Application: plasmashell (5.4.2)

Qt Version: 5.4.2
Operating System: Linux 4.2.0-23-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
- What I was doing when the application crashed:
I am sending mail with thunderbird. I alt+tab and do not release alt before thunderbird is finishing sending, and closes the mail window. 
- Unusual behavior I noticed:
All windows loses their control-line in the top. I cannot move or change windows. I cannot alt+tab. In the status line, the active windows pop up when I hover with the mouse, but I cannot activate them. If I close a window, it does not dissapear from the status line. I can start programs from the K-start-button.

I am not sure this is the correct crash added to the report. There is no crash information when it happens, but one shows up when I reboot. This is the one I am attaching.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f5a23047800 (LWP 1900))]

Thread 7 (Thread 0x7f5a0e544700 (LWP 1907)):
#0  0x00007f5a1d8028dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f5a21849bd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f5a2184b74f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f5a1088ea39 in QXcbEventReader::run (this=0x137a8b0) at qxcbconnection.cpp:1105
#4  0x00007f5a1def52be in QThreadPrivate::start (arg=0x137a8b0) at thread/qthread_unix.cpp:337
#5  0x00007f5a1cfe46aa in start_thread (arg=0x7f5a0e544700) at pthread_create.c:333
#6  0x00007f5a1d80deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f5a07dfa700 (LWP 1928)):
#0  0x00007f5a1d8028dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f5a1a5af1ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5a1a5af2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5a1e12c29b in QEventDispatcherGlib::processEvents (this=0x7f5a000008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f5a1e0d275a in QEventLoop::exec (this=this@entry=0x7f5a07df9da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f5a1def03d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f5a20718f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f5a1def52be in QThreadPrivate::start (arg=0x1447fc0) at thread/qthread_unix.cpp:337
#8  0x00007f5a1cfe46aa in start_thread (arg=0x7f5a07dfa700) at pthread_create.c:333
#9  0x00007f5a1d80deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f59fc85a700 (LWP 1960)):
#0  0x00007f5a1d8028dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f5a1a5af1ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5a1a5af2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5a1e12c29b in QEventDispatcherGlib::processEvents (this=0x7f59f80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f5a1e0d275a in QEventLoop::exec (this=this@entry=0x7f59fc859da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f5a1def03d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f5a20718f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f5a1def52be in QThreadPrivate::start (arg=0x1780770) at thread/qthread_unix.cpp:337
#8  0x00007f5a1cfe46aa in start_thread (arg=0x7f59fc85a700) at pthread_create.c:333
#9  0x00007f5a1d80deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f59f601d700 (LWP 1975)):
#0  0x00007f5a1a5f3869 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f5a1a5ae789 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5a1a5af11b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5a1a5af2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f5a1e12c29b in QEventDispatcherGlib::processEvents (this=0x7f59e80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f5a1e0d275a in QEventLoop::exec (this=this@entry=0x7f59f601cda0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f5a1def03d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f5a20718f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f5a1def52be in QThreadPrivate::start (arg=0x193c860) at thread/qthread_unix.cpp:337
#9  0x00007f5a1cfe46aa in start_thread (arg=0x7f59f601d700) at pthread_create.c:333
#10 0x00007f5a1d80deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f59effff700 (LWP 1984)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f5a22aa4114 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f5a22aa4159 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f5a1cfe46aa in start_thread (arg=0x7f59effff700) at pthread_create.c:333
#4  0x00007f5a1d80deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f5967b51700 (LWP 2228)):
#0  0x00007f5a1d8028dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f5a1a5af1ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5a1a5af2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5a1e12c29b in QEventDispatcherGlib::processEvents (this=0x7f59600008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f5a1e0d275a in QEventLoop::exec (this=this@entry=0x7f5967b50d50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f5a1def03d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f5a21094ef6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f5a1def52be in QThreadPrivate::start (arg=0x2a2c620) at thread/qthread_unix.cpp:337
#8  0x00007f5a1cfe46aa in start_thread (arg=0x7f5967b51700) at pthread_create.c:333
#9  0x00007f5a1d80deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f5a23047800 (LWP 1900)):
[KCrash Handler]
#6  0x00007f5a1d73c267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
#7  0x00007f5a1d73deca in __GI_abort () at abort.c:89
#8  0x00007f5a1db60b7d in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#9  0x00007f5a1db5e9c6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#10 0x00007f5a1db5ea11 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#11 0x00007f5a1db5f55f in __cxa_pure_virtual () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#12 0x00007f5a1e3e47ca in QPlatformScreen::physicalSize (this=<optimized out>) at kernel/qplatformscreen.cpp:131
#13 0x00007f5a1e41d212 in QScreen::physicalSize (this=this@entry=0x137b600) at kernel/qscreen.cpp:245
#14 0x00007f5a1e41d2c9 in QScreen::physicalDotsPerInch (this=0x137b600) at kernel/qscreen.cpp:168
#15 0x00007f5a2120cb6b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007f5a1e10578a in QMetaObject::activate (sender=sender@entry=0x15af040, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff3498c320) at kernel/qobject.cpp:3717
#17 0x00007f5a1e105f87 in QMetaObject::activate (sender=sender@entry=0x15af040, m=m@entry=0x7f5a1e835580 <QWindow::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff3498c320) at kernel/qobject.cpp:3582
#18 0x00007f5a1e3fadbf in QWindow::screenChanged (this=this@entry=0x15af040, _t1=_t1@entry=0x137d4e0) at .moc/moc_qwindow.cpp:626
#19 0x00007f5a1e3fbcb5 in QWindowPrivate::emitScreenChangedRecursion (this=this@entry=0x15df7c0, newScreen=newScreen@entry=0x137d4e0) at kernel/qwindow.cpp:366
#20 0x00007f5a1e3fecf3 in QWindowPrivate::setTopLevelScreen (this=0x15df7c0, newScreen=0x137d4e0, recreate=<optimized out>) at kernel/qwindow.cpp:387
#21 0x00007f5a1e3fee85 in QWindow::screenDestroyed (this=0x15af040, object=<optimized out>) at kernel/qwindow.cpp:1720
#22 0x00007f5a1e105617 in QtPrivate::QSlotObjectBase::call (a=0x7fff3498c570, r=0x15af040, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#23 QMetaObject::activate (sender=sender@entry=0x137b600, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff3498c570) at kernel/qobject.cpp:3702
#24 0x00007f5a1e105f87 in QMetaObject::activate (sender=sender@entry=0x137b600, m=m@entry=0x7f5a1e3020e0 <QObject::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff3498c570) at kernel/qobject.cpp:3582
#25 0x00007f5a1e10602f in QObject::destroyed (this=this@entry=0x137b600, _t1=_t1@entry=0x137b600) at .moc/moc_qobject.cpp:206
#26 0x00007f5a1e10d19a in QObject::~QObject (this=0x137b600, __in_chrg=<optimized out>) at kernel/qobject.cpp:903
#27 0x00007f5a1e41d0c9 in QScreen::~QScreen (this=0x137b600, __in_chrg=<optimized out>) at kernel/qscreen.cpp:77
#28 0x00007f5a1e3e4d49 in QPlatformScreen::~QPlatformScreen (this=0x137d520, __in_chrg=<optimized out>) at kernel/qplatformscreen.cpp:57
#29 0x00007f5a1089c519 in QXcbScreen::~QXcbScreen (this=0x137d520, __in_chrg=<optimized out>) at qxcbscreen.cpp:222
#30 0x00007f5a1088f909 in QXcbConnection::updateScreens (this=this@entry=0x136eaa0) at qxcbconnection.cpp:286
#31 0x00007f5a108905c6 in QXcbConnection::handleXcbEvent (this=this@entry=0x136eaa0, event=event@entry=0x7f5a08004f10) at qxcbconnection.cpp:961
#32 0x00007f5a108913b3 in QXcbConnection::processXcbEvents (this=0x136eaa0) at qxcbconnection.cpp:1303
#33 0x00007f5a1e106651 in QObject::event (this=0x136eaa0, e=<optimized out>) at kernel/qobject.cpp:1245
#34 0x00007f5a1ebb2b8c in QApplicationPrivate::notify_helper (this=this@entry=0x1363810, receiver=receiver@entry=0x136eaa0, e=e@entry=0x7f5a08003640) at kernel/qapplication.cpp:3720
#35 0x00007f5a1ebb8230 in QApplication::notify (this=0x7fff3498d0b0, receiver=0x136eaa0, e=0x7f5a08003640) at kernel/qapplication.cpp:3503
#36 0x00007f5a1e0d4f1b in QCoreApplication::notifyInternal (this=0x7fff3498d0b0, receiver=0x136eaa0, event=event@entry=0x7f5a08003640) at kernel/qcoreapplication.cpp:935
#37 0x00007f5a1e0d7057 in QCoreApplication::sendEvent (event=0x7f5a08003640, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#38 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1358d70) at kernel/qcoreapplication.cpp:1552
#39 0x00007f5a1e0d7588 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#40 0x00007f5a1e12be73 in postEventSourceDispatch (s=0x13a3440) at kernel/qeventdispatcher_glib.cpp:271
#41 0x00007f5a1a5aeff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007f5a1a5af250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007f5a1a5af2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007f5a1e12c27f in QEventDispatcherGlib::processEvents (this=0x1397b50, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#45 0x00007f5a1e0d275a in QEventLoop::exec (this=this@entry=0x7fff3498cf30, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#46 0x00007f5a1e0da2cc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#47 0x00007f5a1e3ef00c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#48 0x00007f5a1ebaf025 in QApplication::exec () at kernel/qapplication.cpp:2956
#49 0x00000000004322c3 in main (argc=2, argv=<optimized out>) at ../../shell/main.cpp:176

Possible duplicates by query: bug 355614, bug 355567, bug 354968, bug 354471, bug 350503.

Reported using DrKonqi