Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 2 UID: 0 PID: 9492 Comm: syz.0.1111 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:dummy_udc_stop+0x9b/0x450 drivers/usb/gadget/udc/dummy_hcd.c:1035
Code: c1 ea 03 80 3c 02 00 0f 85 b8 03 00 00 48 8b 9b 90 06 00 00 e8 66 4c 39 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 84 03 00 00 4c 8b 2b 4c 89 ef e8 50 c3 ec 03 49
RSP: 0018:ffffc900077afad0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90007863000
RDX: 0000000000000000 RSI: ffffffff87d1103a RDI: ffff888027a59290
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888058220438
R13: ffff88802d2be540 R14: ffff888027a58c00 R15: ffffffff8cb7caa0
FS:  00007fadc028a6c0(0000) GS:ffff8880d5fde000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3800ec CR3: 00000000364a6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 usb_gadget_udc_stop_locked drivers/usb/gadget/udc/core.c:1265 [inline]
 gadget_unbind_driver+0x2ca/0x4f0 drivers/usb/gadget/udc/core.c:1727
 device_remove+0xcb/0x180 drivers/base/dd.c:616
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
 driver_detach+0xd8/0x1b0 drivers/base/dd.c:1435
 bus_remove_driver+0x13b/0x2e0 drivers/base/bus.c:832
 driver_unregister+0x76/0xb0 drivers/base/driver.c:202
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1784
 unregister_gadget drivers/usb/gadget/configfs.c:263 [inline]
 gadget_dev_desc_UDC_store+0x170/0x2e0 drivers/usb/gadget/configfs.c:290
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fadbf39de99
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:00007fadc028a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fadbf625fa0 RCX: 00007fadbf39de99
RDX: 0000000000000001 RSI: 0000200000000400 RDI: 0000000000000008
RBP: 00007fadbf433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fadbf626038 R14: 00007fadbf625fa0 R15: 00007ffdca8695f8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_udc_stop+0x9b/0x450 drivers/usb/gadget/udc/dummy_hcd.c:1035
Code: c1 ea 03 80 3c 02 00 0f 85 b8 03 00 00 48 8b 9b 90 06 00 00 e8 66 4c 39 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 84 03 00 00 4c 8b 2b 4c 89 ef e8 50 c3 ec 03 49
RSP: 0018:ffffc900077afad0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90007863000
RDX: 0000000000000000 RSI: ffffffff87d1103a RDI: ffff888027a59290
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888058220438
R13: ffff88802d2be540 R14: ffff888027a58c00 R15: ffffffff8cb7caa0
FS:  00007fadc028a6c0(0000) GS:ffff8880d60de000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056058e1c1a78 CR3: 00000000364a6000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	0f 85 b8 03 00 00    	jne    0x3c5
   d:	48 8b 9b 90 06 00 00 	mov    0x690(%rbx),%rbx
  14:	e8 66 4c 39 fa       	call   0xfa394c7f
  19:	48 89 da             	mov    %rbx,%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 84 03 00 00    	jne    0x3b8
  34:	4c 8b 2b             	mov    (%rbx),%r13
  37:	4c 89 ef             	mov    %r13,%rdi
  3a:	e8 50 c3 ec 03       	call   0x3ecc38f
  3f:	49                   	rex.WB