https://bugs.kde.org/show_bug.cgi?id=514580
Bug ID: 514580
Summary: ksystemstats_intel_helper crashes with SIGFPE
(division by zero) on Intel GPU
Classification: Plasma
Product: plasmashell
Version First master
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: generic-crash
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
Created attachment 188503
--> https://bugs.kde.org/attachment.cgi?id=188503&action=edit
Crash is caused by unguarded division in IntelHelper.cpp: engineCounters[...]
/ enginesPerClass[...] enginesPerClass[...] can be zero on some systems,
causing SIGFPE. A minimal patch is attached
SUMMARY
ksystemstats_intel_helper crashes with SIGFPE (division by zero) on Intel GPU
STEPS TO REPRODUCE
1. Use an Intel GPU where some engine classes report zero engines
2. Start Plasma or any component using ksystemstats (e.g. System Monitor
widgets)
3. ksystemstats_intel_helper crashes immediately
OBSERVED RESULT
ksystemstats_intel_helper crashes with SIGFPE due to division by zero.
As a result, GPU statistics stop working.
EXPECTED RESULT
ksystemstats_intel_helper should not crash when enginesPerClass[] is zero.
It should safely handle missing or unsupported engine classes.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.x
ADDITIONAL INFORMATION
Crash happens in ksystemstats_intel_helper (Plasma system statistics backend),
not in plasmashell UI itself.
Root cause:
Unconditional division by enginesPerClass[] without checking for zero.
A tested fix is to guard all divisions, e.g.:
engineCounters[class] / enginesPerClass[class]
→
enginesPerClass[class] ? (engineCounters[class] / enginesPerClass[class]) : 0
Patch tested locally, fully resolves the crash.
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