[luksoid] mount: mounting /dev/mapper/uncrypted-loop0 on /mnt failed: Invalid argument #20

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1. maksym-anurin-push commented on Jun 9, 2026

   

   maksym-anurin-push

   on Jun 9, 2026

   Author

   More actions

   Trying to play...

   bash-5.1# mount /dev/mapper/uncrypted-loop0 /mnt
   mount: mounting /dev/mapper/uncrypted-loop0 on /mnt failed: Invalid argument
   
   bash-5.1# mount -t ext4 /dev/mapper/uncrypted-loop0 /mnt
   # Works!!!
   

   Full log:

   bash-5.1# losetup -a
   /dev/loop0: 0 /data/luksoid.img
   bash-5.1# cryptsetup status /dev/mapper/uncrypted-loop0 
   /dev/mapper/uncrypted-loop0 is active.
     type:    LUKS2
     cipher:  aes-xts-plain64
     keysize: 512 bits
     key location: keyring
     device:  /dev/loop0
     loop:    /data/luksoid.img
     sector size:  512
     offset:  32768 sectors
     size:    163840 sectors
     mode:    read/write
   bash-5.1# e2fsck /dev/mapper/uncrypted-loop0 
   e2fsck 1.46.6 (1-Feb-2023)
   /dev/mapper/uncrypted-loop0: clean, 11/20480 files, 10799/81920 blocks
   bash-5.1# mount /dev/mapper/uncrypted-loop0 /mnt
   mount: mounting /dev/mapper/uncrypted-loop0 on /mnt failed: Invalid argument
   bash-5.1# cat /proc/filesystems | grep ext4
   bash-5.1# mount -t ext4 /dev/mapper/uncrypted-loop0 /mnt
   bash-5.1# mount | grep uncrypted-loop0
   /dev/mapper/uncrypted-loop0 on /mnt type ext4 (rw,relatime)
   bash-5.1# blkid -o value -s TYPE /dev/mapper/uncrypted-loop0
   /dev/mapper/uncrypted-loop0: UUID="926d7f1f-be8d-4359-9d48-a37b45f333ab" TYPE="ext4"
   bash-5.1# cat /proc/filesystems
   nodev   sysfs
   nodev   tmpfs
   nodev   bdev
   nodev   proc
   nodev   cgroup
   nodev   cgroup2
   nodev   devtmpfs
   nodev   binfmt_misc
   nodev   debugfs
   nodev   tracefs
   nodev   securityfs
   nodev   sockfs
   nodev   bpf
   nodev   pipefs
   nodev   ramfs
   nodev   rpc_pipefs
   nodev   devpts
           vfat
   nodev   nfsd
   nodev   autofs
           fuseblk
   nodev   fuse
   nodev   fusectl
   nodev   virtiofs
   nodev   overlay
           erofs
   nodev   mqueue
           btrfs
           ext3
           ext2
           ext4
   
2. maksym-anurin-push commented on Jun 9, 2026

   

   maksym-anurin-push

   on Jun 9, 2026

   Author

   More actions

   bash-5.1# mount --help
   BusyBox v1.34.1 (2021-11-23 00:57:35 UTC) multi-call binary.
   
   Usage: mount [OPTIONS] [-o OPT] DEVICE NODE
   
   Mount a filesystem. Filesystem autodetection requires /proc.
   ...
   

   Looks like /proc does not contain necessary data in my environment
3. maksym-anurin-push

   added a commit that references this issue on Jun 9, 2026

   Fix FS type autodetection by add util-linux packet theanurin#20

   02ffa6d
4. theanurin

   added a commit that references this issue on Jun 9, 2026

   Fix FS type autodetection by add util-linux packet #20 (#21)

   e0bf69c