https://bugs.kde.org/show_bug.cgi?id=359580

--- Comment #4 from sq...@web.de ---
Created attachment 97824
  --> https://bugs.kde.org/attachment.cgi?id=97824&action=edit
CPU hogging plasmashell console output and geb backtrace

(In reply to Martin Klapetek from comment #2)
Luckily I'm still affected by the problem (immediately after starting KDE) on
two computers but not for every user.

> 1) Start plasmashell from Konsole and post the output when the CPU gets high
The output contains e.g.
Both point size and pixel size set. Using pixel size.
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:444:5:
QML Text: Cannot anchor to a null item.

Note:
A rpm query shows that this DigitalClock.qml is from the same package
plasma5-workspace-5.5.5.2-1.1.x86_64 as the plasmashell executable
The installed  plasma5-desktop is 5.5.5-1.1.x86_64 though.

> 2) Attach gdb to plasmashell process when the CPU usage gets high and post
> the backtrace
Statistical sampling with gdb shows that the plasmashell process is busy with 
#0  0x00007ff5e03c5a30 in  () at /usr/lib64/libQt5Qml.so.5
#1  0x00007ff5e03c6818 in  () at /usr/lib64/libQt5Qml.so.5
#2  0x00007ff5e03c67f4 in  () at /usr/lib64/libQt5Qml.so.5
#3  0x00007ff5e03c686c in QQmlIncubator::forceCompletion() () at
/usr/lib64/libQt5Qml.so.5
#4  0x00007ff5e1491f3e in KDeclarative::QmlObject::rootObject() const () at
/usr/lib64/libKF5Declarative.so.5
#5  0x00007ff5e2f0de3d in  () at /usr/lib64/libKF5PlasmaQuick.so.5
#6  0x00007ff5e1047599 in QQuickItem::setY(double) () at
/usr/lib64/libQt5Quick.so.5
#7  0x00007ff5e103fa74 in  () at /usr/lib64/libQt5Quick.so.5
#8  0x00007ff5e1042d2b in QQuickAnchors::qt_metacall(QMetaObject::Call, int,
void**) () at /usr/lib64/libQt5Quick.so.5
#9  0x00007ff5e03bda7f in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData
const&, QVariant const&, QQmlContextData*,
QFlags<QQmlPropertyPrivate::WriteFlag>) ()
    at /usr/lib64/libQt5Qml.so.5
#10 0x00007ff5e038547e in QV4::QObjectWrapper::setProperty(QObject*,
QV4::ExecutionContext*, QQmlPropertyData*, QV4::Value const&) () at
/usr/lib64/libQt5Qml.so.5
#11 0x00007ff5e0385a89 in
QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*,
QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&)
() at /usr/lib64/libQt5Qml.so.5
#12 0x00007ff5e0385bc1 in QV4::QObjectWrapper::put(QV4::Managed*, QV4::String*,
QV4::Value const&) () at /usr/lib64/libQt5Qml.so.5
#13 0x00007ff5e0394d62 in QV4::Runtime::setProperty(QV4::ExecutionEngine*,
QV4::Value const&, int, QV4::Value const&) () at /usr/lib64/libQt5Qml.so.5

Details attached.

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