comedi comedi0: c6xdigio: I/O port conflict (0x1,3)
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kernfs: can not remove 'bind', no directory
WARNING: fs/kernfs/dir.c:1709 at 0x0, CPU#3: syz.0.3845/22833
Modules linked in:
CPU: 3 UID: 0 PID: 22833 Comm: syz.0.3845 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:kernfs_remove_by_name_ns+0xf8/0x100 fs/kernfs/dir.c:1709
Code: 00 09 e8 ab da 55 ff 48 89 df 31 db e8 a1 a2 ff ff 48 89 ef e8 b9 54 30 ff eb b1 e8 92 da 55 ff 48 8d 3d eb 44 25 0e 4c 89 ee <67> 48 0f b9 3a eb ba 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003e0f6f0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff85e03e72
RDX: ffff88802681a4c0 RSI: ffffffff8c2118c0 RDI: ffffffff908d16b0
RBP: ffffffff8f2ab780 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 000000005ad536ec R12: 0000000000000000
R13: ffffffff8c2118c0 R14: 0000000000000000 R15: ffff88804aa01800
FS:  0000000000000000(0000) GS:ffff888097a5b000(0063) knlGS:00000000f53ecb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f72e0bb4 CR3: 0000000071377000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 sysfs_remove_file include/linux/sysfs.h:780 [inline]
 driver_remove_file drivers/base/driver.c:201 [inline]
 driver_remove_file+0x4a/0x60 drivers/base/driver.c:197
 remove_bind_files drivers/base/bus.c:604 [inline]
 bus_remove_driver+0x224/0x2c0 drivers/base/bus.c:742
 driver_unregister+0x76/0xb0 drivers/base/driver.c:277
 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
 comedi_compat_ioctl+0x1d0/0x960 drivers/comedi/comedi_fops.c:3249
 __do_compat_sys_ioctl fs/ioctl.c:695 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:638 [inline]
 __ia32_compat_sys_ioctl+0x242/0x370 fs/ioctl.c:638
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xe8/0x680 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf701d579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f53ec55c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000040946400
RDX: 0000000080000540 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 09                	add    %cl,(%rcx)
   2:	e8 ab da 55 ff       	call   0xff55dab2
   7:	48 89 df             	mov    %rbx,%rdi
   a:	31 db                	xor    %ebx,%ebx
   c:	e8 a1 a2 ff ff       	call   0xffffa2b2
  11:	48 89 ef             	mov    %rbp,%rdi
  14:	e8 b9 54 30 ff       	call   0xff3054d2
  19:	eb b1                	jmp    0xffffffcc
  1b:	e8 92 da 55 ff       	call   0xff55dab2
  20:	48 8d 3d eb 44 25 0e 	lea    0xe2544eb(%rip),%rdi        # 0xe254512
  27:	4c 89 ee             	mov    %r13,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	eb ba                	jmp    0xffffffeb
  31:	90                   	nop
  32:	90                   	nop
  33:	90                   	nop
  34:	90                   	nop
  35:	90                   	nop
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop