Application: kwin_x11 (5.12.7)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.18.0-16-generic x86_64
Distribution: Ubuntu 18.04.2 LTS

-- Information about the crash:
- What I was doing when the application crashed: I tried saving sessions with Cantata, Discord, VMWare, VSCode, Steam opened.


- Unusual behavior I noticed: Applications bar below suddenly cleared and reopened running programs. Also, my app setting to appear in certain virtual desktop was cleared.


- Custom settings of the application: Restore sessions activated.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f7a1e2b9cc0 (LWP 28950))]

Thread 6 (Thread 0x7f79daf3a700 (LWP 28968)):
#0  0x00007f7a16c859f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f7a1a21cfb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7f7a1a21cf68, cond=0x7f7a1a21cf90) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7f7a1a21cf90, mutex=0x7f7a1a21cf68) at pthread_cond_wait.c:655
#3  0x00007f7a19f265f4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f7a19f26639 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f7a16c7f6db in start_thread (arg=0x7f79daf3a700) at pthread_create.c:463
#6  0x00007f7a1dc2688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f79e18b8700 (LWP 28966)):
#0  0x00007f7a16c859f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5581cadd8638) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x5581cadd85e8, cond=0x5581cadd8610) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x5581cadd8610, mutex=0x5581cadd85e8) at pthread_cond_wait.c:655
#3  0x00007f79e2415dcb in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007f79e2415af7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007f7a16c7f6db in start_thread (arg=0x7f79e18b8700) at pthread_create.c:463
#6  0x00007f7a1dc2688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f79f230b700 (LWP 28964)):
#0  0x00007f7a1dc19cf6 in __GI_ppoll (fds=0x7f79ec000d28, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f7a1b01b671 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f7a1b01cd8e in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f7a1afc4a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7a1ade323a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7a1576b6f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f7a1ade817d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7a16c7f6db in start_thread (arg=0x7f79f230b700) at pthread_create.c:463
#8  0x00007f7a1dc2688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f7a02508700 (LWP 28961)):
#0  0x00007f7a1dc19cf6 in __GI_ppoll (fds=0x7f79f4012508, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f7a1b01b671 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f7a1b01cd8e in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f7a1afc4a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7a1ade323a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7a14644d45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007f7a1ade817d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7a16c7f6db in start_thread (arg=0x7f7a02508700) at pthread_create.c:463
#8  0x00007f7a1dc2688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f7a046dc700 (LWP 28958)):
#0  0x00007f7a1dc19bf9 in __GI___poll (fds=0x7f7a046dbc68, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f7a1cb23747 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f7a1cb2536a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f7a055bb2a9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f7a1ade817d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7a16c7f6db in start_thread (arg=0x7f7a046dc700) at pthread_create.c:463
#6  0x00007f7a1dc2688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f7a1e2b9cc0 (LWP 28950)):
[KCrash Handler]
#6  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#7  0x00007f7a1db45801 in __GI_abort () at abort.c:79
#8  0x00007f7a1add2fb7 in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7a1d72849b in KWin::Workspace::windowTypeToTxt(NET::WindowType) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#10 0x00007f7a1d729b40 in KWin::Workspace::storeClient(KConfigGroup&, int, KWin::Client*) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007f7a1d72d2e8 in KWin::Workspace::storeSession(KConfig*, KWin::SMSavePhase) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007f7a1d72d53d in KWin::Workspace::saveState(QSessionManager&) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007f7a1aff577f in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f7a1b57e445 in QGuiApplication::saveStateRequest(QSessionManager&) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#15 0x00007f7a1b57ff9b in QGuiApplicationPrivate::saveState() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#16 0x00007f7a055ec0d8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#17 0x00007f7a18bfd39e in _SmcProcessMessage () from /usr/lib/x86_64-linux-gnu/libSM.so.6
#18 0x00007f7a18e11978 in IceProcessMessages () from /usr/lib/x86_64-linux-gnu/libICE.so.6
#19 0x00007f7a1aff5665 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f7a1b001ae8 in QSocketNotifier::activated(int, QSocketNotifier::QPrivateSignal) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f7a1b001eb2 in QSocketNotifier::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f7a1bd4483c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f7a1bd4c104 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f7a1afc69e8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f7a1b01ca38 in QEventDispatcherUNIXPrivate::activateSocketNotifiers() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f7a1b01d0b8 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f7a0561e5cd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#28 0x00007f7a1afc4a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007f7a1afcdac4 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007f7a1defedbb in kdemain () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#31 0x00007f7a1db26b97 in __libc_start_main (main=0x5581c9d86730, argc=3, argv=0x7ffd9e5153f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd9e5153e8) at ../csu/libc-start.c:310
#32 0x00005581c9d8676a in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 395712.

Possible duplicates by query: bug 404141, bug 403601, bug 403519, bug 403253, bug 401442.

Reported using DrKonqi