general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 2080 Comm: syz.0.532 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 0c 7d 7f fe 49 8b 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 f3 7c 7f fe 48 8b 1b 48 89 df e8
RSP: 0018:ffffc90000c47800 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811aa393c0
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000c47858 R08: ffff888144040003 R09: 1ffff11028808000
R10: dffffc0000000000 R11: ffffed1028808001 R12: ffff8881045d4c90
R13: ffffffff857c2608 R14: dffffc0000000000 R15: ffff8881045d5160
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000011a80d000 CR4: 00000000003526a0
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: 0033:0x7f7b36f98019
Code: Unable to access opcode bytes at RIP 0x7f7b36f97fef.
RSP: 002b:00007fffdc78a548 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffdfc RBX: 000000000001b5aa RCX: 00007f7b36f98019
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7b3721ffac
RBP: 0000000000000bea R08: 000145bad17f1ff3 R09: 0000000000000000
R10: 00007fffdc78a650 R11: 0000000000000246 R12: 00007fffdc78a670
R13: 00007f7b3721ffac R14: 000000000001c194 R15: 00007fffdc78a650
 </TASK>
Modules linked in:
---[ end trace e702e71fd689363a ]---
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 0c 7d 7f fe 49 8b 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 f3 7c 7f fe 48 8b 1b 48 89 df e8
RSP: 0018:ffffc90000c47800 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811aa393c0
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000c47858 R08: ffff888144040003 R09: 1ffff11028808000
R10: dffffc0000000000 R11: ffffed1028808001 R12: ffff8881045d4c90
R13: ffffffff857c2608 R14: dffffc0000000000 R15: ffff8881045d5160
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010d6a7000 CR4: 00000000003526a0
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 0c 7d 7f fe       	call   0xfe7f7d2c
  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 f3 7c 7f fe       	call   0xfe7f7d2c
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 89 df             	mov    %rbx,%rdi
  3f:	e8                   	.byte 0xe8