https://bugs.kde.org/show_bug.cgi?id=512148
Bug ID: 512148
Summary: Qt apps crash without manually setting Qt environment
variables
Classification: Plasma
Product: plasmashell
Version First 6.5.2
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: generic-crash
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
SUMMARY
Any Qt apps, including the plasma-shell and SDDM crashes without setting the
following environment variables manually:
QT_PLUGIN_PATH=/usr/lib/qt6/plugins
QML2_IMPORT_PATH=/usr/lib/qt6/qml
Previously, it was working fine, I suspect this happened after an update. I set
these variables in `/etc/environment` temporarily as a workaround, as it causes
Qt apps that use other installations to crash similarly.
Login via GDM into Gnome desktop works fine, but KDE apps still won't work
without setting these variables.
STEPS TO REPRODUCE
1. Boot the system.
2. Login to Plasma
OBSERVED RESULT
No desktop. Qt paths are not found by apps automatically.
EXPECTED RESULT
Desktop. Apps can find plugin paths automatically.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.5.2
KDE Frameworks Version:
Qt Version: 6.10.0
ADDITIONAL INFORMATION
SDDM crash log in case it is useful.
```
Kas 15 09:42:24 bilal-pc systemd[1]: Started Authorization Manager.
Kas 15 09:42:24 bilal-pc polkitd[1209]: Acquired the name
org.freedesktop.PolicyKit1 on the system bus
Kas 15 09:42:25 bilal-pc sddm-helper-start-wayland[1141]: Directory
"/run/user/615" has changed, checking for Wayland socket
Kas 15 09:42:25 bilal-pc sddm-helper-start-wayland[1141]: Directory
"/run/user/615" has changed, checking for Wayland socket
Kas 15 09:42:25 bilal-pc sddm-helper-start-wayland[1141]: Directory
"/run/user/615" has changed, checking for Wayland socket
Kas 15 09:42:25 bilal-pc sddm-helper-start-wayland[1141]: Found Wayland socket
"/run/user/615/wayland-0"
Kas 15 09:42:25 bilal-pc sddm-helper-start-wayland[1141]: "Accepting client
connections on sockets: QList(\"wayland-0\")\n"
Kas 15 09:42:25 bilal-pc gjs[1140]: JS LOG: current connection: null
Kas 15 09:42:25 bilal-pc sddm-greeter-qt6[1230]: High-DPI autoscaling Enabled
Kas 15 09:42:25 bilal-pc sddm-greeter-qt6[1230]: Could not find the Qt platform
plugin "wayland" in ""
Kas 15 09:42:25 bilal-pc sddm-greeter-qt6[1230]: This application failed to
start because no Qt platform plugin could be initialized. Re>
Kas 15 09:42:25 bilal-pc systemd-coredump[1238]: Process 1230 (sddm-greeter-qt)
of user 615 terminated abnormally with signal 6/ABRT, pr>
Kas 15 09:42:25 bilal-pc systemd[1]: Created slice Slice
/system/drkonqi-coredump-processor.
Kas 15 09:42:25 bilal-pc systemd[1]: Created slice Slice
/system/systemd-coredump.
Kas 15 09:42:25 bilal-pc systemd[1]: Started Process Core Dump (PID 1238/UID
0).
Kas 15 09:42:25 bilal-pc systemd[1]: Started Pass systemd-coredump journal
entries to relevant user for potential DrKonqi handling.
Kas 15 09:42:25 bilal-pc dockerd[1107]:
time="2025-11-15T09:42:25.105826191-08:00" level=info msg="Loading containers:
start."
Kas 15 09:42:25 bilal-pc kernel: Initializing XFRM netlink socket
Kas 15 09:42:25 bilal-pc systemd-coredump[1242]: [🡕] Process 1230
(sddm-greeter-qt) of user 615 dumped core.
Stack trace of thread 1230:
#0 0x00007faa09e9890c n/a
(libc.so.6 + 0x9890c)
#1 0x00007faa09e3e3a0 raise
(libc.so.6 + 0x3e3a0)
#2 0x00007faa09e2557a abort
(libc.so.6 + 0x2557a)
#3 0x00007faa0a69348c n/a
(libQt6Core.so.6 + 0x9348c)
#4 0x00007faa0a694250
_ZNK14QMessageLogger5fatalEPKcz (libQt6Core.so.6 + 0x94250)
#5 0x00007faa0b0e5fed n/a
(libQt6Gui.so.6 + 0xe5fed)
#6 0x00007faa0b19f438
_ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt6Gui.>
#7 0x00007faa0a76ea05
_ZN23QCoreApplicationPrivate4initEv (libQt6Core.so.6 + 0x16ea05)
#8 0x00007faa0b19f4ce
_ZN22QGuiApplicationPrivate4initEv (libQt6Gui.so.6 + 0x19f4ce)
#9 0x00007faa0b1a068e
_ZN15QGuiApplicationC2ERiPPci (libQt6Gui.so.6 + 0x1a068e)
#10 0x00005579106dfaf1 n/a
(/usr/bin/sddm-greeter-qt6 + 0x13af1)
#11 0x00007faa09e27635 n/a
(libc.so.6 + 0x27635)
#12 0x00007faa09e276e9
__libc_start_main (libc.so.6 + 0x276e9)
#13 0x00005579106e29e5 n/a
(/usr/bin/sddm-greeter-qt6 + 0x169e5)
ELF object binary
architecture: AMD x86-64
Kas 15 09:42:25 bilal-pc sddm-helper-start-wayland[1141]: wayland greeter
finished 6 QProcess::CrashExit
Kas 15 09:42:25 bilal-pc sddm-helper-start-wayland[1141]: quitting
helper-start-wayland
Kas 15 09:42:25 bilal-pc sddm-helper-start-wayland[1141]: Stopping...
"kwin_wayland"
```
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