syzbot

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DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 1 PID: 8840 at kernel/locking/lockdep.c:238 hlock_class kernel/locking/lockdep.c:238 [inline]
WARNING: CPU: 1 PID: 8840 at kernel/locking/lockdep.c:238 hlock_class+0x64/0x70 kernel/locking/lockdep.c:227
Modules linked in:
CPU: 1 UID: 0 PID: 8840 Comm: syz.4.747 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline]
RIP: 0010:hlock_class+0x64/0x70 kernel/locking/lockdep.c:227
Code: ff 90 e8 af 83 47 03 85 c0 74 23 8b 05 a5 75 14 0f 85 c0 75 19 90 48 c7 c6 5c bd e2 8d 48 c7 c7 14 69 e1 8d e8 4d db e2 ff 90 <0f> 0b 90 90 90 eb c9 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003ddf7f0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: ffff88801db3e4f0 RCX: ffffc90011cf0000
RDX: 0000000000080000 RSI: ffffffff817a4395 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 000000002d2d2d2d R12: ffff88801db3e540
R13: ffff88801db3da00 R14: 0000000000000000 R15: ffffffff8b4f5018
FS:  00007f8cba7916c0(0000) GS:ffff8881247b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2cf199 CR3: 000000004afa1000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 check_wait_context kernel/locking/lockdep.c:4854 [inline]
 __lock_acquire+0x218/0x1ce0 kernel/locking/lockdep.c:5187
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
 down_write+0x92/0x200 kernel/locking/rwsem.c:1590
 kernfs_remove_by_name_ns+0x3d/0x110 fs/kernfs/dir.c:1712
 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+0x12f/0xa50 drivers/comedi/drivers.c:207
 do_devconfig_ioctl+0x555/0x710 drivers/comedi/comedi_fops.c:848
 comedi_unlocked_ioctl+0x165d/0x2f00 drivers/comedi/comedi_fops.c:2178
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8cbc98eba9
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:00007f8cba791038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8cbcbd6270 RCX: 00007f8cbc98eba9
RDX: 0000000000000000 RSI: 0000000040946400 RDI: 000000000000000b
RBP: 00007f8cbca11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8cbcbd6308 R14: 00007f8cbcbd6270 R15: 00007ffccf022c68
 </TASK>