Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 831 Comm: syz.0.199 Not tainted syzkaller #0 a4a563d0c71b2f3eba821a1af94cbf4bdc8174ca
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_udc_stop+0x82/0x330 drivers/usb/gadget/udc/dummy_hcd.c:1034
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 e8 c9 26 fe 49 8b 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 cf c9 26 fe 48 8b 1b 48 89 df e8
RSP: 0018:ffffc9000f06f7c0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88810bbd3900 RSI: 0000000000000002 RDI: 0000000000000005
RBP: ffffc9000f06f818 R08: ffffc9000f06f7a7 R09: 1ffff92001e0def4
R10: 0000000000000000 R11: ffffffff83b96760 R12: ffff888104b64c90
R13: 1ffff11020df7001 R14: dffffc0000000000 R15: ffff888104b65160
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000001c0 CR3: 00000001047da000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 usb_gadget_udc_stop_locked drivers/usb/gadget/udc/core.c:1253 [inline]
 gadget_unbind_driver+0x298/0x3f0 drivers/usb/gadget/udc/core.c:1679
 device_remove drivers/base/dd.c:567 [inline]
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x4ad/0x830 drivers/base/dd.c:1295
 driver_detach+0x1f5/0x2d0 drivers/base/dd.c:1358
 bus_remove_driver+0x254/0x2b0 drivers/base/bus.c:744
 driver_unregister+0x79/0xb0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x52/0x80 drivers/usb/gadget/udc/core.c:1736
 raw_release+0xdb/0x280 drivers/usb/gadget/legacy/raw_gadget.c:463
 __fput+0x20b/0xa30 fs/file_table.c:447
 ____fput+0x20/0x30 fs/file_table.c:475
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 do_group_exit+0x21f/0x2f0 kernel/exit.c:1098
 get_signal+0x134c/0x1490 kernel/signal.c:2933
 arch_do_signal_or_restart+0xbc/0x700 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x57/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb75379db2b
Code: Unable to access opcode bytes at 0x7fb75379db01.
RSP: 002b:00007fb754744f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007fb75379db2b
RDX: 00007fb754745fd0 RSI: 0000000080085502 RDI: 0000000000000003
RBP: 00007fb754745fd0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000000000002 R15: 00007fb7538526c7
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_udc_stop+0x82/0x330 drivers/usb/gadget/udc/dummy_hcd.c:1034
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 e8 c9 26 fe 49 8b 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 cf c9 26 fe 48 8b 1b 48 89 df e8
RSP: 0018:ffffc9000f06f7c0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88810bbd3900 RSI: 0000000000000002 RDI: 0000000000000005
RBP: ffffc9000f06f818 R08: ffffc9000f06f7a7 R09: 1ffff92001e0def4
R10: 0000000000000000 R11: ffffffff83b96760 R12: ffff888104b64c90
R13: 1ffff11020df7001 R14: dffffc0000000000 R15: ffff888104b65160
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc9bf758060 CR3: 00000001047da000 CR4: 00000000003526b0
----------------
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 e8 c9 26 fe       	call   0xfe26ca08
  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 cf c9 26 fe       	call   0xfe26ca08
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 89 df             	mov    %rbx,%rdi
  3f:	e8                   	.byte 0xe8