overlay: filesystem on ./file0 is read-only
comedi comedi3: c6xdigio: I/O port conflict (0x4f27,3)
Oops: general protection fault, probably for non-canonical address 0xed25e9cd2c4e65ea: 0000 [#1] SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0x692f6e6962732f50-0x692f6e6962732f57]
CPU: 3 UID: 0 PID: 3054 Comm: syz.8.7474 Not tainted syzkaller #0 PREEMPT(full) 
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_root+0x67/0x2a0 fs/kernfs/kernfs-internal.h:76
Code: 89 c6 e8 7c f8 5b ff 58 85 db 0f 85 b7 00 00 00 e8 2e fd 5b ff 48 8d 7d 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 02 00 00 48 8b 5d 30 e8 c6 32 32 09 31 ff 41
RSP: 0018:ffffc90020b5f6e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc9000c5b2000
RDX: 0d25edcd2c4e65ea RSI: ffffffff825f0e42 RDI: 692f6e6962732f50
RBP: 692f6e6962732f20 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c427240
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88804234a800
FS:  0000000000000000(0000) GS:ffff8880977bd000(0063) knlGS:00000000f5416b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7334884 CR3: 000000006e8a9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kernfs_remove_by_name_ns+0x2e/0x110 fs/kernfs/dir.c:1711
 sysfs_remove_file include/linux/sysfs.h:777 [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:605 [inline]
 bus_remove_driver+0x224/0x2c0 drivers/base/bus.c:743
 driver_unregister+0x76/0xb0 drivers/base/driver.c:277
 comedi_device_detach_locked+0x12c/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/0x2f00 drivers/comedi/comedi_fops.c:2178
 comedi_compat_ioctl+0x1d0/0x990 drivers/comedi/comedi_fops.c:3249
 __do_compat_sys_ioctl fs/ioctl.c:696 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:639 [inline]
 __ia32_compat_sys_ioctl+0x23f/0x370 fs/ioctl.c:639
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f12579
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:00000000f541655c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000040946400
RDX: 00000000800000c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kernfs_root+0x67/0x2a0 fs/kernfs/kernfs-internal.h:76
Code: 89 c6 e8 7c f8 5b ff 58 85 db 0f 85 b7 00 00 00 e8 2e fd 5b ff 48 8d 7d 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 02 00 00 48 8b 5d 30 e8 c6 32 32 09 31 ff 41
RSP: 0018:ffffc90020b5f6e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc9000c5b2000
RDX: 0d25edcd2c4e65ea RSI: ffffffff825f0e42 RDI: 692f6e6962732f50
RBP: 692f6e6962732f20 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c427240
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88804234a800
FS:  0000000000000000(0000) GS:ffff8880976bd000(0063) knlGS:00000000f5416b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f71e33f4 CR3: 000000006e8a9000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	89 c6                	mov    %eax,%esi
   2:	e8 7c f8 5b ff       	call   0xff5bf883
   7:	58                   	pop    %rax
   8:	85 db                	test   %ebx,%ebx
   a:	0f 85 b7 00 00 00    	jne    0xc7
  10:	e8 2e fd 5b ff       	call   0xff5bfd43
  15:	48 8d 7d 30          	lea    0x30(%rbp),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 1a 02 00 00    	jne    0x24e
  34:	48 8b 5d 30          	mov    0x30(%rbp),%rbx
  38:	e8 c6 32 32 09       	call   0x9323303
  3d:	31 ff                	xor    %edi,%edi
  3f:	41                   	rex.B