comedi comedi1: c6xdigio: I/O port conflict (0x6,3)
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BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: null-ptr-deref in atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4456 [inline]
BUG: KASAN: null-ptr-deref in rwsem_write_trylock kernel/locking/rwsem.c:268 [inline]
BUG: KASAN: null-ptr-deref in __down_write_common kernel/locking/rwsem.c:1316 [inline]
BUG: KASAN: null-ptr-deref in __down_write kernel/locking/rwsem.c:1326 [inline]
BUG: KASAN: null-ptr-deref in down_write+0xba/0x1f0 kernel/locking/rwsem.c:1591
Write of size 8 at addr 0000000000000118 by task syz.3.736/10947

CPU: 1 UID: 0 PID: 10947 Comm: syz.3.736 Not tainted 6.17.0-rc1-next-20250814-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4456 [inline]
 rwsem_write_trylock kernel/locking/rwsem.c:268 [inline]
 __down_write_common kernel/locking/rwsem.c:1316 [inline]
 __down_write kernel/locking/rwsem.c:1326 [inline]
 down_write+0xba/0x1f0 kernel/locking/rwsem.c:1591
 kernfs_remove_by_name_ns+0x3d/0x130 fs/kernfs/dir.c:1712
 remove_bind_files drivers/base/bus.c:605 [inline]
 bus_remove_driver+0x198/0x2f0 drivers/base/bus.c:743
 comedi_device_detach_locked+0x178/0x750 drivers/comedi/drivers.c:207
 comedi_device_detach drivers/comedi/drivers.c:215 [inline]
 comedi_device_attach+0x5d4/0x720 drivers/comedi/drivers.c:1010
 do_devconfig_ioctl drivers/comedi/comedi_fops.c:872 [inline]
 comedi_unlocked_ioctl+0x5ff/0x1020 drivers/comedi/comedi_fops.c:2173
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7468f8ebe9
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:00007f7469e2d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f74691b5fa0 RCX: 00007f7468f8ebe9
RDX: 0000200000000740 RSI: 0000000040946400 RDI: 0000000000000004
RBP: 00007f7469011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74691b6038 R14: 00007f74691b5fa0 R15: 00007ffc10257e78
 </TASK>
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