Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-45-generic x86_64
Distribution: Ubuntu 16.04.1 LTS

-- Information about the crash:
This is seen frequently, but not always, when using the mouse to move between open tasks on the taskbar.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f21a960b8c0 (LWP 792))]

Thread 10 (Thread 0x7f20e1a42700 (LWP 895)):
#0  0x00007f21a3d13e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f21a0aa939c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f21a0aa94ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f21a4640a9b in QEventDispatcherGlib::processEvents (this=0x7f20dc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f21a45e7dea in QEventLoop::exec (this=this@entry=0x7f20e1a41cc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f21a44048a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f20e3f207d7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f21a440984e in QThreadPrivate::start (arg=0x2c08f90) at thread/qthread_unix.cpp:331
#8  0x00007f21a34f66fa in start_thread (arg=0x7f20e1a42700) at pthread_create.c:333
#9  0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f20effff700 (LWP 822)):
#0  0x00007f21a0aedae4 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f21a0aa8dc9 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f21a0aa9340 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f21a0aa94ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f21a4640a9b in QEventDispatcherGlib::processEvents (this=0x7f20e80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f21a45e7dea in QEventLoop::exec (this=this@entry=0x7f20efffec90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f21a44048a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f21a7632ed6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f21a440984e in QThreadPrivate::start (arg=0x1d2cfe0) at thread/qthread_unix.cpp:331
#9  0x00007f21a34f66fa in start_thread (arg=0x7f20effff700) at pthread_create.c:333
#10 0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f2176df6700 (LWP 821)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f21a9051bd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f21a9051c19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f21a34f66fa in start_thread (arg=0x7f2176df6700) at pthread_create.c:333
#4  0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f2177fff700 (LWP 820)):
#0  0x00007f21a3d13e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f21a0aa939c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f21a0aa94ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f21a4640a9b in QEventDispatcherGlib::processEvents (this=0x7f21700008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f21a45e7dea in QEventLoop::exec (this=this@entry=0x7f2177ffece0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f21a44048a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f21a6cac3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f21a440984e in QThreadPrivate::start (arg=0x1b07060) at thread/qthread_unix.cpp:331
#8  0x00007f21a34f66fa in start_thread (arg=0x7f2177fff700) at pthread_create.c:333
#9  0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f217e571700 (LWP 819)):
#0  __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:65
#1  0x00007f21a3d13e82 in poll () at ../sysdeps/unix/syscall-template.S:84
#2  0x00007f21a0aa939c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f21a0aa94ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f21a4640a9b in QEventDispatcherGlib::processEvents (this=0x7f21780008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f21a45e7dea in QEventLoop::exec (this=this@entry=0x7f217e570ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f21a44048a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f21a6cac3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f21a440984e in QThreadPrivate::start (arg=0x1a0f060) at thread/qthread_unix.cpp:331
#9  0x00007f21a34f66fa in start_thread (arg=0x7f217e571700) at pthread_create.c:333
#10 0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f2189931700 (LWP 818)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f218b673aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f218b673907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f21a34f66fa in start_thread (arg=0x7f2189931700) at pthread_create.c:333
#4  0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f218a132700 (LWP 817)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f218b673aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f218b673907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f21a34f66fa in start_thread (arg=0x7f218a132700) at pthread_create.c:333
#4  0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f2192141700 (LWP 797)):
#0  0x00007f21a4401dcf in QBasicAtomicOps<8>::testAndSetRelaxed<QMutexData*> (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=0x1, _q_value=@0x17a7968: 0x0) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86.h:259
#1  QGenericAtomicOps<QBasicAtomicOps<8> >::testAndSetRelease<QMutexData*, QMutexData*> (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=<optimized out>, _q_value=@0x17a7968: 0x0) at ../../include/QtCore/../../src/corelib/thread/qgenericatomic.h:175
#2  QBasicAtomicPointer<QMutexData>::testAndSetRelease (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=<optimized out>, this=this@entry=0x17a7968) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:278
#3  QBasicMutex::fastTryUnlock (current=<synthetic pointer>, this=this@entry=0x17a7968) at thread/qmutex.h:85
#4  QMutex::unlock (this=this@entry=0x17a7968) at thread/qmutex.cpp:264
#5  0x00007f21a4640305 in QMutexLocker::unlock (this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:138
#6  QMutexLocker::~QMutexLocker (this=<synthetic pointer>, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:132
#7  QThreadData::canWaitLocked (this=<optimized out>) at ../../include/QtCore/5.5.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:240
#8  postEventSourcePrepare (timeout=<synthetic pointer>, s=0x7f21840012d0) at kernel/qeventdispatcher_glib.cpp:254
#9  postEventSourceCheck (source=0x7f21840012d0) at kernel/qeventdispatcher_glib.cpp:264
#10 0x00007f21a0aa8dd1 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f21a0aa9340 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f21a0aa94ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007f21a4640a9b in QEventDispatcherGlib::processEvents (this=0x7f21840008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#14 0x00007f21a45e7dea in QEventLoop::exec (this=this@entry=0x7f2192140ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#15 0x00007f21a44048a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#16 0x00007f21a6cac3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#17 0x00007f21a440984e in QThreadPrivate::start (arg=0x179b320) at thread/qthread_unix.cpp:331
#18 0x00007f21a34f66fa in start_thread (arg=0x7f2192141700) at pthread_create.c:333
#19 0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f219494f700 (LWP 796)):
#0  0x00007f21a3d13e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f21a7dd8c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f21a7dda8d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f2196a9d629 in QXcbEventReader::run (this=0x16dc6a0) at qxcbconnection.cpp:1253
#4  0x00007f21a440984e in QThreadPrivate::start (arg=0x16dc6a0) at thread/qthread_unix.cpp:331
#5  0x00007f21a34f66fa in start_thread (arg=0x7f219494f700) at pthread_create.c:333
#6  0x00007f21a3d1fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f21a960b8c0 (LWP 792)):
[KCrash Handler]
#6  __memmove_ssse3_back () at ../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:1574
#7  0x00007f218b3034ad in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#8  0x00007f218b301d95 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#9  0x00007f2190e45c1f in Plasma::WindowThumbnail::bindGLXTexture (this=this@entry=0x31d0c10) at /build/plasma-framework-ZIMEEb/plasma-framework-5.18.0/src/declarativeimports/core/windowthumbnail.cpp:447
#10 0x00007f2190e46e44 in Plasma::WindowThumbnail::windowToTextureGLX (this=this@entry=0x31d0c10, textureNode=textureNode@entry=0x32ac8d0) at /build/plasma-framework-ZIMEEb/plasma-framework-5.18.0/src/declarativeimports/core/windowthumbnail.cpp:282
#11 0x00007f2190e47803 in Plasma::WindowThumbnail::windowToTexture (this=0x31d0c10, textureNode=0x32ac8d0) at /build/plasma-framework-ZIMEEb/plasma-framework-5.18.0/src/declarativeimports/core/windowthumbnail.cpp:394
#12 0x00007f2190e47d24 in Plasma::WindowThumbnail::updatePaintNode (this=0x31d0c10, oldNode=<optimized out>, updatePaintNodeData=<optimized out>) at /build/plasma-framework-ZIMEEb/plasma-framework-5.18.0/src/declarativeimports/core/windowthumbnail.cpp:199
#13 0x00007f21a76d12d8 in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007f21a76d1b4b in QQuickWindowPrivate::updateDirtyNodes() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007f21a76d1cc0 in QQuickWindowPrivate::syncSceneGraph() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007f21a76a012c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#17 0x00007f21a76a1aa6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#18 0x00007f21a49352f5 in QWindow::event (this=0x30b76c0, ev=<optimized out>) at kernel/qwindow.cpp:2060
#19 0x00007f21a76db871 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#20 0x00007f21a91822db in PlasmaQuick::Dialog::event (this=this@entry=0x30b76c0, event=event@entry=0x7ffd6bc58ab0) at /build/plasma-framework-ZIMEEb/plasma-framework-5.18.0/src/plasmaquick/dialog.cpp:1168
#21 0x00007f2190e3fc45 in ToolTipDialog::event (this=0x30b76c0, e=0x7ffd6bc58ab0) at /build/plasma-framework-ZIMEEb/plasma-framework-5.18.0/src/declarativeimports/core/tooltipdialog.cpp:120
#22 0x00007f21a50ed05c in QApplicationPrivate::notify_helper (this=this@entry=0x16c16a0, receiver=receiver@entry=0x30b76c0, e=e@entry=0x7ffd6bc58ab0) at kernel/qapplication.cpp:3716
#23 0x00007f21a50f2516 in QApplication::notify (this=0x7ffd6bc58ed0, receiver=0x30b76c0, e=0x7ffd6bc58ab0) at kernel/qapplication.cpp:3499
#24 0x00007f21a45ea62b in QCoreApplication::notifyInternal (this=0x7ffd6bc58ed0, receiver=receiver@entry=0x30b76c0, event=event@entry=0x7ffd6bc58ab0) at kernel/qcoreapplication.cpp:965
#25 0x00007f21a492d4ec in QCoreApplication::sendSpontaneousEvent (event=0x7ffd6bc58ab0, receiver=0x30b76c0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#26 QGuiApplicationPrivate::processExposeEvent (e=0x2e9fcb0) at kernel/qguiapplication.cpp:2663
#27 0x00007f21a492e25d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x2e9fcb0) at kernel/qguiapplication.cpp:1658
#28 0x00007f21a4911f38 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#29 0x00007f2196acf070 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#30 0x00007f21a0aa91a7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f21a0aa9400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f21a0aa94ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007f21a4640a7f in QEventDispatcherGlib::processEvents (this=0x17004a0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#34 0x00007f21a45e7dea in QEventLoop::exec (this=this@entry=0x7ffd6bc58d70, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#35 0x00007f21a45efe8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#36 0x00007f21a4923c3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#37 0x00007f21a50e9495 in QApplication::exec () at kernel/qapplication.cpp:2976
#38 0x0000000000432d4a in main (argc=4, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181

Possible duplicates by query: bug 366702, bug 363380, bug 363371, bug 363359, bug 362526.

Reported using DrKonqi