------------[ cut here ]------------
kernfs: can not remove 'nr_tags', no directory
WARNING: CPU: 0 PID: 5202 at fs/kernfs/dir.c:1662 kernfs_remove_by_name_ns+0x106/0x120 fs/kernfs/dir.c:1662
Modules linked in:
CPU: 0 PID: 5202 Comm: syz-executor102 Not tainted 6.6.0-syzkaller-14578-g1cfb751165ef #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kernfs_remove_by_name_ns+0x106/0x120 fs/kernfs/dir.c:1662
Code: 1e 50 ff e8 dc 37 71 ff bb fe ff ff ff 89 d8 5b 5d 41 5c 41 5d c3 e8 c9 37 71 ff 4c 89 e6 48 c7 c7 60 3b e0 8a e8 9a ce 36 ff <0f> 0b eb d5 e8 a1 68 c7 ff e9 60 ff ff ff e8 97 68 c7 ff e9 27 ff
RSP: 0018:ffffc900035afa40 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814d2b09
RDX: ffff8880229fdb40 RSI: ffffffff814d2b16 RDI: 0000000000000001
RBP: ffffffff8d9c08c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 203a73666e72656b R12: ffffffff8b2bf4e0
R13: 0000000000000000 R14: ffffffff8b2bf400 R15: 0000000000000008
FS:  00007f836f7fe6c0(0000) GS:ffff88806b600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f836f8a8ba4 CR3: 000000001d204000 CR4: 0000000000350ef0
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+0x96/0x1c0 fs/sysfs/group.c:28
 sysfs_remove_group+0x8b/0x170 fs/sysfs/group.c:292
 sysfs_remove_groups fs/sysfs/group.c:316 [inline]
 sysfs_remove_groups+0x60/0xa0 fs/sysfs/group.c:308
 __kobject_del+0x83/0x1e0 lib/kobject.c:592
 kobject_del lib/kobject.c:624 [inline]
 kobject_del+0x3f/0x60 lib/kobject.c:616
 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+0x257/0x2d0 block/blk-mq-sysfs.c:283
 __blk_mq_update_nr_hw_queues block/blk-mq.c:4727 [inline]
 blk_mq_update_nr_hw_queues+0x8a7/0x1350 block/blk-mq.c:4773
 nbd_start_device+0x157/0xd70 drivers/block/nbd.c:1362
 nbd_start_device_ioctl drivers/block/nbd.c:1412 [inline]
 __nbd_ioctl drivers/block/nbd.c:1487 [inline]
 nbd_ioctl+0x21a/0xd60 drivers/block/nbd.c:1527
 blkdev_ioctl+0x2f9/0x770 block/ioctl.c:633
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f836f840569
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f836f7fe208 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f836f8c7408 RCX: 00007f836f840569
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
RBP: 00007f836f8c7400 R08: 00007f836f7fdfa6 R09: 0000000000003331
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f836f8941a4
R13: 00007f836f7fe210 R14: 0000000000000002 R15: 64626e2f7665642f
 </TASK>