------------[ cut here ]------------
kernfs: can not remove 'nr_tags', no directory
WARNING: CPU: 1 PID: 8203 at fs/kernfs/dir.c:1683 kernfs_remove_by_name_ns+0x110/0x130 fs/kernfs/dir.c:1683
Modules linked in:
CPU: 1 UID: 0 PID: 8203 Comm: syz.4.619 Not tainted 6.13.0-rc2-syzkaller-00382-gdccbe2047a5b #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:kernfs_remove_by_name_ns+0x110/0x130 fs/kernfs/dir.c:1683
Code: 5f ff bb fe ff ff ff 89 d8 5b 5d 41 5c 41 5d c3 cc cc cc cc e8 c1 fa 5f ff 90 48 c7 c7 a0 10 82 8b 4c 89 e6 e8 51 35 20 ff 90 <0f> 0b 90 90 eb cd e8 f5 a8 c2 ff e9 54 ff ff ff e8 eb a8 c2 ff e9
RSP: 0018:ffffc90003f77848 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000c001000
RDX: 0000000000080000 RSI: ffffffff815a5086 RDI: 0000000000000001
RBP: ffffffff8ecbe460 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000006 R12: ffffffff8bcf9260
R13: 0000000000000000 R14: ffffffff8bcf9180 R15: 0000000000000004
FS:  00007f58d89f66c0(0000) GS:ffff88806a700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6ebdffffc CR3: 0000000047c58000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kernfs_remove_by_name include/linux/kernfs.h:625 [inline]
 remove_files+0x96/0x1c0 fs/sysfs/group.c:28
 sysfs_remove_group+0x8b/0x180 fs/sysfs/group.c:322
 sysfs_remove_groups fs/sysfs/group.c:346 [inline]
 sysfs_remove_groups+0x60/0xa0 fs/sysfs/group.c:338
 __kobject_del+0x89/0x1f0 lib/kobject.c:595
 kobject_del lib/kobject.c:627 [inline]
 kobject_del+0x3f/0x60 lib/kobject.c:619
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:155 [inline]
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:144 [inline]
 blk_mq_sysfs_unregister_hctxs+0x28b/0x350 block/blk-mq-sysfs.c:284
 __blk_mq_update_nr_hw_queues+0x64c/0x1590 block/blk-mq.c:5010
 blk_mq_update_nr_hw_queues+0x2a/0x40 block/blk-mq.c:5068
 nbd_start_device+0x15b/0xd70 drivers/block/nbd.c:1413
 nbd_start_device_ioctl drivers/block/nbd.c:1464 [inline]
 __nbd_ioctl drivers/block/nbd.c:1539 [inline]
 nbd_ioctl+0x21a/0xfd0 drivers/block/nbd.c:1579
 blkdev_ioctl+0x276/0x6d0 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl fs/ioctl.c:892 [inline]
 __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f58dab85d19
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:00007f58d89f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f58dad76080 RCX: 00007f58dab85d19
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004
RBP: 00007f58dac01a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f58dad76080 R15: 00007ffc1256d618
 </TASK>