https://bugs.kde.org/show_bug.cgi?id=406460

            Bug ID: 406460
           Summary: Dolphin freezes or crashes when opening a mounted cifs
                    share over slow VPN
           Product: dolphin
           Version: 18.12.3
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-n...@kde.org
          Reporter: schuetze.christia...@gmail.com
                CC: elvis.angelac...@kde.org
  Target Milestone: ---

I'm using a mounted cifs share of my NAS and sometimes if I'm working remotely
(via VPN) using the share will freeze or crash dolphin. Using LAN is totally
fine and everything works as expected. Also if working remotely a standard
smb:// access is also working fine (if the connection is slow, it might show an
empty folder for some time before showing the contents, but it stays
responsive). However using the same share via mounted cifs share dolphin starts
freezing and suddenly also crashes as the connection is slow.

STEPS TO REPRODUCE
1. Mount a network cifs share (in my case freenas)
2. Connect to external network (in the best case for this to happen - a slow
one)
3. Connect to VPN
4. Access share (Open folders, quickly going up and down in the folder
structure)

OBSERVED RESULT
Dolphin is fetching the folders contents (while it fetches these the folder is
empty) and then starts freezing if I'm switching folders (most probably because
it fetches the subdirectory sizes) and might also crash after a short time of
unresponsiveness.

EXPECTED RESULT
Dolphin should never freeze or crash while accessing a mounted cifs share
remotely via VPN. Longer loading times should be indicated not by an empty
folder but a loading bar somewhere (maybe reuse of free space bar in the bottom
right like then access is done via smb://)

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE Tumbleweed 20190408
KDE Plasma Version:  5.15.4
KDE Frameworks Version: 5.56.0
Qt Version: 5.12.2

ADDITIONAL INFORMATION
This might not happen if the folders are small and contain only a few items or
the connection is good.

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