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: 2397 Comm: syz.5.785 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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 4d fc 57 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 c8 71 92 fe 4d 8b 75 00 49 8d 95 8b
RSP: 0018:ffffc90000c37a48 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900097cd000 RSI: 0000000000000034 RDI: 0000000000000035
RBP: ffffc90000c37ad0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000186f48 R12: 0000000000000a06
R13: 0000000000000000 R14: ffff88810b81c000 R15: 0000000000000000
FS:  00007f5be74d76c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000136c3e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dummy_pullup+0xd9/0x220 drivers/usb/gadget/udc/dummy_hcd.c:909
 usb_gadget_disconnect_locked+0x133/0x3b0 drivers/usb/gadget/udc/core.c:744
 usb_gadget_remove_driver+0x55/0x330 drivers/usb/gadget/udc/core.c:1492
 usb_gadget_unregister_driver+0x181/0x480 drivers/usb/gadget/udc/core.c:1656
 unregister_gadget drivers/usb/gadget/configfs.c:284 [inline]
 gadget_dev_desc_UDC_store+0x1c2/0x330 drivers/usb/gadget/configfs.c:311
 flush_write_buffer fs/configfs/file.c:251 [inline]
 configfs_write_file+0x320/0x3d0 fs/configfs/file.c:283
 vfs_write+0x344/0xd70 fs/read_write.c:603
 ksys_write+0x14a/0x260 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:667
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f5be8a7e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5be74d7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5be8d05fa0 RCX: 00007f5be8a7e0d9
RDX: 0000000000000001 RSI: 00002000000004c0 RDI: 0000000000000005
RBP: 00007f5be8b15024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5be8d06038 R14: 00007f5be8d05fa0 R15: 00007ffebcb52bb8
Modules linked in:
---[ end trace 7283f71c22063a48 ]---
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 4d fc 57 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 c8 71 92 fe 4d 8b 75 00 49 8d 95 8b
RSP: 0018:ffffc90000c37a48 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900097cd000 RSI: 0000000000000034 RDI: 0000000000000035
RBP: ffffc90000c37ad0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000186f48 R12: 0000000000000a06
R13: 0000000000000000 R14: ffff88810b81c000 R15: 0000000000000000
FS:  00007f5be74d76c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000136c3e000 CR4: 00000000003506b0
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 fc 57 fe       	call   0xfe57fc70
  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 c8 71 92 fe       	call   0xfe927200
  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