------------[ cut here ]------------
kernfs: can not remove 'nr_tags', no directory
WARNING: CPU: 0 PID: 5650 at fs/kernfs/dir.c:1675 kernfs_remove_by_name_ns+0xfe/0x160 fs/kernfs/dir.c:1674
Modules linked in:
CPU: 0 PID: 5650 Comm: syz-executor.0 Not tainted 6.8.0-rc6-syzkaller-g5ad3cb0ed525 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:kernfs_remove_by_name_ns+0xfe/0x160 fs/kernfs/dir.c:1674
Code: 48 89 df e8 24 ee ff ff 48 89 df e8 6c 8f ff ff 31 db eb 2b e8 b3 60 65 ff 90 48 c7 c7 80 d2 ba 8b 4c 89 e6 e8 83 6b 29 ff 90 <0f> 0b 90 90 bb fe ff ff ff eb 12 e8 92 60 65 ff bb fe ff ff ff 4c
RSP: 0018:ffffc9000a127980 EFLAGS: 00010246
RAX: 0b780b51db8f6000 RBX: ffffffff8e7cca80 RCX: ffff88807bf6bb80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff815779c2 R09: 1ffff92001424e84
R10: dffffc0000000000 R11: fffff52001424e85 R12: ffffffff8bfbd020
R13: 0000000000000000 R14: ffffffff8bfbcfc0 R15: 0000000000000000
FS:  00007f15e94d26c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d0c637440 CR3: 0000000020328000 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/0x2b0 fs/sysfs/group.c:292
 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:316
 __kobject_del+0x84/0x310 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+0x228/0x300 block/blk-mq-sysfs.c:283
 __blk_mq_update_nr_hw_queues block/blk-mq.c:4759 [inline]
 blk_mq_update_nr_hw_queues+0x61b/0x1a20 block/blk-mq.c:4805
 nbd_start_device+0x17b/0xc50 drivers/block/nbd.c:1378
 nbd_start_device_ioctl drivers/block/nbd.c:1429 [inline]
 __nbd_ioctl drivers/block/nbd.c:1504 [inline]
 nbd_ioctl+0x5dc/0xf40 drivers/block/nbd.c:1544
 blkdev_ioctl+0x5e5/0x740 block/ioctl.c:634
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:857
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f15e827ad39
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:00007f15e94d20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f15e839bf80 RCX: 00007f15e827ad39
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
RBP: 00007f15e94d2120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007f15e839bf80 R15: 00007ffcdefb2348
 </TASK>