https://bugs.kde.org/show_bug.cgi?id=449141
Bug ID: 449141
Summary: Polish loop in a ListView sometimes causes Kickoff to
hang
Product: plasmashell
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: Application Launcher (Kickoff)
Assignee: k...@davidedmundson.co.uk
Reporter: m...@ratijas.tk
CC: mikel5...@gmail.com, plasma-b...@kde.org
Target Milestone: 1.0
SUMMARY
The infamous QML problem — polishing loop may cause Kickoff to hang,
effectively DOS-ing the whole plasma shell.
I was typing in various queries in Kickoff's search, in fact I was looking for
an app that's not installed on my system, so that it would show a "Get
%appname%…" for Discover. So, at some point I scrolled all the way down through
the results list, haven't found a Discover link there, and quickly typed in a
new query: "gimp". Immediately after that Kickoff became unresponsive, nothing
reacted to mouse hover or clicks. Since I was running Plasmashell manually, I
switched to its terminal, saw the polishing loop errors, and killed the process
with Ctrl+C.
STEPS TO REPRODUCE
Not sure. Will post in comments if I can figure it out.
OBSERVED RESULT
file:///home/ratijas/kde/usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffListView.qml:68:18:
QML ListView: possible QQuickItem::polish() loop
file:///home/ratijas/kde/usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffListView.qml:68:18:
QML ListView: ListView called polish() inside updatePolish() of ListView
file:///home/ratijas/kde/usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffListView.qml:68:18:
QML ListView: possible QQuickItem::polish() loop
file:///home/ratijas/kde/usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffListView.qml:68:18:
QML ListView: ListView called polish() inside updatePolish() of ListView
file:///home/ratijas/kde/usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffListView.qml:68:18:
QML ListView: possible QQuickItem::polish() loop
file:///home/ratijas/kde/usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffListView.qml:68:18:
QML ListView: ListView called polish() inside updatePolish() of ListView
[...]
EXPECTED RESULT
Shan't. Shouldn't. Mustn't.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.24.80
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2
Kernel Version: 5.16.2-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 970M/PCIe/SSE2
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