general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 4005 Comm: syz.0.1117 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:dummy_udc_stop+0x7e/0x330 drivers/usb/gadget/udc/dummy_hcd.c:1031
Code: 4d 8d bc c7 d0 04 00 00 4c 89 f8 48 c1 e8 03 80 3c 18 00 49 89 de 74 08 4c 89 ff e8 9c 7c 7f fe 49 8b 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 83 7c 7f fe 48 8b 1b 48 89 df e8
RSP: 0018:ffffc90000b37800 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888111c4bb40
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000005
RBP: ffffc90000b37858 R08: ffff8881123ca003 R09: 1ffff11022479400
R10: dffffc0000000000 R11: ffffed1022479401 R12: ffff8881019b4c90
R13: ffffffff857c2748 R14: dffffc0000000000 R15: ffff8881019b5160
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000269030 CR3: 00000001171f9000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 usb_gadget_udc_stop drivers/usb/gadget/udc/core.c:1147 [inline]
 usb_gadget_remove_driver+0x1ee/0x310 drivers/usb/gadget/udc/core.c:1441
 usb_gadget_unregister_driver+0x181/0x480 drivers/usb/gadget/udc/core.c:1606
 raw_release+0xda/0x260 drivers/usb/gadget/legacy/raw_gadget.c:416
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xb70/0x29a0 kernel/exit.c:890
 do_group_exit+0x149/0x310 kernel/exit.c:1004
 get_signal+0x64f/0x1430 kernel/signal.c:2908
 arch_do_signal_or_restart+0xe2/0x1100 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f12f69c5d6b
Code: Unable to access opcode bytes at RIP 0x7f12f69c5d41.
RSP: 002b:00007f12f541cf00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000007 RCX: 00007f12f69c5d6b
RDX: 00007f12f541dfd0 RSI: 0000000080085502 RDI: 0000000000000007
RBP: 00007f12f541dfd0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000000000002 R15: 00007f12f6a7b882
 </TASK>
Modules linked in:
---[ end trace 99a9dd33dae428f9 ]---
RIP: 0010:dummy_udc_stop+0x7e/0x330 drivers/usb/gadget/udc/dummy_hcd.c:1031
Code: 4d 8d bc c7 d0 04 00 00 4c 89 f8 48 c1 e8 03 80 3c 18 00 49 89 de 74 08 4c 89 ff e8 9c 7c 7f fe 49 8b 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 83 7c 7f fe 48 8b 1b 48 89 df e8
RSP: 0018:ffffc90000b37800 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888111c4bb40
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000005
RBP: ffffc90000b37858 R08: ffff8881123ca003 R09: 1ffff11022479400
R10: dffffc0000000000 R11: ffffed1022479401 R12: ffff8881019b4c90
R13: ffffffff857c2748 R14: dffffc0000000000 R15: ffff8881019b5160
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000269030 CR3: 000000014a048000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4d 8d bc c7 d0 04 00 	lea    0x4d0(%r15,%rax,8),%r15
   7:	00
   8:	4c 89 f8             	mov    %r15,%rax
   b:	48 c1 e8 03          	shr    $0x3,%rax
   f:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  13:	49 89 de             	mov    %rbx,%r14
  16:	74 08                	je     0x20
  18:	4c 89 ff             	mov    %r15,%rdi
  1b:	e8 9c 7c 7f fe       	call   0xfe7f7cbc
  20:	49 8b 1f             	mov    (%r15),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 83 7c 7f fe       	call   0xfe7f7cbc
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 89 df             	mov    %rbx,%rdi
  3f:	e8                   	.byte 0xe8