Bug 390100

Application: systemsettings5 (5.12.0)

Qt Version: 5.10.0
Frameworks Version: 5.42.0
Operating System: Linux 4.15.1-2-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed/Steps to reproduce:
Use Arch Linux
Use Plasma Wayland Session
Open system settings
Open fonts
Open font management -> immediately crashes

Could be related: I changed the Force fonts DPI setting to true (96) in this session.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f42af8a4800 (LWP 15482))]

Thread 4 (Thread 0x7f4286d17700 (LWP 15489)):
#0  0x00007f42ab27697b in poll () at /usr/lib/libc.so.6
#1  0x00007f42a4da2ff3 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f42a4da310e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f42abbc1d24 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f42abb63e9b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f42ab97378e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f42a949ea19 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f42ab978b2d in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f42a73f608c in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f42ab280e7f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f428ec4e700 (LWP 15485)):
#0  0x00007f42a4da251c in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#1  0x00007f42a4da2f1e in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f42a4da310e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f42abbc1d24 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f42abb63e9b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f42ab97378e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f42a949ea19 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f42ab978b2d in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f42a73f608c in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f42ab280e7f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f4299c35700 (LWP 15484)):
#0  0x00007f42ab27697b in poll () at /usr/lib/libc.so.6
#1  0x00007f42a4da2ff3 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f42a4da310e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f42abbc1d24 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f42abb63e9b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f42ab97378e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f42ad4e6416 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f42ab978b2d in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f42a73f608c in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f42ab280e7f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f42af8a4800 (LWP 15482)):
[KCrash Handler]
#5  0x00007f42aa2851d3 in XAddExtension () at /usr/lib/libX11.so.6
#6  0x00007f4274285a05 in  () at /usr/lib/libXft.so.2
#7  0x00007f4274285ede in XftDefaultHasRender () at /usr/lib/libXft.so.2
#8  0x00007f4274286410 in XftDefaultSubstitute () at /usr/lib/libXft.so.2
#9  0x00007f4274288d45 in XftFontMatch () at /usr/lib/libXft.so.2
#10 0x00007f4274288ed3 in XftFontOpen () at /usr/lib/libXft.so.2
#11 0x00007f42781a251a in KFI::CFcEngine::getFont(int) () at /usr/lib/libkfontinstui.so.5
#12 0x00007f42781a29e4 in KFI::CFcEngine::queryFont() () at /usr/lib/libkfontinstui.so.5
#13 0x00007f42781a3199 in KFI::CFcEngine::getSizes() () at /usr/lib/libkfontinstui.so.5
#14 0x00007f42781a4889 in KFI::CFcEngine::draw(QString const&, unsigned int, int, QColor const&, QColor const&, int, int, bool, QList<KFI::CFcEngine::TRange> const&, QList<KFI::CFcEngine::TChar>*) () at /usr/lib/libkfontinstui.so.5
#15 0x00007f427867f45a in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#16 0x00007f42786af607 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#17 0x00007f42786c573a in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#18 0x00007f42abb96076 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#19 0x00007f42786c3bb6 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#20 0x00007f42786a1013 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#21 0x00007f42786c4eb9 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#22 0x00007f42abb96076 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#23 0x00007f42abb0fd48 in QItemSelectionModel::selectionChanged(QItemSelection const&, QItemSelection const&) () at /usr/lib/libQt5Core.so.5
#24 0x00007f42abb14761 in QItemSelectionModel::emitSelectionChanged(QItemSelection const&, QItemSelection const&) () at /usr/lib/libQt5Core.so.5
#25 0x00007f42abb17a06 in QItemSelectionModel::select(QItemSelection const&, QFlags<QItemSelectionModel::SelectionFlag>) () at /usr/lib/libQt5Core.so.5
#26 0x00007f42abb11e0d in QItemSelectionModel::select(QModelIndex const&, QFlags<QItemSelectionModel::SelectionFlag>) () at /usr/lib/libQt5Core.so.5
#27 0x00007f427869a37d in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#28 0x00007f42786b34be in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#29 0x00007f42786c584c in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#30 0x00007f42abb96076 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#31 0x00007f42786c3a5f in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#32 0x00007f42786c4940 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#33 0x00007f42abb96076 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#34 0x00007f42786c6c38 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#35 0x00007f42786c90d6 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#36 0x00007f42ad4f1b5d in  () at /usr/lib/libQt5DBus.so.5
#37 0x00007f42abb96ac2 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#38 0x00007f42acb79ecc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#39 0x00007f42acb818a6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#40 0x00007f42abb65850 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#41 0x00007f42abb684b6 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#42 0x00007f42abbc2714 in  () at /usr/lib/libQt5Core.so.5
#43 0x00007f42a4da2e38 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#44 0x00007f42a4da3081 in  () at /usr/lib/libglib-2.0.so.0
#45 0x00007f42a4da310e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#46 0x00007f42abbc1d01 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#47 0x00007f429f1f5402 in  () at /usr/lib/libQt5WaylandClient.so.5
#48 0x00007f42abb63e9b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#49 0x00007f42abb6d188 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#50 0x0000558d433e9d30 in  ()
#51 0x00007f42ab1abf4a in __libc_start_main () at /usr/lib/libc.so.6
#52 0x0000558d433e9dba in _start ()

Reported using DrKonqi