------------[ cut here ]------------
kernfs: can not remove 'nr_tags', no directory
WARNING: CPU: 0 PID: 20642 at fs/kernfs/dir.c:1663 kernfs_remove_by_name_ns+0xfe/0x150 fs/kernfs/dir.c:1662
Modules linked in:
CPU: 0 PID: 20642 Comm: syz-executor.4 Not tainted 6.7.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:kernfs_remove_by_name_ns+0xfe/0x150 fs/kernfs/dir.c:1662
Code: 48 89 df e8 74 ee ff ff 48 89 df e8 9c 90 ff ff 31 db eb 2b e8 33 a5 6a ff 90 48 c7 c7 80 79 7a 8b 4c 89 e6 e8 c3 95 30 ff 90 <0f> 0b 90 90 bb fe ff ff ff eb 12 e8 12 a5 6a ff bb fe ff ff ff 4c
RSP: 0018:ffffc900080f79a0 EFLAGS: 00010246
RAX: 203f4310f6465f00 RBX: ffffffff8dfc66c0 RCX: ffff88802b243b80
RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff81546d22 R09: 0000000000200000
R10: 000000000000faad R11: fffff5200101ee89 R12: ffffffff8bbc17e0
R13: 0000000000000000 R14: ffffffff8bbc1780 R15: 0000000000000000
FS:  00007f9a24a036c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31925000 CR3: 000000009c2ec000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kernfs_remove_by_name include/linux/kernfs.h:623 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xfe/0x2a0 fs/sysfs/group.c:292
 sysfs_remove_groups+0x54/0xa0 fs/sysfs/group.c:316
 __kobject_del+0x7a/0x300 lib/kobject.c:592
 kobject_del+0x45/0x60 lib/kobject.c:624
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:155 [inline]
 blk_mq_sysfs_unregister_hctxs+0x22b/0x300 block/blk-mq-sysfs.c:283
 __blk_mq_update_nr_hw_queues block/blk-mq.c:4740 [inline]
 blk_mq_update_nr_hw_queues+0x61b/0x1a20 block/blk-mq.c:4786
 nbd_start_device+0x177/0xc40 drivers/block/nbd.c:1385
 nbd_start_device_ioctl drivers/block/nbd.c:1436 [inline]
 __nbd_ioctl drivers/block/nbd.c:1511 [inline]
 nbd_ioctl+0x5dc/0xf40 drivers/block/nbd.c:1551
 blkdev_ioctl+0x5cf/0x730 block/ioctl.c:633
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f9a23c7cce9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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:00007f9a24a030c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9a23d9bf80 RCX: 00007f9a23c7cce9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006
RBP: 00007f9a23cc947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9a23d9bf80 R15: 00007fff6dcc6758
 </TASK>