https://bugs.kde.org/show_bug.cgi?id=414956

            Bug ID: 414956
           Summary: cryfs vault unresponsive for a long time after mount
           Product: Plasma Vault
           Version: unspecified
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: ivan.cu...@kde.org
          Reporter: bara...@pm.me
  Target Milestone: ---

SUMMARY
After mounting the vault I get the following notification:
"Filesystem is not responding: filesystem mounted at '<path>' is not
responding."
Trying to access it through dolphin causes dolphin to become completely stuck
(terminating doesn't work, not even with `kill -9`). This could be a similar
problem to the unresolved bug #409494.  
After a long time the directory becomes accessible but very slow. On one
occasion it even caused a complete system freeze that required a hard reboot
(very long time with no response, even REISUB failed). 
Trying to unmount the vault during the long period of time (circa 20-30
minutes) that it is unresponsive gives an error in the vaults applet ("device
is being used by another application" or something of the sort) and the
mount/unmount icon toggles at a very high frequency until it is resolved. 

STEPS TO REPRODUCE
1. Create a vault with the base directory and mount point located in a custom
location outside the OS's HD.
2. Copy a large number of files weighing a couple of hundreds of GBs into the
vault.
3. Mount vault and try to access. 

OBSERVED RESULT
Dolphin freezes, vault is inaccessible, it is impossible to unmount vault. 

EXPECTED RESULT
Vault is promptly mounted and contained data is accessible. Unmounting is
possible on command.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 19.10
(available in About System)
KDE Plasma Version: 5.16.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.4

ADDITIONAL INFORMATION
cryfs encoding scheme. Large number of files (altogether ~400GB, if that could
be relevant). Also, the base directory as well as the mount point are not on
the main SSD hard-drive on which the OS is installed, but on a separate HDD. 
Using cryfs to access the directory in the terminal works fine.

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