gadgetfs: bound to dummy_udc driver
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 3 UID: 0 PID: 11351 Comm: syz.4.2123 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0x8f/0x180 drivers/usb/gadget/udc/dummy_hcd.c:1053
Code: c1 ea 03 80 3c 02 00 0f 85 f9 00 00 00 48 8b 9b 90 06 00 00 e8 72 31 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 c5 00 00 00 48 8b 1b 48 89 df e8 5c d6 ec 03 48
RSP: 0018:ffffc9000c06fc20 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900040f9000
RDX: 0000000000000000 RSI: ffffffff87d12ece RDI: ffff88802a045290
RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000002 R11: 0000000000000000 R12: ffffffff90256060
R13: ffff88802d047540 R14: ffff88802a044c00 R15: ffffffff8cb7ccc0
FS:  00007f022162a6c0(0000) GS:ffff8880d60dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31911ff8 CR3: 0000000037d0d000 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
 dev_release+0x132/0x1b0 drivers/usb/gadget/legacy/inode.c:1198
 __fput+0x3ff/0xb50 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 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: 0033:0x7f022079de99
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:00007f022162a028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f0220a25fa0 RCX: 00007f022079de99
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: 00007f0220833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0220a26038 R14: 00007f0220a25fa0 R15: 00007ffeeb2aad18
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_udc_stop+0x8f/0x180 drivers/usb/gadget/udc/dummy_hcd.c:1053
Code: c1 ea 03 80 3c 02 00 0f 85 f9 00 00 00 48 8b 9b 90 06 00 00 e8 72 31 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 c5 00 00 00 48 8b 1b 48 89 df e8 5c d6 ec 03 48
RSP: 0018:ffffc9000c06fc20 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900040f9000
RDX: 0000000000000000 RSI: ffffffff87d12ece RDI: ffff88802a045290
RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000002 R11: 0000000000000000 R12: ffffffff90256060
R13: ffff88802d047540 R14: ffff88802a044c00 R15: ffffffff8cb7ccc0
FS:  00007f022162a6c0(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fef3af57e20 CR3: 0000000037d0d000 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 f9 00 00 00    	jne    0x106
   d:	48 8b 9b 90 06 00 00 	mov    0x690(%rbx),%rbx
  14:	e8 72 31 39 fa       	call   0xfa39318b
  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 c5 00 00 00    	jne    0xf9
  34:	48 8b 1b             	mov    (%rbx),%rbx
  37:	48 89 df             	mov    %rbx,%rdi
  3a:	e8 5c d6 ec 03       	call   0x3ecd69b
  3f:	48                   	rex.W