syzbot

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DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use))
WARNING: CPU: 1 PID: 23277 at kernel/locking/lockdep.c:5207 __lock_acquire+0xc0c/0xd20 kernel/locking/lockdep.c:5207
Modules linked in:
CPU: 1 UID: 0 PID: 23277 Comm: syz.7.4186 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__lock_acquire+0xc0c/0xd20 kernel/locking/lockdep.c:5207
Code: ff ff 90 e8 c6 bf e8 02 85 c0 74 22 83 3d 9f b0 df 0d 00 75 19 90 48 c7 c7 a4 35 8f 8d 48 c7 c6 e1 33 77 8d e8 85 be e5 ff 90 <0f> 0b 90 90 90 e9 8f 00 00 00 90 0f 0b 90 e9 8d fe ff ff 90 e8 8b
RSP: 0018:ffffc9000ec57870 EFLAGS: 00010046
RAX: dbc5179c5afe0300 RBX: ffff88802e969e40 RCX: 0000000000080000
RDX: ffffc90020891000 RSI: 0000000000002e08 RDI: 0000000000002e09
RBP: 0000000000000353 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba680 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88802e96a9c0 R15: 0000000000000000
FS:  00007f8a6aa326c0(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2b49a2 CR3: 000000007a7c9000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1590
 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
 do_devconfig_ioctl drivers/comedi/comedi_fops.c:848 [inline]
 comedi_unlocked_ioctl+0xcde/0x1020 drivers/comedi/comedi_fops.c:2178
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8a69b8f6c9
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:00007f8a6aa32038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8a69de5fa0 RCX: 00007f8a69b8f6c9
RDX: 0000000000000000 RSI: 0000000040946400 RDI: 0000000000000004
RBP: 00007f8a69c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8a69de6038 R14: 00007f8a69de5fa0 R15: 00007ffc76986608
 </TASK>