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: 5170 Comm: syz.0.266 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:set_link_state+0x27/0x11d0 drivers/usb/gadget/udc/dummy_hcd.c:432
Code: ff ff 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 50 49 89 fe 48 bb 00 00 00 00 00 fc ff df e8 60 88 42 fb 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 0b ab 87 fb 4d 8b 26 4c 89 74 24 10
RSP: 0018:ffffc90003f97808 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88807e473b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520007f2ef0 R12: 0000000000000a06
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000980 CR3: 0000000064e53000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 dummy_pullup+0xbd/0x120 drivers/usb/gadget/udc/dummy_hcd.c:911
 usb_gadget_disconnect+0xd0/0x3a0 drivers/usb/gadget/udc/core.c:763
 usb_gadget_remove_driver+0x4a/0x350 drivers/usb/gadget/udc/core.c:1491
 usb_gadget_unregister_driver+0x15d/0x4c0 drivers/usb/gadget/udc/core.c:1654
 raw_release+0xd6/0x260 drivers/usb/gadget/legacy/raw_gadget.c:416
 __fput+0x212/0x8c0 fs/file_table.c:311
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x635/0x2110 kernel/exit.c:890
 do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
 get_signal+0x7eb/0x12e0 kernel/signal.c:2909
 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:280
RIP: 0033:0x7f6a6ce0cec9
Code: Unable to access opcode bytes at RIP 0x7f6a6ce0ce9f.
RSP: 002b:00007f6a6b0431c0 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3
RAX: 0000000000000000 RBX: 00007f6a6cdc8460 RCX: 00007f6a6ce0cec9
RDX: 00007f6a6cdc8460 RSI: 0000000000000058 RDI: 00007fff92143bf0
RBP: 00007f6a6b0436c0 R08: 00007f6a6b0436c0 R09: 00007fff92143cd7
R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffe8
R13: 000000000000006e R14: 00007fff92143bf0 R15: 00007fff92143cd8
 </TASK>
Modules linked in:
---[ end trace 9aac458cc14414ac ]---
RIP: 0010:set_link_state+0x27/0x11d0 drivers/usb/gadget/udc/dummy_hcd.c:432
Code: ff ff 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 50 49 89 fe 48 bb 00 00 00 00 00 fc ff df e8 60 88 42 fb 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 0b ab 87 fb 4d 8b 26 4c 89 74 24 10
RSP: 0018:ffffc90003f97808 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88807e473b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520007f2ef0 R12: 0000000000000a06
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000980 CR3: 0000000064e53000 CR4: 00000000003506f0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	ff 90 55 41 57 41    	call   *0x41574155(%rax)
   6:	56                   	push   %rsi
   7:	41 55                	push   %r13
   9:	41 54                	push   %r12
   b:	53                   	push   %rbx
   c:	48 83 ec 50          	sub    $0x50,%rsp
  10:	49 89 fe             	mov    %rdi,%r14
  13:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
  1a:	fc ff df
  1d:	e8 60 88 42 fb       	call   0xfb428882
  22:	4c 89 f0             	mov    %r14,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2d:	74 08                	je     0x37
  2f:	4c 89 f7             	mov    %r14,%rdi
  32:	e8 0b ab 87 fb       	call   0xfb87ab42
  37:	4d 8b 26             	mov    (%r14),%r12
  3a:	4c 89 74 24 10       	mov    %r14,0x10(%rsp)