https://bugs.kde.org/show_bug.cgi?id=412746
--- Comment #8 from Boudewijn Rempt <b...@valdyas.org> ---
It looks like there's mutex contention:
1 syscall
syscall.S 38 0x7fbc42164839
2 QtLinuxFutex::_q_futex
qfutex_p.h 92 0x7fbc42a85e55
3 QtLinuxFutex::futexWait<QBasicAtomicPointer<QMutexData>>
qfutex_p.h 107 0x7fbc42a85e55
4 lockInternal_helper<false>
qmutex_linux.cpp 142 0x7fbc42a85e55
5 QBasicMutex::lockInternal
qmutex_linux.cpp 159 0x7fbc42a85e55
6 QMutex::lock
qmutex.cpp 227 0x7fbc42a8603b
7 QMutexLocker::QMutexLocker
qmutex.h 206 0x7fbc400abdea
8 KoShapeManager::notifyShapeChanged(KoShape *) [clone .localalias.216]
KoShapeManager.cpp 691 0x7fbc400a6ad0
9 KoShape::notifyChanged()
KoShape.cpp 821 0x7fbc400954df
10 KoShape::setBackground
KoShape.cpp 1077 0x7fbc40098b97
11 KoShapeBackgroundCommand::redo()
atomic_base.h 295 0x7fbc401470b5
12 KUndo2Command::redoMergedCommands()
kundo2stack.cpp 398 0x7fbc3f628773
13 KUndo2QStack::push(KUndo2Command *)
kundo2stack.cpp 711 0x7fbc3f6294e8
14 KoFillConfigWidget::colorChanged()
KoFillConfigWidget.cpp 530 0x7fbc463d5870
15 KoFillConfigWidget::qt_static_metacall(QObject *, QMetaObject::Call, int,
void * *) moc_KoFillConfigWidget.cpp 149 0x7fbc4658d895
16 QMetaObject::activate
qobject.cpp 3809 0x7fbc42c9b8d5
17 QMetaObject::activate
qobject.cpp 3660 0x7fbc42c9bf97
18 KisSignalCompressor::timeout
moc_kis_signal_compressor.cpp 152 0x7fbc4440bf60
19 KisSignalCompressor::tryEmitSignalSafely
kis_signal_compressor.cpp 170 0x7fbc44400eb5
20 KisSignalCompressor::start
kis_signal_compressor.cpp 104 0x7fbc444010ba
... <More>
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