Bug 362669

Comment on attachment 98771 [details]
crash-file

Running inside VBox...

Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-22-generic x86_64
Distribution: Ubuntu 16.04 LTS

-- 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 0x7f6a3db398c0 (LWP 19594))]

Thread 12 (Thread 0x7f6a28c60700 (LWP 19597)):
#0  0x00007f6a381dbe8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6a3c2eac62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f6a3c2ec8d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f6a2adda629 in QXcbEventReader::run (this=0x1c4b680) at qxcbconnection.cpp:1253
#4  0x00007f6a388de84e in QThreadPrivate::start (arg=0x1c4b680) at thread/qthread_unix.cpp:331
#5  0x00007f6a379b06fa in start_thread (arg=0x7f6a28c60700) at pthread_create.c:333
#6  0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7f6a223e8700 (LWP 19599)):
#0  0x00007f6a381dbe8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6a34f0b31c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6a34f0b42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6a38b15a9b in QEventDispatcherGlib::processEvents (this=0x7f6a1c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f6a38abcdea in QEventLoop::exec (this=this@entry=0x7f6a223e7ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f6a388d98a4 in QThread::exec (this=this@entry=0x1d19b70) at thread/qthread.cpp:503
#6  0x00007f6a3b1a23c5 in QQmlThreadPrivate::run (this=0x1d19b70) at qml/ftw/qqmlthread.cpp:141
#7  0x00007f6a388de84e in QThreadPrivate::start (arg=0x1d19b70) at thread/qthread_unix.cpp:331
#8  0x00007f6a379b06fa in start_thread (arg=0x7f6a223e8700) at pthread_create.c:333
#9  0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f6a17820700 (LWP 19600)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6a1b747aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f6a1b747907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f6a379b06fa in start_thread (arg=0x7f6a17820700) at pthread_create.c:333
#4  0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f6a1701f700 (LWP 19601)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6a1b747aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f6a1b747907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f6a379b06fa in start_thread (arg=0x7f6a1701f700) at pthread_create.c:333
#4  0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f6a1681e700 (LWP 19602)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6a1b747aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f6a1b747907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f6a379b06fa in start_thread (arg=0x7f6a1681e700) at pthread_create.c:333
#4  0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f6a1601d700 (LWP 19603)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6a1b747aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f6a1b747907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f6a379b06fa in start_thread (arg=0x7f6a1601d700) at pthread_create.c:333
#4  0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f6a117a8700 (LWP 19608)):
#0  0x00007f6a381d79cd in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6a34f4e6c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6a34f0ae04 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6a34f0b2c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f6a34f0b42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f6a38b15a9b in QEventDispatcherGlib::processEvents (this=0x7f6a0c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#6  0x00007f6a38abcdea in QEventLoop::exec (this=this@entry=0x7f6a117a7ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f6a388d98a4 in QThread::exec (this=this@entry=0x1fb2770) at thread/qthread.cpp:503
#8  0x00007f6a3b1a23c5 in QQmlThreadPrivate::run (this=0x1fb2770) at qml/ftw/qqmlthread.cpp:141
#9  0x00007f6a388de84e in QThreadPrivate::start (arg=0x1fb2770) at thread/qthread_unix.cpp:331
#10 0x00007f6a379b06fa in start_thread (arg=0x7f6a117a8700) at pthread_create.c:333
#11 0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f6a0b828700 (LWP 19609)):
#0  0x00007ffdf3fe3b4c in clock_gettime ()
#1  0x00007f6a381f5fb6 in __GI___clock_gettime (clock_id=1, tp=tp@entry=0x7f6a0b827a50) at ../sysdeps/unix/clock_gettime.c:115
#2  0x00007f6a3898ec16 in qt_clock_gettime (ts=0x7f6a0b827a50, clock=<optimized out>) at tools/qelapsedtimer_unix.cpp:105
#3  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:156
#4  qt_gettime () at tools/qelapsedtimer_unix.cpp:165
#5  0x00007f6a38b13529 in QTimerInfoList::updateCurrentTime (this=this@entry=0x7f6a04002ed0) at kernel/qtimerinfo_unix.cpp:84
#6  0x00007f6a38b13a95 in QTimerInfoList::timerWait (this=0x7f6a04002ed0, tm=...) at kernel/qtimerinfo_unix.cpp:381
#7  0x00007f6a38b14e7e in timerSourcePrepareHelper (timeout=0x7f6a0b827b24, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:127
#8  timerSourcePrepare (source=<optimized out>, timeout=0x7f6a0b827b24) at kernel/qeventdispatcher_glib.cpp:160
#9  0x00007f6a34f0a8ad in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f6a34f0b24b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f6a34f0b42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f6a38b15a9b in QEventDispatcherGlib::processEvents (this=0x7f6a040008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#13 0x00007f6a38abcdea in QEventLoop::exec (this=this@entry=0x7f6a0b827ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#14 0x00007f6a388d98a4 in QThread::exec (this=this@entry=0x20927c0) at thread/qthread.cpp:503
#15 0x00007f6a3b1a23c5 in QQmlThreadPrivate::run (this=0x20927c0) at qml/ftw/qqmlthread.cpp:141
#16 0x00007f6a388de84e in QThreadPrivate::start (arg=0x20927c0) at thread/qthread_unix.cpp:331
#17 0x00007f6a379b06fa in start_thread (arg=0x7f6a0b828700) at pthread_create.c:333
#18 0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f6a09f58700 (LWP 19610)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6a3d57dbd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f6a3d57dc19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f6a379b06fa in start_thread (arg=0x7f6a09f58700) at pthread_create.c:333
#4  0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f6982b70700 (LWP 19611)):
#0  0x00007f6a381dbe8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6a34f0b31c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6a34f0b42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6a38b15a9b in QEventDispatcherGlib::processEvents (this=0x7f697c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f6a38abcdea in QEventLoop::exec (this=this@entry=0x7f6982b6fc90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f6a388d98a4 in QThread::exec (this=this@entry=0x255da60) at thread/qthread.cpp:503
#6  0x00007f6a3bb39ed6 in QQuickPixmapReader::run (this=0x255da60) at util/qquickpixmapcache.cpp:817
#7  0x00007f6a388de84e in QThreadPrivate::start (arg=0x255da60) at thread/qthread_unix.cpp:331
#8  0x00007f6a379b06fa in start_thread (arg=0x7f6982b70700) at pthread_create.c:333
#9  0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f696f7c8700 (LWP 19613)):
#0  0x00007f6a34f4fa49 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f6a34f0ad5c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6a34f0b2c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6a34f0b42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f6a38b15a9b in QEventDispatcherGlib::processEvents (this=0x7f69680008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f6a38abcdea in QEventLoop::exec (this=this@entry=0x7f696f7c7cc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f6a388d98a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f6971ce87d7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f6a388de84e in QThreadPrivate::start (arg=0x23011d0) at thread/qthread_unix.cpp:331
#9  0x00007f6a379b06fa in start_thread (arg=0x7f696f7c8700) at pthread_create.c:333
#10 0x00007f6a381e7b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f6a3db398c0 (LWP 19594)):
[KCrash Handler]
#6  __memmove_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:114
#7  0x00007f6a1b3d74ad in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#8  0x00007f6a1b3d5d95 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#9  0x00007f6a2114dc1f in Plasma::WindowThumbnail::bindGLXTexture (this=this@entry=0x54e44e0) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:447
#10 0x00007f6a2114ee44 in Plasma::WindowThumbnail::windowToTextureGLX (this=this@entry=0x54e44e0, textureNode=textureNode@entry=0x2a06590) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:282
#11 0x00007f6a2114f803 in Plasma::WindowThumbnail::windowToTexture (this=0x54e44e0, textureNode=0x2a06590) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:394
#12 0x00007f6a2114fd24 in Plasma::WindowThumbnail::updatePaintNode (this=0x54e44e0, oldNode=<optimized out>, updatePaintNodeData=<optimized out>) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:199
#13 0x00007f6a3bbd82d8 in QQuickWindowPrivate::updateDirtyNode (this=this@entry=0x4c8acf0, item=item@entry=0x54e44e0) at items/qquickwindow.cpp:2984
#14 0x00007f6a3bbd8b4b in QQuickWindowPrivate::updateDirtyNodes (this=this@entry=0x4c8acf0) at items/qquickwindow.cpp:2722
#15 0x00007f6a3bbd8cc0 in QQuickWindowPrivate::syncSceneGraph (this=this@entry=0x4c8acf0) at items/qquickwindow.cpp:341
#16 0x00007f6a3bba712c in QSGGuiThreadRenderLoop::renderWindow (this=this@entry=0x1e8bc20, window=0x506b600) at scenegraph/qsgrenderloop.cpp:372
#17 0x00007f6a3bba8aa6 in QSGGuiThreadRenderLoop::exposureChanged (this=0x1e8bc20, window=0x506b600) at scenegraph/qsgrenderloop.cpp:422
#18 0x00007f6a38e0c2e5 in QWindow::event (this=this@entry=0x506b600, ev=ev@entry=0x7ffdf3f83580) at kernel/qwindow.cpp:2060
#19 0x00007f6a3bbe2871 in QQuickWindow::event (this=this@entry=0x506b600, e=e@entry=0x7ffdf3f83580) at items/qquickwindow.cpp:1413
#20 0x00007f6a3d6ae2eb in PlasmaQuick::Dialog::event (this=this@entry=0x506b600, event=event@entry=0x7ffdf3f83580) at ../../../src/plasmaquick/dialog.cpp:1168
#21 0x00007f6a21147c45 in ToolTipDialog::event (this=0x506b600, e=0x7ffdf3f83580) at ../../../../src/declarativeimports/core/tooltipdialog.cpp:120
#22 0x00007f6a395c405c in QApplicationPrivate::notify_helper (this=this@entry=0x1c306a0, receiver=receiver@entry=0x506b600, e=e@entry=0x7ffdf3f83580) at kernel/qapplication.cpp:3716
#23 0x00007f6a395c9516 in QApplication::notify (this=0x7ffdf3f839a0, receiver=0x506b600, e=0x7ffdf3f83580) at kernel/qapplication.cpp:3499
#24 0x00007f6a38abf62b in QCoreApplication::notifyInternal (this=0x7ffdf3f839a0, receiver=receiver@entry=0x506b600, event=event@entry=0x7ffdf3f83580) at kernel/qcoreapplication.cpp:965
#25 0x00007f6a38e044ec in QCoreApplication::sendSpontaneousEvent (event=0x7ffdf3f83580, receiver=0x506b600) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#26 QGuiApplicationPrivate::processExposeEvent (e=0x2a03ba0) at kernel/qguiapplication.cpp:2663
#27 0x00007f6a38e0525d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x2a03ba0) at kernel/qguiapplication.cpp:1658
#28 0x00007f6a38de8f38 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#29 0x00007f6a2ae0bf10 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#30 0x00007f6a34f0b127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f6a34f0b380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f6a34f0b42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007f6a38b15a7f in QEventDispatcherGlib::processEvents (this=0x1c6eb70, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#34 0x00007f6a38abcdea in QEventLoop::exec (this=this@entry=0x7ffdf3f83840, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#35 0x00007f6a38ac4e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#36 0x00007f6a38dfac3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#37 0x00007f6a395c0495 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

Report to https://bugs.kde.org/

Since upgrading to Kubuntu 16.04, my plasmashell also crashes. The window bar disappears for a few seconds and restarts.

To me, it looks like this happens when I try to select another window by mouse click and the preview of the window gets shown. I can reproduce the bug by just hovering with the mouse over an entry in the window bar.


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 0x7f999fd7d8c0 (LWP 6141))]

Thread 12 (Thread 0x7f998af1b700 (LWP 6143)):
#0  0x00007f999a490e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f999e555c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f999e5578d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f998d069629 in QXcbEventReader::run (this=0x254f660) at qxcbconnection.cpp:1253
#4  0x00007f999ab8684e in QThreadPrivate::start (arg=0x254f660) at thread/qthread_unix.cpp:331
#5  0x00007f9999c736fa in start_thread (arg=0x7f998af1b700) at pthread_create.c:333
#6  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7f9983fff700 (LWP 6146)):
#0  0x00007f999a490e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f999722631c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f999722642c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f999adbda9b in QEventDispatcherGlib::processEvents (this=0x7f997c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f999ad64dea in QEventLoop::exec (this=this@entry=0x7f9983ffece0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f999ab818a4 in QThread::exec (this=this@entry=0x263d450) at thread/qthread.cpp:503
#6  0x00007f999d4293c5 in QQmlThreadPrivate::run (this=0x263d450) at qml/ftw/qqmlthread.cpp:141
#7  0x00007f999ab8684e in QThreadPrivate::start (arg=0x263d450) at thread/qthread_unix.cpp:331
#8  0x00007f9999c736fa in start_thread (arg=0x7f9983fff700) at pthread_create.c:333
#9  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f997962c700 (LWP 6151)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f99819c3aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f99819c3907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f9999c736fa in start_thread (arg=0x7f997962c700) at pthread_create.c:333
#4  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f9978e2b700 (LWP 6152)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f99819c3aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f99819c3907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f9999c736fa in start_thread (arg=0x7f9978e2b700) at pthread_create.c:333
#4  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f997862a700 (LWP 6153)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f99819c3aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f99819c3907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f9999c736fa in start_thread (arg=0x7f997862a700) at pthread_create.c:333
#4  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f9977e29700 (LWP 6154)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f99819c3aa3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f99819c3907 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f9999c736fa in start_thread (arg=0x7f9977e29700) at pthread_create.c:333
#4  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f997382e700 (LWP 6155)):
#0  0x00007f999a490e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f999722631c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f999722642c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f999adbda9b in QEventDispatcherGlib::processEvents (this=0x7f996c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f999ad64dea in QEventLoop::exec (this=this@entry=0x7f997382dce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f999ab818a4 in QThread::exec (this=this@entry=0x287f480) at thread/qthread.cpp:503
#6  0x00007f999d4293c5 in QQmlThreadPrivate::run (this=0x287f480) at qml/ftw/qqmlthread.cpp:141
#7  0x00007f999ab8684e in QThreadPrivate::start (arg=0x287f480) at thread/qthread_unix.cpp:331
#8  0x00007f9999c736fa in start_thread (arg=0x7f997382e700) at pthread_create.c:333
#9  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f9971a70700 (LWP 6156)):
#0  0x00007f9997223420 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f9997225928 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f999722624b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f999722642c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f999adbda9b in QEventDispatcherGlib::processEvents (this=0x7f99640008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f999ad64dea in QEventLoop::exec (this=this@entry=0x7f9971a6fce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f999ab818a4 in QThread::exec (this=this@entry=0x29564b0) at thread/qthread.cpp:503
#7  0x00007f999d4293c5 in QQmlThreadPrivate::run (this=0x29564b0) at qml/ftw/qqmlthread.cpp:141
#8  0x00007f999ab8684e in QThreadPrivate::start (arg=0x29564b0) at thread/qthread_unix.cpp:331
#9  0x00007f9999c736fa in start_thread (arg=0x7f9971a70700) at pthread_create.c:333
#10 0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f996bfff700 (LWP 6157)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f999f7cebd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f999f7cec19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f9999c736fa in start_thread (arg=0x7f996bfff700) at pthread_create.c:333
#4  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f9969776700 (LWP 6159)):
#0  _dl_update_slotinfo (req_modid=<optimized out>) at dl-tls.c:735
#1  0x00007f999fd47aac in update_get_addr (ti=0x7f999afb1788) at dl-tls.c:802
#2  0x00007f999ab85792 in get_thread_data () at thread/qthread_unix.cpp:181
#3  QThreadData::current (createIfNecessary=createIfNecessary@entry=true) at thread/qthread_unix.cpp:212
#4  0x00007f999adbcffa in postEventSourcePrepare (s=0x7f98e00012d0, timeout=0x7f9969775ad4) at kernel/qeventdispatcher_glib.cpp:247
#5  0x00007f99972258ad in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f999722624b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f999722642c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f999adbda9b in QEventDispatcherGlib::processEvents (this=0x7f98e00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#9  0x00007f999ad64dea in QEventLoop::exec (this=this@entry=0x7f9969775c90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#10 0x00007f999ab818a4 in QThread::exec (this=this@entry=0x2b5cdf0) at thread/qthread.cpp:503
#11 0x00007f999ddafed6 in QQuickPixmapReader::run (this=0x2b5cdf0) at util/qquickpixmapcache.cpp:817
#12 0x00007f999ab8684e in QThreadPrivate::start (arg=0x2b5cdf0) at thread/qthread_unix.cpp:331
#13 0x00007f9999c736fa in start_thread (arg=0x7f9969776700) at pthread_create.c:333
#14 0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f98d5d9d700 (LWP 6169)):
#0  0x00007f999a490e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f999722631c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f999722642c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f999adbda9b in QEventDispatcherGlib::processEvents (this=0x7f98d00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f999ad64dea in QEventLoop::exec (this=this@entry=0x7f98d5d9ccc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f999ab818a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f98d827d7d7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f999ab8684e in QThreadPrivate::start (arg=0x3926ff0) at thread/qthread_unix.cpp:331
#8  0x00007f9999c736fa in start_thread (arg=0x7f98d5d9d700) at pthread_create.c:333
#9  0x00007f999a49cb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f999fd7d8c0 (LWP 6141)):
[KCrash Handler]
#6  __memmove_ssse3_back () at ../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:1574
#7  0x00007f99816534ad in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#8  0x00007f9981651d95 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#9  0x00007f9988135c1f in Plasma::WindowThumbnail::bindGLXTexture (this=this@entry=0x3bff5d0) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:447
#10 0x00007f9988136e44 in Plasma::WindowThumbnail::windowToTextureGLX (this=this@entry=0x3bff5d0, textureNode=textureNode@entry=0x5d3eb90) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:282
#11 0x00007f9988137803 in Plasma::WindowThumbnail::windowToTexture (this=0x3bff5d0, textureNode=0x5d3eb90) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:394
#12 0x00007f9988137d24 in Plasma::WindowThumbnail::updatePaintNode (this=0x3bff5d0, oldNode=<optimized out>, updatePaintNodeData=<optimized out>) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:199
#13 0x00007f999de4e2d8 in QQuickWindowPrivate::updateDirtyNode (this=this@entry=0x3d60e20, item=item@entry=0x3bff5d0) at items/qquickwindow.cpp:2984
#14 0x00007f999de4eb4b in QQuickWindowPrivate::updateDirtyNodes (this=this@entry=0x3d60e20) at items/qquickwindow.cpp:2722
#15 0x00007f999de4ecc0 in QQuickWindowPrivate::syncSceneGraph (this=this@entry=0x3d60e20) at items/qquickwindow.cpp:341
#16 0x00007f999de1d12c in QSGGuiThreadRenderLoop::renderWindow (this=this@entry=0x27a8ea0, window=0x4014050) at scenegraph/qsgrenderloop.cpp:372
#17 0x00007f999de1eaa6 in QSGGuiThreadRenderLoop::exposureChanged (this=0x27a8ea0, window=0x4014050) at scenegraph/qsgrenderloop.cpp:422
#18 0x00007f999b0b22f5 in QWindow::event (this=this@entry=0x4014050, ev=ev@entry=0x7ffc5f46cae0) at kernel/qwindow.cpp:2060
#19 0x00007f999de58871 in QQuickWindow::event (this=this@entry=0x4014050, e=e@entry=0x7ffc5f46cae0) at items/qquickwindow.cpp:1413
#20 0x00007f999f8ff2eb in PlasmaQuick::Dialog::event (this=this@entry=0x4014050, event=event@entry=0x7ffc5f46cae0) at ../../../src/plasmaquick/dialog.cpp:1168
#21 0x00007f998812fc45 in ToolTipDialog::event (this=0x4014050, e=0x7ffc5f46cae0) at ../../../../src/declarativeimports/core/tooltipdialog.cpp:120
#22 0x00007f999b86a05c in QApplicationPrivate::notify_helper (this=this@entry=0x25346a0, receiver=receiver@entry=0x4014050, e=e@entry=0x7ffc5f46cae0) at kernel/qapplication.cpp:3716
#23 0x00007f999b86f516 in QApplication::notify (this=0x7ffc5f46cf00, receiver=0x4014050, e=0x7ffc5f46cae0) at kernel/qapplication.cpp:3499
#24 0x00007f999ad6762b in QCoreApplication::notifyInternal (this=0x7ffc5f46cf00, receiver=receiver@entry=0x4014050, event=event@entry=0x7ffc5f46cae0) at kernel/qcoreapplication.cpp:965
#25 0x00007f999b0aa4ec in QCoreApplication::sendSpontaneousEvent (event=0x7ffc5f46cae0, receiver=0x4014050) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#26 QGuiApplicationPrivate::processExposeEvent (e=0x3aa6e70) at kernel/qguiapplication.cpp:2663
#27 0x00007f999b0ab25d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x3aa6e70) at kernel/qguiapplication.cpp:1658
#28 0x00007f999b08ef38 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#29 0x00007f998d09b070 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#30 0x00007f9997226127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f9997226380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f999722642c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007f999adbda7f in QEventDispatcherGlib::processEvents (this=0x25735e0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#34 0x00007f999ad64dea in QEventLoop::exec (this=this@entry=0x7ffc5f46cda0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#35 0x00007f999ad6ce8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#36 0x00007f999b0a0c3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#37 0x00007f999b866495 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

(In reply to Sebastian Stein from comment #2)
> Since upgrading to Kubuntu 16.04, my plasmashell also crashes. The window
> bar disappears for a few seconds and restarts.
> 
> To me, it looks like this happens when I try to select another window by
> mouse click and the preview of the window gets shown. I can reproduce the
> bug by just hovering with the mouse over an entry in the window bar.

And I probably should mention that I'm also running Kubuntu inside VirtualBox hosted on Windows. So maybe it is a problem related to the graphics driver or similar.

*** This bug has been marked as a duplicate of bug 363371 ***