This results in plasmashell/plasmaenginexplorer to freeze

#0  0x00007ffff330418d in poll () from /usr/lib/libc.so.6
#1  0x00007fffeeb157bf in ?? () from /usr/lib/libdbus-1.so.3
#2  0x00007fffeeb1442e in ?? () from /usr/lib/libdbus-1.so.3
#3  0x00007fffeeafd094 in ?? () from /usr/lib/libdbus-1.so.3
#4  0x00007fffeeafda6d in ?? () from /usr/lib/libdbus-1.so.3
#5  0x00007fffeeafe04a in dbus_connection_send_with_reply_and_block () from /usr/lib/libdbus-1.so.3
#6  0x00007fffeeaf9e28 in dbus_bus_register () from /usr/lib/libdbus-1.so.3
#7  0x00007fffeeafa08f in ?? () from /usr/lib/libdbus-1.so.3
#8  0x00007ffff592b905 in QDBusConnection::connectToBus(QDBusConnection::BusType, QString const&) () from /usr/lib/libQt5DBus.so.5
#9  0x00007ffff592bafc in QDBusConnection::systemBus() () from /usr/lib/libQt5DBus.so.5
#10 0x00007fffe07fb378 in Solid::Backends::UDisks2::Manager::Manager (this=0x9a07c0, parent=0x0) at /home/bshah/kdesrc/frameworks/solid/src/solid/devices/backends/udisks2/udisksmanager.cpp:37
#11 0x00007fffe07c4368 in Solid::ManagerBasePrivate::loadBackends (this=0x99f830) at /home/bshah/kdesrc/frameworks/solid/src/solid/devices/managerbase.cpp:79
#12 0x00007fffe07cba71 in Solid::DeviceManagerPrivate::DeviceManagerPrivate (this=0x99f820) at /home/bshah/kdesrc/frameworks/solid/src/solid/devices/frontend/devicemanager.cpp:38
#13 0x00007fffe07ccefb in Solid::DeviceManagerStorage::ensureManagerCreated (this=0x7fffe0a71bf4 <(anonymous namespace)::Q_QGS_globalDeviceStorage::innerFunction()::holder>)
    at /home/bshah/kdesrc/frameworks/solid/src/solid/devices/frontend/devicemanager.cpp:294
#14 0x00007fffe07cceb4 in Solid::DeviceManagerStorage::notifier (this=0x7fffe0a71bf4 <(anonymous namespace)::Q_QGS_globalDeviceStorage::innerFunction()::holder>)
    at /home/bshah/kdesrc/frameworks/solid/src/solid/devices/frontend/devicemanager.cpp:287
#15 0x00007fffe07cc8a4 in Solid::DeviceNotifier::instance () at /home/bshah/kdesrc/frameworks/solid/src/solid/devices/frontend/devicemanager.cpp:175
#16 0x00007fffd850f095 in PowermanagementEngine::init (this=0x99c7b0) at /home/bshah/kdesrc/kde/workspace/plasma-workspace/dataengines/powermanagement/powermanagementengine.cpp:67
#17 0x00007fffd850ef1d in PowermanagementEngine::PowermanagementEngine (this=0x99c7b0, parent=0x0, args=...)
    at /home/bshah/kdesrc/kde/workspace/plasma-workspace/dataengines/powermanagement/powermanagementengine.cpp:59
#18 0x00007fffd85257f1 in KPluginFactory::createInstance<PowermanagementEngine, QObject> (parentWidget=0x0, parent=0x0, args=...) at /opt/kde/include/KF5/KCoreAddons/kpluginfactory.h:477
#19 0x00007ffff5bd728c in KPluginFactory::create (this=0x99c5b0, iface=0x7ffff7b9cd08 <qt_meta_stringdata_Plasma__DataEngine+552> "Plasma::DataEngine", parentWidget=0x0, parent=0x0, args=..., 
    keyword=...) at /home/bshah/kdesrc/frameworks/kcoreaddons/src/lib/plugin/kpluginfactory.cpp:145
#20 0x00007ffff7b1eedc in KPluginFactory::create<Plasma::DataEngine> (this=0x99c5b0, parent=0x0, args=...) at /opt/kde/include/KF5/KCoreAddons/kpluginfactory.h:495
#21 0x00007ffff7b15423 in Plasma::PluginLoader::loadDataEngine (this=0x77d250, name=...) at /home/bshah/kdesrc/frameworks/plasma-framework/src/plasma/pluginloader.cpp:293
#22 0x00000000004226d8 in EngineExplorer::showEngine (this=0x6d2190, name=...) at /home/bshah/kdesrc/kde/workspace/plasma-sdk/engineexplorer/engineexplorer.cpp:198
#23 0x000000000043ba0e in EngineExplorer::qt_static_metacall (_o=0x6d2190, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fffffffd010)
    at /home/bshah/kdesrc/build/kde/workspace/plasma-sdk/engineexplorer/moc_engineexplorer.cpp:100
#24 0x00007ffff412912a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#25 0x00007ffff4f43485 in QComboBox::activated(QString const&) () from /usr/lib/libQt5Widgets.so.5
#26 0x00007ffff4f458a6 in ?? () from /usr/lib/libQt5Widgets.so.5
#27 0x00007ffff4f48149 in ?? () from /usr/lib/libQt5Widgets.so.5
#28 0x00007ffff4f4d7ed in ?? () from /usr/lib/libQt5Widgets.so.5
#29 0x00007ffff412912a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#30 0x00007ffff51cc912 in ?? () from /usr/lib/libQt5Widgets.so.5
#31 0x00007ffff4f43e18 in ?? () from /usr/lib/libQt5Widgets.so.5
#32 0x00007ffff40fa79c in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#33 0x00007ffff4e30ffc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#34 0x00007ffff4e380e3 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#35 0x00007ffff40fa9ab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#36 0x00007ffff4682594 in QShortcutMap::tryShortcutEvent(QObject*, QKeyEvent*) () from /usr/lib/libQt5Gui.so.5
#37 0x00007ffff4656cba in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) () from /usr/lib/libQt5Gui.so.5
#38 0x00007ffff465bdc5 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#39 0x00007ffff4641208 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#40 0x00007fffe2f533c0 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#41 0x00007fffee5d1dc7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#42 0x00007fffee5d2020 in ?? () from /usr/lib/libglib-2.0.so.0
#43 0x00007fffee5d20cc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#44 0x00007ffff415134f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#45 0x00007ffff40f837a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#46 0x00007ffff410033c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#47 0x0000000000436608 in main (argc=1, argv=0x7fffffffddf8) at /home/bshah/kdesrc/kde/workspace/plasma-sdk/engineexplorer/main.cpp:141

Reproducible: Always