[dolphin] [Bug 493471] New: Dolphin hangs when big files (8GB+) are copied to a SMB share when Thumbnailer for such big files is enabled

[Sebastian Hirsch]

https://bugs.kde.org/show_bug.cgi?id=493471

            Bug ID: 493471
           Summary: Dolphin hangs when big files (8GB+) are copied to a
                    SMB share when Thumbnailer for such big files is
                    enabled
    Classification: Applications
           Product: dolphin
           Version: 24.08.0
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: klaussemmler at disroot.org
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY

Since version 24.08.0, when I copy large files to my SMB share (8GB+), dolphin
will hang multiple times when copying the file. The file manager and copy
progress notifications hang for some seconds and get responsive again. This
happens multiple times while copying a file. The speed of the file copy does
not slow down because of the hangs. If I copy the file with Krusader, this does
not happen. If I copy it with the thumbnailer disabled for remote sources, this
also does not happen. Dolphin only hangs if I copy the file to the smb share,
not from it. Dolphin version 24.04.3 does not exhibit this issue.

STEPS TO REPRODUCE

1. Open Dolphin.
2. Enable the thumbnailer for remote sources and set the file size limit to a
value, where the thumbnailer will create a thumbnail for the file that will be
copied to the SMB share.
3. Select a file with a size of 8GB or more, where the thumbnailers can create
a thumbnail for it.
4. Copy the file to the SMB share.

OBSERVED RESULT

Dolphin hangs multiple times while the file gets copied.

EXPECTED RESULT

Dolphin does not hang while the file gets copied.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 

Operating System: Fedora Linux 40
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2
Kernel Version: 6.10.10-200.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600 6-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 6600

ADDITIONAL INFORMATION

The NAS with the SMB share runs Openmediavault 7.4.8. And uses, like my desktop
a 10Gbit Aquantia network card.

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