https://bugs.kde.org/show_bug.cgi?id=399836
Bug ID: 399836 Summary: kwin crash on changing virtual desktop Product: kwin Version: 5.12.6 Platform: Ubuntu Packages OS: Linux Status: REPORTED Keywords: drkonqi Severity: crash Priority: NOR Component: general Assignee: kwin-bugs-n...@kde.org Reporter: stamatis.kavvad...@gmail.com Target Milestone: --- Application: kwin_x11 (5.12.6) Qt Version: 5.9.5 Frameworks Version: 5.44.0 Operating System: Linux 4.15.0-34-generic x86_64 Distribution: Ubuntu 18.04.1 LTS -- Information about the crash: Windows lose titlebar; I cannot change the focus with the mouse or with ALT-tab; the focused application is not responsive to the keyboard or the mouse; mouse is the only think moving; some lost titlebar usually allows mouse access to the desktop background and I can right-click and select Execute command... to run kwin --replace, which restores normal functionality. If I remember correctly, I can also go to a terminal, with CTRL-ALT-F1/F2 etc during the crash. Windows from all activities appear in a single activity, but retain their virtual desktop, on restore from the crash --I cannot say if this is also the case during the crash. - What I was doing when the application crashed: The crash happens repeatedly, when changing virtual desktop, using the keyboard shortcut (CTRL-ALT-left/right/up/down arrow). Usually, after I have been viewing idly a window for some time; more frequently when I was viewing idly for more than a minut, but it also happens after only 5-10 seconds sometimes. The crash can be reproduced sometimes. -- Backtrace: Application: KWin (kwin_x11), signal: Segmentation fault Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". [Current thread is 1 (Thread 0x7ff0a4aa7cc0 (LWP 9737))] Thread 3 (Thread 0x7fefb9f12700 (LWP 9749)): #0 0x00007ff09d4739f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7ff0a0a0afb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 #1 0x00007ff09d4739f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7ff0a0a0af68, cond=0x7ff0a0a0af90) at pthread_cond_wait.c:502 #2 0x00007ff09d4739f3 in __pthread_cond_wait (cond=0x7ff0a0a0af90, mutex=0x7ff0a0a0af68) at pthread_cond_wait.c:655 #3 0x00007ff0a07145f4 in () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5 #4 0x00007ff0a0714639 in () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5 #5 0x00007ff09d46d6db in start_thread (arg=0x7fefb9f12700) at pthread_create.c:463 #6 0x00007ff0a441388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 2 (Thread 0x7ff088847700 (LWP 9739)): #0 0x00007ffc4dd1ab62 in clock_gettime () #1 0x00007ff0a4422ea6 in __GI___clock_gettime (clock_id=1, tp=0x7ff088846b80) at ../sysdeps/unix/clock_gettime.c:115 #2 0x00007ff0a180c221 in () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #3 0x00007ff0a180aa59 in QTimerInfoList::updateCurrentTime() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #4 0x00007ff0a180b035 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #5 0x00007ff0a1809fe4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #6 0x00007ff0a17b19ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #7 0x00007ff0a15d022a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #8 0x00007ff09ae32d45 in () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5 #9 0x00007ff0a15d516d in () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #10 0x00007ff09d46d6db in start_thread (arg=0x7ff088847700) at pthread_create.c:463 #11 0x00007ff0a441388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 1 (Thread 0x7ff0a4aa7cc0 (LWP 9737)): [KCrash Handler] #6 0x00007ff0a3f9322d in KWin::Xcb::Extensions::init() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5 #7 0x00007ff0a3f93ad7 in KWin::Xcb::Extensions::self() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5 #8 0x00007ff0a3f03a8a in KWin::Application::updateX11Time(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5 #9 0x00007ff0a3f03b32 in () at /usr/lib/x86_64-linux-gnu/libkwin.so.5 #10 0x00007ff0a17b058f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #11 0x00007ff08c005820 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 #12 0x00007ff08c0064ac in QXcbConnection::processXcbEvents() () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 #13 0x00007ff0a17e3122 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #14 0x00007ff0a253182c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 #15 0x00007ff0a25390f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 #16 0x00007ff0a17b39a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #17 0x00007ff0a17b611d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #18 0x00007ff0a1809af4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #19 0x00007ff08c0675cd in () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 #20 0x00007ff0a17b19ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #21 0x00007ff0a17baa84 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #22 0x00007ff0a46ebdbb in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so #23 0x00007ff0a4313b97 in __libc_start_main (main=0x55a089d2b730, argc=2, argv=0x7ffc4dc50a18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc4dc50a08) at ../csu/libc-start.c:310 #24 0x000055a089d2b76a in _start () Possible duplicates by query: bug 352971. 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