Bug 508961

open gwenview on commandline, is starts properly
Go to a folder with images
Sometimes, thumbnails are displayed correctly, but when gwenview is about to display an image (double-clicking on a thumbnail) it crashes.

Coredumpctl shows problems with /usr/libexec/kf6/kioworker and /usr/bin/gwenview, but a 'bt full' is not available due to 
No symbol table info available.
(gdb) quit


The only messages i get are:
$ gwenview
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/avci"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/hej2k"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/vnd.radiance"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-epson-erf"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-hasselblad-3fr"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-hasselblad-fff"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-leaf-mos"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-mamiya-mef"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-minolta-mdc"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-pfm"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-phaseone-iiq"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-phm"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-pxr"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-samsung-srw"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-sct"
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-sinar-sti"
org.kde.kdegraphics.gwenview.lib: Unresolved raw mime type  "image/x-samsung-srw"
QPainter::begin: Paint device returned engine == 0, type: 2
QPainter::setOpacity: Painter not active
QPainter::end: Painter not active, aborted
KCrash: Application 'kioworker' crashing... crashRecursionCounter = 2
KCrash: Application 'kioworker' crashing... crashRecursionCounter = 2
KCrash: Application 'kioworker' crashing... crashRecursionCounter = 2
QPropertyAnimation::updateState (opacity): Changing state of an animation without target
QPropertyAnimation::updateState (geometry): Changing state of an animation without target
KCrash: Application 'gwenview' crashing... crashRecursionCounter = 2
Segmentation fault (core dumped)


===
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.80
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.1
Kernel Version: 6.16.4-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland

nightly build, 
gwenview-libs-25.11.70~5.git1f1d64c-1.fc42.x86_64
gwenview-25.11.70~5.git1f1d64c-1.fc42.x86_64
kf6-kio-core-libs-6.18.0~12.gita8d2aaa-1.fc42.x86_64
kf6-kio-doc-6.18.0~12.gita8d2aaa-1.fc42.noarch
kf6-kio-gui-6.18.0~12.gita8d2aaa-1.fc42.x86_64
kf6-kio-core-6.18.0~12.gita8d2aaa-1.fc42.x86_64
kf6-kio-widgets-6.18.0~12.gita8d2aaa-1.fc42.x86_64
kf6-kio-widgets-libs-6.18.0~12.gita8d2aaa-1.fc42.x86_64
kf6-kio-file-widgets-6.18.0~12.gita8d2aaa-1.fc42.x86_64
kio-extras-25.11.70~12.git0b8f753-1.fc42.x86_64