[dolphin] [Bug 424704] New: Can not umount large USB-stick due to active thumbnail.so

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=424704

            Bug ID: 424704
           Summary: Can not umount large USB-stick due to active
                    thumbnail.so
           Product: dolphin
           Version: 20.04.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: opensuse.lietuviu.kalba at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
If I put large USB medium into my computer and open in Dolphin, some background
process starts and it prevents us from un-mounting device.


STEPS TO REPRODUCE
1. Put large USB medium with a lot of files into computer and open it in
Dolphin
2. After few time (seconds or minute) try umount/eject it

OBSERVED RESULT
Dolphin says: 
One or more files in this device are opened in program
"dolphintvmYuY.9.slave-socket". (This is free translation from Lithuanian into
English – not exact wording)
I see active process: /usr/lib64/qt5/plugins/kf5/kio/thumbnail.so
Device is still mounted.

EXPECTED RESULT
Any low priority background process (e.g. thumbnail.so) must be killed
immediately.
Device should be umounted.

SOFTWARE/OS VERSIONS
Operating System: openSUSE Leap 15.2
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.71.0
Qt Version: 5.12.7
Kernel Version: 5.3.18-lp152.29-default
OS Type: 64-bit

ADDITIONAL INFORMATION
Tested USB medium has 64GB, is near full, contains ~5000 files and ~400
directories.

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