dummy_hcd dummy_hcd.0: stopped
dummy_hcd dummy_hcd.0: USB bus 5 deregistered
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: 5925 Comm: syz.0.17 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:set_link_state+0x27/0xc70 drivers/usb/gadget/udc/dummy_hcd.c:455
Code: 90 90 90 41 57 41 56 41 55 41 54 55 53 48 89 fb 48 83 ec 18 e8 aa 68 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 35 0b 00 00 4c 8d ab a3 00 00 00 48 8b 2b 48 b8
RSP: 0018:ffffc90003817850 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87d10673
RDX: 0000000000000000 RSI: ffffffff87d0f796 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000293
R13: ffff88802a8f8000 R14: 0000000000000000 R15: ffff88802a8f8c00
FS:  0000000000000000(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558841d02488 CR3: 000000000e994000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dummy_pullup+0xf3/0x170 drivers/usb/gadget/udc/dummy_hcd.c:933
 usb_gadget_disconnect_locked+0x142/0x4e0 drivers/usb/gadget/udc/core.c:785
 gadget_unbind_driver+0xd8/0x4f0 drivers/usb/gadget/udc/core.c:1718
 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
 raw_release+0x19b/0x260 drivers/usb/gadget/legacy/raw_gadget.c:463
 __fput+0x3ff/0xb50 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x951/0x2ae0 kernel/exit.c:1009
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1152
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3046
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8c5419de99
Code: Unable to access opcode bytes at 0x7f8c5419de6f.
RSP: 002b:00007ffc3d839718 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: 000000000000000b RBX: 00007f8c54425fa0 RCX: 00007f8c5419de99
RDX: 000000000000000b RSI: 0000200000000200 RDI: 0000000000000004
RBP: 00007f8c54233eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8c54425fac R14: 00007f8c54425fa0 R15: 00007f8c54425fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:set_link_state+0x27/0xc70 drivers/usb/gadget/udc/dummy_hcd.c:455
Code: 90 90 90 41 57 41 56 41 55 41 54 55 53 48 89 fb 48 83 ec 18 e8 aa 68 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 35 0b 00 00 4c 8d ab a3 00 00 00 48 8b 2b 48 b8
RSP: 0018:ffffc90003817850 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87d10673
RDX: 0000000000000000 RSI: ffffffff87d0f796 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000293
R13: ffff88802a8f8000 R14: 0000000000000000 R15: ffff88802a8f8c00
FS:  0000000000000000(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558841d02488 CR3: 000000000e994000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	41 57                	push   %r15
   5:	41 56                	push   %r14
   7:	41 55                	push   %r13
   9:	41 54                	push   %r12
   b:	55                   	push   %rbp
   c:	53                   	push   %rbx
   d:	48 89 fb             	mov    %rdi,%rbx
  10:	48 83 ec 18          	sub    $0x18,%rsp
  14:	e8 aa 68 39 fa       	call   0xfa3968c3
  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 35 0b 00 00    	jne    0xb69
  34:	4c 8d ab a3 00 00 00 	lea    0xa3(%rbx),%r13
  3b:	48 8b 2b             	mov    (%rbx),%rbp
  3e:	48                   	rex.W
  3f:	b8                   	.byte 0xb8