unmount issue

[realwakka]

[40827.735150] ------------[ cut here ]------------
[40827.735152] WARNING: CPU: 6 PID: 3693 at fs/inode.c:1711 iput.part.0+0x1af/0x1e0
[40827.735158] Modules linked in: sidongfs(OE) dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua intel_rapl_msr intel_rapl_common kvm_intel kvm btrfs snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi rapl snd_hda_codec joydev snd_hda_core snd_hwdep snd_pcm input_leds blake2b_generic snd_timer zstd_compress snd serio_raw soundcore mac_hid qemu_fw_cfg sch_fq_codel virtio_rng ip_tables x_tables autofs4 raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear qxl drm_ttm_helper ttm drm_kms_helper syscopyarea sysfillrect sysimgblt hid_generic fb_sys_fops cec usbhid hid drm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel psmouse ahci aesni_intel i2c_i801 crypto_simd i2c_smbus libahci cryptd virtio_net net_failover lpc_ich virtio_blk failover [last unloaded: sidongfs]
[40827.735192] CPU: 6 PID: 3693 Comm: umount Tainted: G        W  OE     5.17.0-rc8+ #17
[40827.735193] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014
[40827.735197] RIP: 0010:iput.part.0+0x1af/0x1e0
[40827.735198] Code: c3 49 8b 8c 24 98 00 00 00 eb a1 85 d2 74 9d 49 83 bc 24 e0 00 00 00 00 74 92 a9 00 00 01 00 0f 85 49 ff ff ff e9 3a ff ff ff <0f> 0b e9 07 ff ff ff 4c 89 e7 be 01 00 00 00 e8 dd f3 ff ff 4c 89
[40827.735200] RSP: 0018:ffffaf6d40693d20 EFLAGS: 00010202
[40827.735202] RAX: 0000000000000008 RBX: ffff9427cbaaa000 RCX: 0000000000000008
[40827.735202] RDX: 0000000000000001 RSI: ffffffffc0a04140 RDI: ffffffff94ffea97
[40827.735203] RBP: ffffaf6d40693d38 R08: 0000000000000001 R09: 0000000000000064
[40827.735204] R10: 0000000000000000 R11: ffff9427004026a0 R12: ffff942703638780
[40827.735204] R13: ffff942703638808 R14: ffff94270ac74d80 R15: ffff9427cd069940
[40827.735215] FS:  00007f7fb0114840(0000) GS:ffff942877f80000(0000) knlGS:0000000000000000
[40827.735216] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[40827.735217] CR2: 0000559b12326018 CR3: 0000000102bea006 CR4: 0000000000770ee0
[40827.735219] PKRU: 55555554
[40827.735220] Call Trace:
[40827.735221]  <TASK>
[40827.735223]  iput+0x1c/0x30
[40827.735232]  dentry_unlink_inode+0xc6/0x120
[40827.735234]  __dentry_kill+0xdd/0x180
[40827.735235]  dput+0x1ab/0x300
[40827.735238]  do_one_tree+0x35/0x40
[40827.735239]  shrink_dcache_for_umount+0x2d/0x90
[40827.735240]  generic_shutdown_super+0x1f/0x120
[40827.735241]  kill_block_super+0x27/0x50
[40827.735242]  deactivate_locked_super+0x32/0x80
[40827.735260]  deactivate_super+0x3e/0x50
[40827.735261]  cleanup_mnt+0x109/0x160
[40827.735263]  __cleanup_mnt+0x12/0x20
[40827.735264]  task_work_run+0x64/0xa0
[40827.735266]  exit_to_user_mode_prepare+0x1cb/0x1d0
[40827.735268]  syscall_exit_to_user_mode+0x27/0x50
[40827.735270]  ? __x64_sys_umount+0x16/0x20
[40827.735271]  do_syscall_64+0x48/0xc0
[40827.735273]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[40827.735274] RIP: 0033:0x7f7fb037319b
[40827.735276] Code: cc 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c5 cc 0c 00 f7 d8 64 89 01 48
[40827.735277] RSP: 002b:00007ffdeaee9ba8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
[40827.735278] RAX: 0000000000000000 RBX: 00007f7fb04a5204 RCX: 00007f7fb037319b
[40827.735278] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000559b12326cf0
[40827.735279] RBP: 0000559b1231e4f0 R08: 0000000000000000 R09: 00007ffdeaee8950
[40827.735280] R10: 00007f7fb0491379 R11: 0000000000000246 R12: 0000559b12326cf0
[40827.735280] R13: 0000000000000000 R14: 0000559b1231e5e8 R15: 0000559b1231e700
[40827.735281]  </TASK>
[40827.735284] ---[ end trace 0000000000000000 ]---
[40827.735309] VFS: Busy inodes after unmount of vdb. Self-destruct in 5 seconds.  Have a nice day...