Created attachment 99103 [details]
Crash report

Crashes start shortly after boot up and starting Thunderbird.  These crashes happen hundreds of times a day and seem to be triggered by dropping the cursor into the task manager bar  area.
It seems starting Thunderbird sets the stage and shutting it down seems to lessen the crashes.

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 0x7f975ef078c0 (LWP 3117))]

Thread 12 (Thread 0x7f974a04d700 (LWP 3120)):
#0  0x00007f97595a0e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f975d6afc62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f975d6b18d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f974c1c7629 in QXcbEventReader::run (this=0x1c74670) at qxcbconnection.cpp:1253
#4  0x00007f9759ca384e in QThreadPrivate::start (arg=0x1c74670) at thread/qthread_unix.cpp:331
#5  0x00007f9758d756fa in start_thread (arg=0x7f974a04d700) at pthread_create.c:333
#6  0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7f97435ed700 (LWP 3122)):
#0  0x00007f975959c9cd in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f975630b6c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97562c7e04 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97562c82c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f97562c842c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f9759edaa9b in QEventDispatcherGlib::processEvents (this=0x7f973c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#6  0x00007f9759e81dea in QEventLoop::exec (this=this@entry=0x7f97435ecce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f9759c9e8a4 in QThread::exec (this=this@entry=0x1d4c930) at thread/qthread.cpp:503
#8  0x00007f975c5673c5 in QQmlThreadPrivate::run (this=0x1d4c930) at qml/ftw/qqmlthread.cpp:141
#9  0x00007f9759ca384e in QThreadPrivate::start (arg=0x1d4c930) at thread/qthread_unix.cpp:331
#10 0x00007f9758d756fa in start_thread (arg=0x7f97435ed700) at pthread_create.c:333
#11 0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f9738b85700 (LWP 3127)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9740ce4aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f9740ce4907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f9758d756fa in start_thread (arg=0x7f9738b85700) at pthread_create.c:333
#4  0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f9738384700 (LWP 3128)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9740ce4aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f9740ce4907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f9758d756fa in start_thread (arg=0x7f9738384700) at pthread_create.c:333
#4  0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f9737b83700 (LWP 3129)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9740ce4aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f9740ce4907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f9758d756fa in start_thread (arg=0x7f9737b83700) at pthread_create.c:333
#4  0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f9737382700 (LWP 3130)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9740ce4aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f9740ce4907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f9758d756fa in start_thread (arg=0x7f9737382700) at pthread_create.c:333
#4  0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f9732b0d700 (LWP 3131)):
#0  0x00007f97595a0e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f97562c831c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97562c842c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9759edaa9b in QEventDispatcherGlib::processEvents (this=0x7f972c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f9759e81dea in QEventLoop::exec (this=this@entry=0x7f9732b0cce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f9759c9e8a4 in QThread::exec (this=this@entry=0x1fcd9a0) at thread/qthread.cpp:503
#6  0x00007f975c5673c5 in QQmlThreadPrivate::run (this=0x1fcd9a0) at qml/ftw/qqmlthread.cpp:141
#7  0x00007f9759ca384e in QThreadPrivate::start (arg=0x1fcd9a0) at thread/qthread_unix.cpp:331
#8  0x00007f9758d756fa in start_thread (arg=0x7f9732b0d700) at pthread_create.c:333
#9  0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f9730d3d700 (LWP 3132)):
#0  0x00007f975630ca64 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f97562c731e in g_main_context_acquire () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97562c81d5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97562c842c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f9759edaa9b in QEventDispatcherGlib::processEvents (this=0x7f97240008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f9759e81dea in QEventLoop::exec (this=this@entry=0x7f9730d3cce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9759c9e8a4 in QThread::exec (this=this@entry=0x20e5170) at thread/qthread.cpp:503
#7  0x00007f975c5673c5 in QQmlThreadPrivate::run (this=0x20e5170) at qml/ftw/qqmlthread.cpp:141
#8  0x00007f9759ca384e in QThreadPrivate::start (arg=0x20e5170) at thread/qthread_unix.cpp:331
#9  0x00007f9758d756fa in start_thread (arg=0x7f9730d3d700) at pthread_create.c:333
#10 0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f972b3d5700 (LWP 3133)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f975e942bd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f975e942c19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f9758d756fa in start_thread (arg=0x7f972b3d5700) at pthread_create.c:333
#4  0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f9728a4d700 (LWP 3134)):
#0  0x00007f97595a0e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f97562c831c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97562c842c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9759edaa9b in QEventDispatcherGlib::processEvents (this=0x7f96a00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f9759e81dea in QEventLoop::exec (this=this@entry=0x7f9728a4cc90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f9759c9e8a4 in QThread::exec (this=this@entry=0x22b2ef0) at thread/qthread.cpp:503
#6  0x00007f975cefeed6 in QQuickPixmapReader::run (this=0x22b2ef0) at util/qquickpixmapcache.cpp:817
#7  0x00007f9759ca384e in QThreadPrivate::start (arg=0x22b2ef0) at thread/qthread_unix.cpp:331
#8  0x00007f9758d756fa in start_thread (arg=0x7f9728a4d700) at pthread_create.c:333
#9  0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f9691fe5700 (LWP 3135)):
#0  __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:65
#1  0x00007f97595a0e82 in poll () at ../sysdeps/unix/syscall-template.S:84
#2  0x00007f97562c831c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97562c842c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f9759edaa9b in QEventDispatcherGlib::processEvents (this=0x7f968c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f9759e81dea in QEventLoop::exec (this=this@entry=0x7f9691fe4cc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9759c9e8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f96945057d7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f9759ca384e in QThreadPrivate::start (arg=0x29cd010) at thread/qthread_unix.cpp:331
#9  0x00007f9758d756fa in start_thread (arg=0x7f9691fe5700) at pthread_create.c:333
#10 0x00007f97595acb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f975ef078c0 (LWP 3117)):
[KCrash Handler]
#6  __memmove_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:114
#7  0x00007f97409744ad in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#8  0x00007f9740972d95 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#9  0x00007f97423cac1f in Plasma::WindowThumbnail::bindGLXTexture (this=this@entry=0x3e5d6a0) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:447
#10 0x00007f97423cbe44 in Plasma::WindowThumbnail::windowToTextureGLX (this=this@entry=0x3e5d6a0, textureNode=textureNode@entry=0x357be80) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:282
#11 0x00007f97423cc803 in Plasma::WindowThumbnail::windowToTexture (this=0x3e5d6a0, textureNode=0x357be80) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:394
#12 0x00007f97423ccd24 in Plasma::WindowThumbnail::updatePaintNode (this=0x3e5d6a0, oldNode=<optimized out>, updatePaintNodeData=<optimized out>) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:199
#13 0x00007f975cf9d2d8 in QQuickWindowPrivate::updateDirtyNode (this=this@entry=0x29ad5e0, item=item@entry=0x3e5d6a0) at items/qquickwindow.cpp:2984
#14 0x00007f975cf9db4b in QQuickWindowPrivate::updateDirtyNodes (this=this@entry=0x29ad5e0) at items/qquickwindow.cpp:2722
#15 0x00007f975cf9dcc0 in QQuickWindowPrivate::syncSceneGraph (this=this@entry=0x29ad5e0) at items/qquickwindow.cpp:341
#16 0x00007f975cf6c12c in QSGGuiThreadRenderLoop::renderWindow (this=this@entry=0x1e025f0, window=0x3544460) at scenegraph/qsgrenderloop.cpp:372
#17 0x00007f975cf6d2a1 in QSGGuiThreadRenderLoop::event (this=0x1e025f0, e=<optimized out>) at scenegraph/qsgrenderloop.cpp:474
#18 0x00007f975a98905c in QApplicationPrivate::notify_helper (this=this@entry=0x1c59690, receiver=receiver@entry=0x1e025f0, e=e@entry=0x7fff8516d030) at kernel/qapplication.cpp:3716
#19 0x00007f975a98e516 in QApplication::notify (this=0x7fff8516d3d0, receiver=0x1e025f0, e=0x7fff8516d030) at kernel/qapplication.cpp:3499
#20 0x00007f9759e8462b in QCoreApplication::notifyInternal (this=0x7fff8516d3d0, receiver=0x1e025f0, event=event@entry=0x7fff8516d030) at kernel/qcoreapplication.cpp:965
#21 0x00007f9759ed989d in QCoreApplication::sendEvent (event=0x7fff8516d030, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#22 QTimerInfoList::activateTimers (this=0x1c9d910) at kernel/qtimerinfo_unix.cpp:637
#23 0x00007f9759ed9da1 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#24 0x00007f97562c8127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f97562c8380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f97562c842c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f9759edaa7f in QEventDispatcherGlib::processEvents (this=0x1c984e0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#28 0x00007f9759e81dea in QEventLoop::exec (this=this@entry=0x7fff8516d270, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#29 0x00007f9759e89e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#30 0x00007f975a1bfc3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#31 0x00007f975a985495 in QApplication::exec () at kernel/qapplication.cpp:2976
#32 0x0000000000432d4a in main (argc=4, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181