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 -- You are receiving this mail because: You are watching all bug changes.