我在我的一个系统上收到了许多这样的消息：
[ 348.515157] EXT4-fs (vda9): VFS: Can't find ext4 filesystem
[ 348.517587] EXT4-fs (vda9): VFS: Can't find ext4 filesystem
[ 348.519944] EXT4-fs (vda9): VFS: Can't find ext4 filesystem
[ 348.522487] squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on vda9
[ 348.524974] FAT-fs (vda9): bogus number of reserved sectors
[ 348.525946] FAT-fs (vda9): Can't find a valid FAT filesystem
[ 348.533493] XFS (vda9): Invalid superblock magic number
[ 348.536738] FAT-fs (vda9): bogus number of reserved sectors
[ 348.537781] FAT-fs (vda9): Can't find a valid FAT filesystem
[ 348.543638] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device vda9.
[ 348.546068] hfsplus: unable to find HFS+ superblock
[ 348.547531] qnx4: no qnx4 filesystem (no root dir).
[ 348.549902] ufs: You didn't specify the type of your ufs filesystem
mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
>>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
[ 348.557643] ufs: ufs_fill_super(): bad magic number
[ 348.561613] hfs: can't find a HFS filesystem on dev vda9
磁盘如下所示：
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 6001GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 6001GB 6001GB zfs zfs-5514fd574fd36816
9 6001GB 6001GB 8389kB
它是 KVM/Qemu 系统 (Proxmox) 上带有 VirtIO 磁盘的 Ubuntu-VM。它工作正常，但我不明白这里发生了什么。
我怎样才能解决这个问题？谢谢！