I get this backtrace 100% reproducible: #0 0x00007f87f15baa90 in raise () from /lib64/libc.so.6 #1 0x00007f87f15bc0f6 in abort () from /lib64/libc.so.6 #2 0x00007f87f05af41f in ?? () #3 0x00007f87f05ab4dd in wl_proxy_marshal_array_constructor_versioned () from /usr/lib64/libwayland-client.so.0 #4 0x00007f87f05ab5ec in wl_proxy_marshal () from /usr/lib64/libwayland-client.so.0 #5 0x00007f87e4714188 in QtWaylandClient::QWaylandWlShellSurface::updateTransientParent(QWindow*) () from /usr/lib64/libQt5WaylandClient.so.5 #6 0x00007f87e47124fb in QtWaylandClient::QWaylandWindow::initWindow() () from /usr/lib64/libQt5WaylandClient.so.5 #7 0x00007f87e4712b0d in QtWaylandClient::QWaylandWindow::setVisible(bool) () from /usr/lib64/libQt5WaylandClient.so.5 #8 0x00007f874fdf9cf4 in QtWaylandClient::QWaylandEglWindow::setVisible(bool) () from /usr/lib64/qt5/plugins/wayland-graphics-integration-client/libwayland-egl.so #9 0x00007f87f2790c9d in QWindow::setVisible(bool) () from /usr/lib64/libQt5Gui.so.5 #10 0x00007f87f7a5c0cd in PlasmaQuick::Dialog::setVisible (this=0x556ed82ce3c0, visible=<optimized out>) at /usr/src/debug/plasma-framework-5.36.0git.20170727T045342~8125fbcbf/src/plasmaquick/dialog.cpp:1369 #11 0x00007f87450f4d9f in ToolTip::showToolTip (this=0x556edc1c0ae0) at /usr/src/debug/plasma-framework-5.36.0git.20170727T045342~8125fbcbf/src/declarativeimports/core/tooltip.cpp:160 #12 0x00007f87f1f6035c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5 #13 0x00007f87f1f6c6a7 in QTimer::timeout(QTimer::QPrivateSignal) () from /usr/lib64/libQt5Core.so.5 #14 0x00007f87f1f6c9d8 in QTimer::timerEvent(QTimerEvent*) () from /usr/lib64/libQt5Core.so.5 #15 0x00007f87f1f60bfb in QObject::event(QEvent*) () from /usr/lib64/libQt5Core.so.5 #16 0x00007f87f2f4193c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5 #17 0x00007f87f2f48cb4 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5 #18 0x00007f87f1f32d48 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5 #19 0x00007f87f1f87c3e in QTimerInfoList::activateTimers() () from /usr/lib64/libQt5Core.so.5 #20 0x00007f87f1f88389 in ?? () from /usr/lib64/libQt5Core.so.5 #21 0x00007f87ec69eb67 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0 #22 0x00007f87ec69ed98 in ?? () from /usr/lib64/libglib-2.0.so.0 #23 0x00007f87ec69ee2c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0 #24 0x00007f87f1f8868f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5 #25 0x00007f87f1f3135a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5 #26 0x00007f87f1f39be4 in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5 #27 0x0000556ed356cd9b in ?? () #28 0x00007f87f15a646a in __libc_start_main () from /lib64/libc.so.6 #29 0x0000556ed356d11a in _start () This is printed on stderr: "error marshalling arguments for set_transient (signature oiiu): null value passed for arg 0" Not sure whether this is a bug in plasma-framework or Qt 5.9.1. Workaround: [PlasmaToolTips] Delay=0 in ~/.config/plasmarc
>Not sure whether this is a bug in plasma-framework or Qt 5.9.1. Bit of both. Spec says <arg name="parent" type="object" interface="wl_surface" summary="parent surface"/> It doesn't have: allow-null="true" Qt should check that and do nothing rather than make a protocol error. It implies Plasma is setting an invisible window as a transient parent which doesn't make sense either. But we'lll be switching to XdgV6 soon as not running this code anyway.
This bug is still 100% reproducible in Plasma 5.11. So I would suggest fixing this for pre-xdg-shell as well, as plasma is practically unusuable without this.
ok.
*** This bug has been marked as a duplicate of bug 381032 ***