 e9 6d ca 51 fc cc 48 c7 c7 e0 d4 c1 8b 4c 89 fe 4c 89 f2 48 89 d9 e8 ac 1a 69 fc 90 <0f> 0b 48 c7 c7 e0 d2 c1 8b e8 9d 1a 69 fc 90 0f 0b 48 c7 c7 80 d3
RSP: 0018:ffffc9000425f310 EFLAGS: 00010046
RAX: 0000000000000058 RBX: ffff88806181f078 RCX: c21650cef648a100
RDX: 0000000000000000 RSI: 0000000080000004 RDI: 0000000000000000
RBP: 1ffff1100c303e10 R08: ffffc9000425efe7 R09: 1ffff9200084bdfc
R10: dffffc0000000000 R11: fffff5200084bdfd R12: 1ffff110064d26c3
R13: dffffc0000000000 R14: ffff888032693618 R15: ffff888032693618
FS:  00007fcf7cc536c0(0000) GS:ffff8881261cb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002000 CR3: 0000000030b58000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:88 [inline]
 __list_add include/linux/list.h:150 [inline]
 list_add_tail include/linux/list.h:183 [inline]
 usb_hcd_link_urb_to_ep+0x1d2/0x330 drivers/usb/core/hcd.c:1158
 dummy_urb_enqueue+0x2a1/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1288
 usb_hcd_submit_urb+0x325/0x1aa0 drivers/usb/core/hcd.c:1533
 cm109_submit_buzz_toggle drivers/input/misc/cm109.c:351 [inline]
 cm109_toggle_buzzer_async+0x114/0x220 drivers/input/misc/cm109.c:484
 cm109_input_ev+0xed/0x190 drivers/input/misc/cm109.c:615
 input_event_dispose+0x80/0x6b0 drivers/input/input.c:321
 input_inject_event+0x1fe/0x320 drivers/input/input.c:423
 kd_sound_helper+0x101/0x210 drivers/tty/vt/keyboard.c:256
 input_handler_for_each_handle+0x101/0x1c0 drivers/input/input.c:2554
 kd_mksound+0x96/0x130 drivers/tty/vt/keyboard.c:280
 handle_ascii drivers/tty/vt/vt.c:2251 [inline]
 do_con_trol drivers/tty/vt/vt.c:2568 [inline]
 do_con_write+0x2a8c/0x48b0 drivers/tty/vt/vt.c:3092
 con_write+0x24/0x40 drivers/tty/vt/vt.c:3432
 process_output_block drivers/tty/n_tty.c:561 [inline]
 n_tty_write+0xd35/0x11d0 drivers/tty/n_tty.c:2377
 iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
 file_tty_write+0x501/0x990 drivers/tty/tty_io.c:1090
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x54b/0xa90 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf7bd85d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcf7cc53038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fcf7bf75fa0 RCX: 00007fcf7bd85d29
RDX: 0000000000001006 RSI: 0000000020001040 RDI: 0000000000000005
RBP: 00007fcf7be01aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcf7bf75fa0 R15: 00007ffcdb5dad28
 </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 e9 6d ca 51 fc cc 48 c7 c7 e0 d4 c1 8b 4c 89 fe 4c 89 f2 48 89 d9 e8 ac 1a 69 fc 90 <0f> 0b 48 c7 c7 e0 d2 c1 8b e8 9d 1a 69 fc 90 0f 0b 48 c7 c7 80 d3
RSP: 0018:ffffc9000425f310 EFLAGS: 00010046
RAX: 0000000000000058 RBX: ffff88806181f078 RCX: c21650cef648a100
RDX: 0000000000000000 RSI: 0000000080000004 RDI: 0000000000000000
RBP: 1ffff1100c303e10 R08: ffffc9000425efe7 R09: 1ffff9200084bdfc
R10: dffffc0000000000 R11: fffff5200084bdfd R12: 1ffff110064d26c3
R13: dffffc0000000000 R14: ffff888032693618 R15: ffff888032693618
FS:  00007fcf7cc536c0(0000) GS:ffff8881261cb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002000 CR3: 0000000030b58000 CR4: 0000000000350ef0