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comedi comedi3: c6xdigio: I/O port conflict (0x10401,3)
BUG: unable to handle page fault for address: ffffffff9d77ea90
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD e189067 P4D e189067 PUD e18a063 PMD 0 
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 29708 Comm: syz.2.6373 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:222 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:233 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:__lock_acquire+0x4de/0x22f0 kernel/locking/lockdep.c:5207
Code: 5c 24 08 85 c0 4c 8b 4c 24 10 4c 8b 54 24 18 74 0e 8b 05 55 4c ed 0e 85 c0 0f 84 8e 06 00 00 90 31 c9 e9 1f fe ff ff 4d 63 c9 <4c> 0f a3 0d 4a bc 17 14 0f 82 62 ff ff ff 90 e8 2e 37 0a 03 85 c0
RSP: 0018:ffffc9000475f778 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffff88805ebbd528 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88805ebbd528 RDI: ffff88805ebbc980
RBP: ffff88805ebbc980 R08: ffffffff95b79660 R09: 000000003e38218c
R10: ffff88805ebbd4b0 R11: 0000000000000004 R12: 0000000000000000
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f36a61626c0(0000) GS:ffff88812497e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff9d77ea90 CR3: 0000000024b65000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
 down_write+0x92/0x200 kernel/locking/rwsem.c:1590
 kernfs_remove_by_name_ns+0x3d/0x100 fs/kernfs/dir.c:1712
 sysfs_remove_file include/linux/sysfs.h:770 [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+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: 0033:0x7f36a538f749
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:00007f36a6162038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f36a55e6090 RCX: 00007f36a538f749
RDX: 0000200000000080 RSI: 0000000040946400 RDI: 0000000000000005
RBP: 00007f36a5413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f36a55e6128 R14: 00007f36a55e6090 R15: 00007ffd7fb35ae8
 </TASK>
Modules linked in:
CR2: ffffffff9d77ea90
---[ end trace 0000000000000000 ]---
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:222 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:233 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:__lock_acquire+0x4de/0x22f0 kernel/locking/lockdep.c:5207
Code: 5c 24 08 85 c0 4c 8b 4c 24 10 4c 8b 54 24 18 74 0e 8b 05 55 4c ed 0e 85 c0 0f 84 8e 06 00 00 90 31 c9 e9 1f fe ff ff 4d 63 c9 <4c> 0f a3 0d 4a bc 17 14 0f 82 62 ff ff ff 90 e8 2e 37 0a 03 85 c0
RSP: 0018:ffffc9000475f778 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffff88805ebbd528 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88805ebbd528 RDI: ffff88805ebbc980
RBP: ffff88805ebbc980 R08: ffffffff95b79660 R09: 000000003e38218c
R10: ffff88805ebbd4b0 R11: 0000000000000004 R12: 0000000000000000
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f36a61626c0(0000) GS:ffff88812497e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff9d77ea90 CR3: 0000000024b65000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	5c                   	pop    %rsp
   1:	24 08                	and    $0x8,%al
   3:	85 c0                	test   %eax,%eax
   5:	4c 8b 4c 24 10       	mov    0x10(%rsp),%r9
   a:	4c 8b 54 24 18       	mov    0x18(%rsp),%r10
   f:	74 0e                	je     0x1f
  11:	8b 05 55 4c ed 0e    	mov    0xeed4c55(%rip),%eax        # 0xeed4c6c
  17:	85 c0                	test   %eax,%eax
  19:	0f 84 8e 06 00 00    	je     0x6ad
  1f:	90                   	nop
  20:	31 c9                	xor    %ecx,%ecx
  22:	e9 1f fe ff ff       	jmp    0xfffffe46
  27:	4d 63 c9             	movslq %r9d,%r9
* 2a:	4c 0f a3 0d 4a bc 17 	bt     %r9,0x1417bc4a(%rip)        # 0x1417bc7c <-- trapping instruction
  31:	14
  32:	0f 82 62 ff ff ff    	jb     0xffffff9a
  38:	90                   	nop
  39:	e8 2e 37 0a 03       	call   0x30a376c
  3e:	85 c0                	test   %eax,%eax