Bug 402174 - System settings crash upon clicking application style
Summary: System settings crash upon clicking application style
Status: RESOLVED DOWNSTREAM
Alias: None
Product: systemsettings
Classification: Applications
Component: general (show other bugs)
Version: 5.14.4
Platform: Arch Linux Linux
: NOR crash
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords: drkonqi
Depends on:
Blocks:
 
Reported: 2018-12-15 22:56 UTC by software
Modified: 2018-12-21 01:01 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

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Description software 2018-12-15 22:56:44 UTC 
Application: systemsettings5 (5.14.4)

Qt Version: 5.11.2
Frameworks Version: 5.52.0
Operating System: Linux 4.19.4-arch1-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
executed yay -S kde-gtk config breeze-gtk
went into system settings, searched for GTK and clicked on the first "application style"
- Unusual behavior I noticed:
before that I would often get a warning for a missing gtk theme.
The application style icon seems a bit odd (plain white looking folder)

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 0x7f9454e91cc0 (LWP 15176))]

Thread 28 (Thread 0x7f93d77fe700 (LWP 15206)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 27 (Thread 0x7f93d7fff700 (LWP 15205)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 26 (Thread 0x7f93fd73f700 (LWP 15204)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 25 (Thread 0x7f93fdf40700 (LWP 15203)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 24 (Thread 0x7f93feffd700 (LWP 15202)):
#0  0x00007f945a6fec21 in poll () at /usr/lib/libc.so.6
#1  0x00007f94582bdee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f94582bdfce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f945ac25fe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f945abd18cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f945aa1aeb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f9459e20859 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f945aa24f65 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 23 (Thread 0x7f94057fa700 (LWP 15199)):
#0  0x00007f945a6fec21 in poll () at /usr/lib/libc.so.6
#1  0x00007f94582bdee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f94582bdfce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f945ac25fe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f945abd18cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f945aa1aeb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f9459e20859 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f945aa24f65 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 22 (Thread 0x7f9405ffb700 (LWP 15197)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 21 (Thread 0x7f94067fc700 (LWP 15196)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 20 (Thread 0x7f9406ffd700 (LWP 15195)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 19 (Thread 0x7f94077fe700 (LWP 15194)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 18 (Thread 0x7f93ff7fe700 (LWP 15193)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 17 (Thread 0x7f9407fff700 (LWP 15192)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 16 (Thread 0x7f9428ff9700 (LWP 15191)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7f94297fa700 (LWP 15190)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7f9429ffb700 (LWP 15189)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7f942a7fc700 (LWP 15188)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7f942affd700 (LWP 15187)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f942b7fe700 (LWP 15186)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f942bfff700 (LWP 15185)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f9448a6b700 (LWP 15184)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f944926c700 (LWP 15183)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f9449a6d700 (LWP 15182)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f944a26e700 (LWP 15181)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f944aa6f700 (LWP 15180)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f944b270700 (LWP 15179)):
#0  0x00007f9458fb7afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f944b9cdcdc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f944b9cda18 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f9451f8b700 (LWP 15178)):
#0  0x00007f945a6fec21 in poll () at /usr/lib/libc.so.6
#1  0x00007f94582bdee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f94582bdfce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f945ac25fe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f945abd18cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f945aa1aeb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f945ae77ba6 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f945aa24f65 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f9453cbc700 (LWP 15177)):
#0  0x00007f945a6fec21 in poll () at /usr/lib/libc.so.6
#1  0x00007f9458f72630 in  () at /usr/lib/libxcb.so.1
#2  0x00007f9458f742db in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f9454a3ac5a in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f945aa24f65 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f9458fb1a9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f945a709b23 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f9454e91cc0 (LWP 15176)):
[KCrash Handler]
#6  0x00000000000040f0 in  ()
#7  0x00007f945c19954a in call_init.part () at /lib64/ld-linux-x86-64.so.2
#8  0x00007f945c19964a in _dl_init () at /lib64/ld-linux-x86-64.so.2
#9  0x00007f945c19d533 in dl_open_worker () at /lib64/ld-linux-x86-64.so.2
#10 0x00007f945a745f57 in _dl_catch_exception () at /usr/lib/libc.so.6
#11 0x00007f945c19cdff in _dl_open () at /lib64/ld-linux-x86-64.so.2
#12 0x00007f945837515a in  () at /usr/lib/libdl.so.2
#13 0x00007f945a745f57 in _dl_catch_exception () at /usr/lib/libc.so.6
#14 0x00007f945a745ff3 in _dl_catch_error () at /usr/lib/libc.so.6
#15 0x00007f94583758bf in  () at /usr/lib/libdl.so.2
#16 0x00007f94583751fa in dlopen () at /usr/lib/libdl.so.2
#17 0x00007f945abcf56e in  () at /usr/lib/libQt5Core.so.5
#18 0x00007f945abc91b6 in  () at /usr/lib/libQt5Core.so.5
#19 0x00007f945abc9781 in  () at /usr/lib/libQt5Core.so.5
#20 0x00007f945bbd12bb in KPluginLoader::load() () at /usr/lib/libKF5CoreAddons.so.5
#21 0x00007f945bbd13bb in KPluginLoader::instance() () at /usr/lib/libKF5CoreAddons.so.5
#22 0x00007f945bbd1408 in KPluginLoader::factory() () at /usr/lib/libKF5CoreAddons.so.5
#23 0x00007f945c0ff763 in KCModuleLoader::loadModule(KCModuleInfo const&, KCModuleLoader::ErrorReporting, QWidget*, QStringList const&) () at /usr/lib/libKF5KCMUtils.so.5
#24 0x00007f945c10777f in  () at /usr/lib/libKF5KCMUtils.so.5
#25 0x00007f945c107dfb in KCModuleProxy::realModule() const () at /usr/lib/libKF5KCMUtils.so.5
#26 0x00007f945c147cd9 in ModuleView::stateChanged() () at /usr/lib/libsystemsettingsview.so.3
#27 0x00007f945c147f21 in ModuleView::activeModuleChanged(KPageWidgetItem*, KPageWidgetItem*) () at /usr/lib/libsystemsettingsview.so.3
#28 0x00007f945abfca7c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#29 0x00007f945be40ffc in KPageWidget::currentPageChanged(KPageWidgetItem*, KPageWidgetItem*) () at /usr/lib/libKF5WidgetsAddons.so.5
#30 0x00007f945be411b8 in  () at /usr/lib/libKF5WidgetsAddons.so.5
#31 0x00007f945abfca7c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#32 0x00007f945be3b608 in KPageView::currentPageChanged(QModelIndex const&, QModelIndex const&) () at /usr/lib/libKF5WidgetsAddons.so.5
#33 0x00007f945be3ca36 in  () at /usr/lib/libKF5WidgetsAddons.so.5
#34 0x00007f945abfca7c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#35 0x00007f945ab93859 in QItemSelectionModel::selectionChanged(QItemSelection const&, QItemSelection const&) () at /usr/lib/libQt5Core.so.5
#36 0x00007f945ab9951e in QItemSelectionModel::emitSelectionChanged(QItemSelection const&, QItemSelection const&) () at /usr/lib/libQt5Core.so.5
#37 0x00007f945ab9ca86 in QItemSelectionModel::select(QItemSelection const&, QFlags<QItemSelectionModel::SelectionFlag>) () at /usr/lib/libQt5Core.so.5
#38 0x00007f945ab963fd in QItemSelectionModel::select(QModelIndex const&, QFlags<QItemSelectionModel::SelectionFlag>) () at /usr/lib/libQt5Core.so.5
#39 0x00007f945ab93c3d in QItemSelectionModel::setCurrentIndex(QModelIndex const&, QFlags<QItemSelectionModel::SelectionFlag>) () at /usr/lib/libQt5Core.so.5
#40 0x00007f945be3bab0 in  () at /usr/lib/libKF5WidgetsAddons.so.5
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[Inferior 1 (process 15176) detached]

Reported using DrKonqi
Comment 1 Alexander M. 2018-12-17 10:45:54 UTC 
I don't know if it's the same bug I came here to report, but it seems similar enough.

I've been having kde-gtk-config crash on me since at least a couple of major releases ago (i.e. 5.12 or so) whenever I click on "Gnome Application Style" in the system settings. It also produces the following errors before it crashes:

couldn't include  "widgets/default"
couldn't include  "widgets/buttons"
couldn't include  "widgets/menu"
couldn't include  "widgets/entry"
couldn't include  "widgets/notebook"
couldn't include  "widgets/range"
couldn't include  "widgets/scrollbar"
couldn't include  "widgets/toolbar"
couldn't include  "widgets/progressbar"
couldn't include  "widgets/misc"
couldn't include  "widgets/styles"

(These errors are specific to Breeze, other themes produce different but similar errors, for reasons that will hopefully become apparent.)


At first I found a hacky solution was to delete the file ~/.gtkrc-2.0 that is created/populated by kde-gtk-config, but this would of course reset my GTK theme settings. But, since afterwards I could simply tweak my theme options, save them and then never bother with kde-gtk-config again, it proved adequate.

Yesterday I looked into it a bit more, and I found that the culprit seems to be that kde-gtk-config includes the following two lines in ~/.gtkrc-2.0:

include "/usr/share/themes/$SELECTED_THEME/gtk-2.0/gtkrc"
include "/etc/gtk-2.0/gtkrc"

I looked it up on the internet and found this, back from 2010:

https://www.linuxquestions.org/questions/slackware-14/latest-current-updates-gtkrc-2-0-doesn%27t-appear-to-work-844356/

In short, at some point in time, the "gtk-theme-name" property seems to have stopped working properly, and in order to set a GTK theme one had to also manually include its configuration files. Now, it seems that as of late this is no longer the case, in fact having those includes produces a crash.

So I tested it and indeed, commenting out or deleting those two lines results in kde-gtk-config no longer crashing and what's more, the GTK theme is applied correctly - which seems to imply that "gtk-theme-name" works once again as it should, making those problematic includes redundant.

So, to sum up, OP:

Does deleting the file ~/.gtkrc-2.0, or commenting out/deleting those two lines in it, resolve your issue?
Comment 2 Christoph Feck 2018-12-20 18:54:02 UTC 
Crash is caused by dlopen library loader error, possibly because of a broken ldconfig setup. If this is reproducible with all packages updated from consistent repositories, please report this issue directly to the bug tracker of your distribution.
Comment 3 Alexander M. 2018-12-21 01:01:17 UTC 
In my case, I found out that the issues were caused by a rogue /etc/gtk-2.0/gtkrc link pointing to ~/.gtkrc, which includes /etc/gtk-2.0/gtkrc, which means it ended up including itself again and again in an infinite loop, which is what caused the crash. I'm 100% certain I've never created that link, so it's probably the result of some change between Plasma 5.12 and 5.13 (either upstream or downstream, by the Arch maintainers).

In any case, deleting that link fixes the problem. Don't know if this is relevant to this bug after all, though. At the very least, since everything else works properly and I'm on an Arch system similar to the OP's, I can confirm that the issue is *NOT* "reproducible with all packages updated from consistent repositories".