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Unexpected driver unregister!
WARNING: drivers/base/driver.c:273 at 0x0, CPU#1: syz.3.1632/11481
Modules linked in:
CPU: 1 UID: 0 PID: 11481 Comm: syz.3.1632 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~bpo12+1 04/01/2014
RIP: 0010:driver_unregister drivers/base/driver.c:273 [inline]
RIP: 0010:driver_unregister+0x89/0xb0 drivers/base/driver.c:270
Code: 00 75 3a 48 8b 73 68 48 89 ef e8 32 4d 88 fc 48 89 df e8 1a 94 ff ff 5b 5d e9 73 43 dd fb e8 6e 43 dd fb 48 8d 3d 27 ad b0 0a <67> 48 0f b9 3a 5b 5d e9 5b 43 dd fb e8 a6 4d 46 fc eb 9a e8 9f 4d
RSP: 0018:ffffc90003a5f9a0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffffff8ff4c3e0 RCX: ffffffff88c61b9b
RDX: ffff888036cf4980 RSI: ffffffff85e0c132 RDI: ffffffff90916e60
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 000000001779899c R12: ffffffff8ff4c320
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888025488000
FS:  00007f14f008a6c0(0000) GS:ffff8880d6a69000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005474f000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 comedi_device_detach_locked+0x12f/0xa50 drivers/comedi/drivers.c:207
 comedi_device_detach+0x67/0xb0 drivers/comedi/drivers.c:215
 comedi_device_attach+0x43d/0x900 drivers/comedi/drivers.c:1011
 do_devconfig_ioctl+0x1b1/0x710 drivers/comedi/comedi_fops.c:872
 comedi_unlocked_ioctl+0x165d/0x2ee0 drivers/comedi/comedi_fops.c:2178
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f14ef18f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f14f008a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f14ef3e5fa0 RCX: 00007f14ef18f7c9
RDX: 0000200000000540 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f14ef213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f14ef3e6038 R14: 00007f14ef3e5fa0 R15: 00007ffebdb533e8
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 75 3a             	add    %dh,0x3a(%rbp)
   3:	48 8b 73 68          	mov    0x68(%rbx),%rsi
   7:	48 89 ef             	mov    %rbp,%rdi
   a:	e8 32 4d 88 fc       	call   0xfc884d41
   f:	48 89 df             	mov    %rbx,%rdi
  12:	e8 1a 94 ff ff       	call   0xffff9431
  17:	5b                   	pop    %rbx
  18:	5d                   	pop    %rbp
  19:	e9 73 43 dd fb       	jmp    0xfbdd4391
  1e:	e8 6e 43 dd fb       	call   0xfbdd4391
  23:	48 8d 3d 27 ad b0 0a 	lea    0xab0ad27(%rip),%rdi        # 0xab0ad51
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	5b                   	pop    %rbx
  30:	5d                   	pop    %rbp
  31:	e9 5b 43 dd fb       	jmp    0xfbdd4391
  36:	e8 a6 4d 46 fc       	call   0xfc464de1
  3b:	eb 9a                	jmp    0xffffffd7
  3d:	e8                   	.byte 0xe8
  3e:	9f                   	lahf
  3f:	4d                   	rex.WRB