Application: kwin_x11 (5.14.2)

Qt Version: 5.11.1
Frameworks Version: 5.51.0
Operating System: Linux 4.18.0-11-generic x86_64
Distribution: Ubuntu Disco Dingo (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
Switching to a virtual terminal while autologin is being performed. 
Frequency of occurance - Always

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 0x7fbcafa98840 (LWP 6706))]

Thread 6 (Thread 0x7fbc8fb3f700 (LWP 7147)):
#0  0x00007fbcb70752eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55d033003b48) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fbcb70752eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x55d033003af8, cond=0x55d033003b20) at pthread_cond_wait.c:502
#2  0x00007fbcb70752eb in __pthread_cond_wait (cond=0x55d033003b20, mutex=0x55d033003af8) at pthread_cond_wait.c:655
#3  0x00007fbbfb8f546b in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fbbfb8f51d7 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fbcb706f164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fbcb98aadef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fbc99dad700 (LWP 6716)):
#0  0x00007fbcb70752eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fbcb7e52fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fbcb70752eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fbcb7e52f68, cond=0x7fbcb7e52f90) at pthread_cond_wait.c:502
#2  0x00007fbcb70752eb in __pthread_cond_wait (cond=0x7fbcb7e52f90, mutex=0x7fbcb7e52f68) at pthread_cond_wait.c:655
#3  0x00007fbcb7d5be2a in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007fbcb7d5be49 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007fbcb706f164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fbcb98aadef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fbc9adee700 (LWP 6715)):
#0  0x00007fbcb989e7d6 in __GI_ppoll (fds=0x7fbc88000d28, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fbcb8462141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fbcb84635b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fbcb841316b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbcb82620b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbcb689f1f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fbcb826bc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbcb706f164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fbcb98aadef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fbca1401700 (LWP 6710)):
#0  0x00007fbcb989e7d6 in __GI_ppoll (fds=0x7fbc94012308, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fbcb8462141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fbcb84635b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fbcb841316b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbcb82620b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbcb6383545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007fbcb826bc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbcb706f164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fbcb98aadef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fbca21ec700 (LWP 6709)):
#0  0x00007fbcb989e6d9 in __GI___poll (fds=0x7fbca21ebc78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fbcb818b917 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fbcb818d53a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fbca26c3159 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fbcb826bc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbcb706f164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fbcb98aadef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fbcafa98840 (LWP 6706)):
[KCrash Handler]
#6  0x00007fbcb95d51d2 in KWin::Workspace::clientArea(KWin::clientAreaOption, int, int) const () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#7  0x00007fbcb95bfc8c in KWin::Client::manage(unsigned int, bool) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#8  0x00007fbcb9531997 in KWin::Workspace::createClient(unsigned int, bool) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#9  0x00007fbcb95abb48 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#10 0x00007fbcb8411fef in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fbca26c48f0 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#12 0x00007fbca26c54b3 in QXcbConnection::processXcbEvents() () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#13 0x00007fbcb843df92 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fbcb8dd54a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007fbcb8ddcae0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007fbcb8414499 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fbcb841748b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007fbcb846342b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fbca27550ed in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#20 0x00007fbcb841316b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fbcb841b2e2 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fbcb998447b in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#23 0x00007fbcb97b409b in __libc_start_main (main=0x55d030edc050, argc=3, argv=0x7ffc2cae6138, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc2cae6128) at ../csu/libc-start.c:308
#24 0x000055d030edc08a in _start ()
[Inferior 1 (process 6706) detached]

Possible duplicates by query: bug 390247.

Reported using DrKonqi