------------[ cut here ]------------
kernfs: can not remove 'nr_tags', no directory
WARNING: CPU: 1 PID: 3707 at fs/kernfs/dir.c:1579 kernfs_remove_by_name_ns+0xed/0x110 fs/kernfs/dir.c:1579
Modules linked in:
CPU: 1 PID: 3707 Comm: syz-executor309 Not tainted 6.0.0-rc2-next-20220826-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:kernfs_remove_by_name_ns+0xed/0x110 fs/kernfs/dir.c:1579
Code: c3 e8 f7 c3 7d ff 4c 89 e7 41 bc fe ff ff ff e8 f9 1b 60 ff eb da e8 e2 c3 7d ff 4c 89 ee 48 c7 c7 e0 92 ff 89 e8 9c de 41 07 <0f> 0b 41 bc fe ff ff ff eb bc e8 04 76 ca ff e9 71 ff ff ff e8 fa
RSP: 0018:ffffc90003e1fa38 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffffff8c87e668 RCX: 0000000000000000
RDX: ffff88801fb10000 RSI: ffffffff8161e578 RDI: fffff520007c3f39
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 203a73666e72656b R12: 0000000000000000
R13: ffffffff8a46fe00 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f2203f70700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005602ae0e7068 CR3: 000000001c8fb000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kernfs_remove_by_name include/linux/kernfs.h:615 [inline]
 remove_files+0x96/0x1c0 fs/sysfs/group.c:28
 sysfs_remove_group+0x87/0x170 fs/sysfs/group.c:288
 sysfs_remove_groups fs/sysfs/group.c:312 [inline]
 sysfs_remove_groups+0x5c/0xa0 fs/sysfs/group.c:304
 __kobject_del+0x89/0x1f0 lib/kobject.c:579
 kobject_del lib/kobject.c:611 [inline]
 kobject_del+0x3c/0x60 lib/kobject.c:603
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:181 [inline]
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:170 [inline]
 blk_mq_sysfs_unregister_hctxs+0x247/0x2c0 block/blk-mq-sysfs.c:302
 __blk_mq_update_nr_hw_queues block/blk-mq.c:4545 [inline]
 blk_mq_update_nr_hw_queues+0x489/0xdf0 block/blk-mq.c:4591
 nbd_start_device+0x153/0xc30 drivers/block/nbd.c:1357
 nbd_start_device_ioctl drivers/block/nbd.c:1407 [inline]
 __nbd_ioctl drivers/block/nbd.c:1481 [inline]
 nbd_ioctl+0x5a1/0xbd0 drivers/block/nbd.c:1521
 blkdev_ioctl+0x36e/0x800 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2203fcb5a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 18 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2203f702e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f22040484c0 RCX: 00007f2203fcb5a9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
RBP: 00007f22040153b4 R08: 0000000000000002 R09: 0000000000003932
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f22040484cc
R13: 00007f2203f702f0 R14: 00007f22040484c8 R15: 0000000000000002
 </TASK>