------------[ cut here ]------------
kernfs: can not remove 'nr_tags', no directory
WARNING: CPU: 1 PID: 6546 at fs/kernfs/dir.c:1707 kernfs_remove_by_name_ns+0xd1/0x130 fs/kernfs/dir.c:1706
Modules linked in:
CPU: 1 UID: 0 PID: 6546 Comm: syz-executor.0 Not tainted 6.16.0-rc4-syzkaller-g1f988d0788f5 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:kernfs_remove_by_name_ns+0xd1/0x130 fs/kernfs/dir.c:1706
Code: 4c 89 f7 e8 c1 f2 ff ff 4c 89 f7 e8 69 9b ff ff 31 ed eb 2b e8 c0 96 64 ff 90 48 c7 c7 c0 31 9c 8b 4c 89 f6 e8 80 3f 28 ff 90 <0f> 0b 90 90 bd fe ff ff ff eb 12 e8 9f 96 64 ff bd fe ff ff ff 48
RSP: 0018:ffffc90004d7f9c8 EFLAGS: 00010246
RAX: b370a3fdb2970f00 RBX: ffffffff8bdff800 RCX: ffff88802b275a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa9fc R12: 0000000000000000
R13: ffffffff8e88c0e0 R14: ffffffff8bdff860 R15: 0000000000000000
FS:  00007fd112c1d6c0(0000) GS:ffff888125d50000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd112c1cc98 CR3: 0000000074c9e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kernfs_remove_by_name include/linux/kernfs.h:633 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xfc/0x2c0 fs/sysfs/group.c:322
 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:346
 __kobject_del+0x84/0x300 lib/kobject.c:595
 kobject_del+0x45/0x60 lib/kobject.c:627
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:155 [inline]
 blk_mq_sysfs_unregister_hctxs+0x1fb/0x2b0 block/blk-mq-sysfs.c:277
 __blk_mq_update_nr_hw_queues block/blk-mq.c:4989 [inline]
 blk_mq_update_nr_hw_queues+0x25d/0x14c0 block/blk-mq.c:5043
 nbd_start_device+0x16c/0xac0 drivers/block/nbd.c:1476
 nbd_start_device_ioctl drivers/block/nbd.c:1527 [inline]
 __nbd_ioctl drivers/block/nbd.c:1602 [inline]
 nbd_ioctl+0x636/0xeb0 drivers/block/nbd.c:1642
 blkdev_ioctl+0x5a8/0x6d0 block/ioctl.c:704
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 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: 0033:0x7fd111a79b29
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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd112c1d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd111b8bf80 RCX: 00007fd111a79b29
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
RBP: 00007fd112c1d120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007fd111b8bf80 R15: 00007ffeb3db6fc8
 </TASK>