Bug 379612

Application: kwin_x11 (5.9.4)

Qt Version: 5.7.1
Frameworks Version: 5.31.0
Operating System: Linux 4.10.0-20-generic x86_64
Distribution: Ubuntu 17.04

-- Information about the crash:
- What I was doing when the application crashed:
I was logging in and nothing was there on screen but crash report appeared.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7ff141956580 (LWP 1807))]

Thread 5 (Thread 0x7ff1260cf700 (LWP 2261)):
#0  0x00007ff13aa8a510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff13ddb52c4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007ff13ddb5309 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007ff13aa846da in start_thread (arg=0x7ff1260cf700) at pthread_create.c:456
#4  0x00007ff14139017f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7ff11d14c700 (LWP 2068)):
[KCrash Handler]
#6  0x00007ff13eb8e1b4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff13eb2acb6 in QLockFile::tryLock(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff14070db19 in  () at /usr/lib/x86_64-linux-gnu/libKF5ConfigCore.so.5
#9  0x00007ff1406f77c0 in KConfig::sync() () at /usr/lib/x86_64-linux-gnu/libKF5ConfigCore.so.5
#10 0x00007ff11fddf665 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#11 0x00007ff13ec2781e in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007ff13ec33e38 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007ff13ec28313 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007ff13f8d335c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007ff13f8dab11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007ff13ebfb8a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007ff13ec4eeae in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007ff13ec4cdba in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007ff13ebf988a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007ff13ea26fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007ff13ea2bc98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007ff13aa846da in start_thread (arg=0x7ff11d14c700) at pthread_create.c:456
#23 0x00007ff14139017f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7ff11e14d700 (LWP 1994)):
#0  0x00007ff141384251 in __GI_ppoll (fds=0x7ff10c000ac8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ff13ec4b251 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff13ec4cb4a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff13ebf988a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff13ea26fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff1397f1df5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007ff13ea2bc98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff13aa846da in start_thread (arg=0x7ff11e14d700) at pthread_create.c:456
#8  0x00007ff14139017f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7ff127d24700 (LWP 1894)):
#0  0x00007ff14138418d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007ff136088576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff13608868c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff13ec4ff2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff13ebf988a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff13ea26fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff1389ca5c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007ff13ea2bc98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff13aa846da in start_thread (arg=0x7ff127d24700) at pthread_create.c:456
#9  0x00007ff14139017f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7ff141956580 (LWP 1807)):
#0  0x00007ff13aa8a510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff13ea2cb4b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff13ea25a23 in QSemaphore::acquire(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff13ec2771e in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff13ec27e6f in QObject::destroyed(QObject*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff13ec2eb05 in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff1390c2813 in  () at /usr/lib/x86_64-linux-gnu/libKF5GlobalAccel.so.5
#7  0x00007ff13ec25cd1 in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff13ec2f05f in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ff1390b3d99 in  () at /usr/lib/x86_64-linux-gnu/libKF5GlobalAccel.so.5
#10 0x00007ff1412c2270 in __run_exit_handlers (status=1, listp=0x7ff1416495d8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:83
#11 0x00007ff1412c22ca in __GI_exit (status=<optimized out>) at exit.c:105
#12 0x00007ff126d7f683 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#13 0x00007ff13ec28359 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007ff13f8d335c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007ff13f8dab11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007ff13ebfb8a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007ff13ebfe02d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007ff13ec4c977 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007ff126df69fd in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#20 0x00007ff13ebf988a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007ff13ec01ffc in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007ff141658112 in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#23 0x00007ff1412a83f1 in __libc_start_main (main=0x56020badc7e0, argc=3, argv=0x7ffed60aa108, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffed60aa0f8) at ../csu/libc-start.c:291
#24 0x000056020badc81a in _start ()

Reported using DrKonqi