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: 451 Comm: syz.0.60 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:set_link_state+0x2a/0x1230 drivers/usb/gadget/udc/dummy_hcd.c:435
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 4d fb 24 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 e8 85 6a fe 4d 8b 75 00 49 8d 95 9b
RSP: 0018:ffffc9000dfb7560 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8881195f9440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000dfb75e8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001bf6eac R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810e0e0000
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f85b0feb580 CR3: 000000000700f000 CR4: 00000000003506a0
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:914
 usb_gadget_disconnect_locked+0x14c/0x3f0 drivers/usb/gadget/udc/core.c:758
 gadget_unbind_driver+0xab/0x3d0 drivers/usb/gadget/udc/core.c:1679
 device_remove drivers/base/dd.c:548 [inline]
 __device_release_driver drivers/base/dd.c:1283 [inline]
 device_release_driver_internal+0x486/0x7e0 drivers/base/dd.c:1309
 driver_detach+0x1f1/0x2d0 drivers/base/dd.c:1372
 bus_remove_driver+0x121/0x1d0 drivers/base/bus.c:679
 driver_unregister+0x75/0xa0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1745
 raw_release+0xda/0x260 drivers/usb/gadget/legacy/raw_gadget.c:416
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0xaf2/0x2850 kernel/exit.c:887
 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030
 get_signal+0x167c/0x1700 kernel/signal.c:2895
 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4b34b9db2b
Code: Unable to access opcode bytes at 0x7f4b34b9db01.
RSP: 002b:00007f4b359b6f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007f4b34b9db2b
RDX: 00007f4b359b7fd0 RSI: 0000000080085502 RDI: 0000000000000003
RBP: 00007f4b359b7fd0 R08: 0000000000000040 R09: 00007f4b359b6fc8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000000000012 R15: 00007f4b34c526c7
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:set_link_state+0x2a/0x1230 drivers/usb/gadget/udc/dummy_hcd.c:435
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 4d fb 24 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 e8 85 6a fe 4d 8b 75 00 49 8d 95 9b
RSP: 0018:ffffc9000dfb7560 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8881195f9440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000dfb75e8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001bf6eac R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810e0e0000
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f85b0feb580 CR3: 000000000700f000 CR4: 00000000003506a0
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 4d fb 24 fe       	call   0xfe24fb70
  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 e8 85 6a fe       	call   0xfe6a8620
  38:	4d 8b 75 00          	mov    0x0(%r13),%r14
  3c:	49                   	rex.WB
  3d:	8d                   	.byte 0x8d
  3e:	95                   	xchg   %eax,%ebp
  3f:	9b                   	fwait