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: 511 Comm: syz.0.51 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:set_link_state+0x2a/0x1210 drivers/usb/gadget/udc/dummy_hcd.c:432
Code: 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 60 49 89 fd 48 bb 00 00 00 00 00 fc ff df e8 9d 08 40 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 f8 77 7f fe 4d 8b 75 00 49 8d 95 8b
RSP: 0018:ffffc90000bef760 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88811963cf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000bef7e8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200017deec R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810b744000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdea8231000 CR3: 000000000660f000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dummy_pullup+0xcd/0x130 drivers/usb/gadget/udc/dummy_hcd.c:911
 usb_gadget_disconnect+0xe0/0x330 drivers/usb/gadget/udc/core.c:736
 usb_gadget_remove_driver+0x46/0x310 drivers/usb/gadget/udc/core.c:1436
 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: 0033:0x7f29a61e0b2b
Code: Unable to access opcode bytes at RIP 0x7f29a61e0b01.
RSP: 002b:00007f29a4c37f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000006 RCX: 00007f29a61e0b2b
RDX: 00007f29a4c38fd0 RSI: 0000000080085502 RDI: 0000000000000006
RBP: 00007f29a4c38fd0 R08: 00007f29a60a8ba7 R09: 00007f29a4c37fc8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000000000004 R15: 00007f29a62956c7
 </TASK>
Modules linked in:
---[ end trace ccee8bd811c45bd7 ]---
RIP: 0010:set_link_state+0x2a/0x1210 drivers/usb/gadget/udc/dummy_hcd.c:432
Code: 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 60 49 89 fd 48 bb 00 00 00 00 00 fc ff df e8 9d 08 40 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 f8 77 7f fe 4d 8b 75 00 49 8d 95 8b
RSP: 0018:ffffc90000bef760 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88811963cf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000bef7e8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200017deec R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810b744000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdea8231000 CR3: 000000000660f000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	55                   	push   %rbp
   1:	48 89 e5             	mov    %rsp,%rbp
   4:	41 57                	push   %r15
   6:	41 56                	push   %r14
   8:	41 55                	push   %r13
   a:	41 54                	push   %r12
   c:	53                   	push   %rbx
   d:	48 83 ec 60          	sub    $0x60,%rsp
  11:	49 89 fd             	mov    %rdi,%r13
  14:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
  1b:	fc ff df
  1e:	e8 9d 08 40 fe       	call   0xfe4008c0
  23:	4c 89 e8             	mov    %r13,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ef             	mov    %r13,%rdi
  33:	e8 f8 77 7f fe       	call   0xfe7f7830
  38:	4d 8b 75 00          	mov    0x0(%r13),%r14
  3c:	49                   	rex.WB
  3d:	8d                   	.byte 0x8d
  3e:	95                   	xchg   %eax,%ebp
  3f:	8b                   	.byte 0x8b