https://bugs.kde.org/show_bug.cgi?id=374853
Bug ID: 374853
Summary: kwin hangs on an attempt to trigger Show Desktop Grid
effect
Product: kwin
Version: 5.8.5
Platform: Kubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: effects-desktop-grid
Assignee: kwin-bugs-n...@kde.org
Reporter: dima...@gmail.com
Target Milestone: ---
kwin (and all desktop UI) had hanged just after I pressed Ctrl+F8 (Show Desktop
Grid). It was eating 100% of CPU. The bug is not reproduced very often. I have
encountered the bug just once, so far.
perf top says this function
Children Self Shared Object Symbol
29.20% 25.51% libQt5Core.so.5.6.1 [.]
_ZNK11QMetaObject15indexOfPropertyEPKc
eats 100% of CPU
Here is backtrace (obtained with attached gdb):
info threads
Id Target Id Frame
* 1 Thread 0x7fb5d1e16940 (LWP 3310) "kwin_x11" 0x00007fb5e6316a2b in
QMetaObject::indexOfProperty(char const*) const ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
2 Thread 0x7fb5d1e12700 (LWP 3328) "QDBusConnection" 0x00007fb5e84fb0bd in
poll () at ../sysdeps/unix/syscall-template.S:84
3 Thread 0x7fb5cbfff700 (LWP 3346) "QXcbEventReader" 0x00007fb5e84fb0bd in
poll () at ../sysdeps/unix/syscall-template.S:84
4 Thread 0x7fb5c890e700 (LWP 3551) "QQmlThread" 0x00007fb5e84fcea3 in
select () at ../sysdeps/unix/syscall-template.S:84
5 Thread 0x7fb5b9459700 (LWP 3566) "kwin_x11"
pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
6 Thread 0x7fb5b9c5a700 (LWP 6119) "QQmlThread" 0x00007fb5e84fcea3 in
select () at ../sysdeps/unix/syscall-template.S:84
backtrace
#0 0x00007fb5e6316a2b in QMetaObject::indexOfProperty(char const*) const ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1 0x00007fb5e633963b in QObject::property(char const*) const () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2 0x00007fb5e5adefc2 in KWin::EffectWindow::height() const () from
/usr/lib/x86_64-linux-gnu/libkwineffects.so.9
#3 0x00007fb5e563d575 in ?? () from
/usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#4 0x00007fb5e563e819 in ?? () from
/usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#5 0x00007fb5e5643dc1 in ?? () from
/usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#6 0x00007fb5e561ac18 in ?? () from
/usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#7 0x00007fb5e633ab49 in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8 0x00007fb5e5af0327 in
KWin::EffectsHandler::windowGeometryShapeChanged(KWin::EffectWindow*, QRect
const&) () from /usr/lib/x86_64-linux-gnu/libkwineffects.so.9
#9 0x00007fb5e633abec in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fb5e814af47 in KWin::Toplevel::geometryShapeChanged(KWin::Toplevel*,
QRect const&) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007fb5e802dabb in ?? () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007fb5e802dc6b in ?? () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007fb5e80313f3 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*)
() from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#14 0x00007fb5e630a23f in
QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007fb5d1105c75 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*)
() from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#16 0x00007fb5d1106c0b in QXcbConnection::processXcbEvents() () from
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#17 0x00007fb5e633b699 in QObject::event(QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007fb5e6c488ac in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007fb5e6c4dd4f in QApplication::notify(QObject*, QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007fb5e630d3b0 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fb5e630f33c in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fb5e6360b52 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007fb5d117e94d in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#24 0x00007fb5e630b0fa in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007fb5e631390c in QCoreApplication::exec() () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fb5e87cf206 in kdemain () from
/usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#27 0x00007fb5e841f3f1 in __libc_start_main (main=0x55733fba17e0, argc=3,
argv=0x7ffe63edc418, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>,
stack_end=0x7ffe63edc408) at ../csu/libc-start.c:291
#28 0x000055733fba181a in _start ()
Detaching from program: /usr/bin/kwin_x11, process 3310
Perhaps it is somehow related to https://bugs.kde.org/show_bug.cgi?id=374607
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