list_add double add: new=ffff88803040d518, prev=ffff88803040d518, next=ffff888075be8078.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:37!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 8317 Comm: syz.3.754 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__list_add_valid_or_report+0x9c/0x120 lib/list_debug.c:35
Code: df 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 ca 72 89 06 cc 48 c7 c7 20 2f 7f 8b 4c 89 fe 4c 89 f2 48 89 d9 e8 64 8e 9c fc <0f> 0b 48 c7 c7 20 2d 7f 8b e8 56 8e 9c fc 0f 0b 48 c7 c7 c0 2d 7f
RSP: 0018:ffffc9000af9f310 EFLAGS: 00010046
RAX: 0000000000000058 RBX: ffff888075be8078 RCX: 42b9fe1fe7e63500
RDX: 0000000000000000 RSI: 0000000080000004 RDI: 0000000000000000
RBP: 1ffff1100eb7d010 R08: ffffc9000af9f027 R09: 1ffff920015f3e04
R10: dffffc0000000000 R11: fffff520015f3e05 R12: 1ffff11006081aa3
R13: dffffc0000000000 R14: ffff88803040d518 R15: ffff88803040d518
FS:  00007fe3f440b6c0(0000) GS:ffff888126788000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd83df7d78 CR3: 0000000027d2c000 CR4: 00000000003526f0
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+0x1ce/0x330 drivers/usb/core/hcd.c:1158
 dummy_urb_enqueue+0x29d/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1288
 usb_hcd_submit_urb+0x326/0x1a70 drivers/usb/core/hcd.c:1546
 cm109_submit_buzz_toggle drivers/input/misc/cm109.c:351 [inline]
 cm109_toggle_buzzer_async+0x114/0x260 drivers/input/misc/cm109.c:484
 cm109_input_ev+0xe9/0x180 drivers/input/misc/cm109.c:615
 input_event_dispose+0x7d/0x6b0 drivers/input/input.c:321
 input_inject_event+0x1d9/0x330 drivers/input/input.c:423
 kd_sound_helper+0xfd/0x210 drivers/tty/vt/keyboard.c:256
 input_handler_for_each_handle+0xfd/0x1c0 drivers/input/input.c:2554
 kd_mksound+0x92/0x130 drivers/tty/vt/keyboard.c:280
 handle_ascii drivers/tty/vt/vt.c:2272 [inline]
 do_con_trol drivers/tty/vt/vt.c:2589 [inline]
 do_con_write+0x3239/0x5200 drivers/tty/vt/vt.c:3174
 con_write+0x20/0x40 drivers/tty/vt/vt.c:3516
 process_output_block drivers/tty/n_tty.c:561 [inline]
 n_tty_write+0xd23/0x1200 drivers/tty/n_tty.c:2377
 iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
 file_tty_write+0x55e/0xa20 drivers/tty/tty_io.c:1081
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x588/0xb10 fs/read_write.c:686
 ksys_write+0x141/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x86/0x2e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe3f358eec9
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:00007fe3f440b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe3f37e5fa0 RCX: 00007fe3f358eec9
RDX: 000000000000045c RSI: 00002000000004c0 RDI: 0000000000000005
RBP: 00007fe3f3611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe3f37e6038 R14: 00007fe3f37e5fa0 R15: 00007fffcd12b248
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0x9c/0x120 lib/list_debug.c:35
Code: df 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 ca 72 89 06 cc 48 c7 c7 20 2f 7f 8b 4c 89 fe 4c 89 f2 48 89 d9 e8 64 8e 9c fc <0f> 0b 48 c7 c7 20 2d 7f 8b e8 56 8e 9c fc 0f 0b 48 c7 c7 c0 2d 7f
RSP: 0018:ffffc9000af9f310 EFLAGS: 00010046
RAX: 0000000000000058 RBX: ffff888075be8078 RCX: 42b9fe1fe7e63500
RDX: 0000000000000000 RSI: 0000000080000004 RDI: 0000000000000000
RBP: 1ffff1100eb7d010 R08: ffffc9000af9f027 R09: 1ffff920015f3e04
R10: dffffc0000000000 R11: fffff520015f3e05 R12: 1ffff11006081aa3
R13: dffffc0000000000 R14: ffff88803040d518 R15: ffff88803040d518
FS:  00007fe3f440b6c0(0000) GS:ffff888126788000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd83df7d78 CR3: 0000000027d2c000 CR4: 00000000003526f0