Bug 362461

Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-21-generic x86_64
Distribution: Ubuntu 16.04 LTS

-- Information about the crash:
- What I was doing when the application crashed: Simply switched back to VirtualBox client (which is the Kubuntu 16.10 system). The crashes re-occure frequently but not always.

- Unusual behavior I noticed: Mouse integration seems to have a difference in position of mouse pointer sometimes. Mouse pointer is visible approx 30 pixel to the right and bottom of "real" position for the Kubuntu VirtualBox client. E.g.: When I want to resize a window, I gently have to pull the mouse pointer downwards to the right until I see the resize pointer symbol on screen.

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 0x7f817496f8c0 (LWP 2124))]

Thread 8 (Thread 0x7f815fb2f700 (LWP 2126)):
#0  0x00007f816f077e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f817313cc62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f817313e8d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f8161c7d629 in QXcbEventReader::run (this=0xd3c6d0) at qxcbconnection.cpp:1253
#4  0x00007f816f76d84e in QThreadPrivate::start (arg=0xd3c6d0) at thread/qthread_unix.cpp:331
#5  0x00007f816e85a6fa in start_thread (arg=0x7f815fb2f700) at pthread_create.c:333
#6  0x00007f816f083b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f815d2a6700 (LWP 2140)):
#0  0x00007f816be51a64 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f816be0ceba in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f816be0d380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f816be0d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f816f9a4a9b in QEventDispatcherGlib::processEvents (this=0x7f81500008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f816f94bdea in QEventLoop::exec (this=this@entry=0x7f815d2a5ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f816f7688a4 in QThread::exec (this=this@entry=0xe101c0) at thread/qthread.cpp:503
#7  0x00007f81720103c5 in QQmlThreadPrivate::run (this=0xe101c0) at qml/ftw/qqmlthread.cpp:141
#8  0x00007f816f76d84e in QThreadPrivate::start (arg=0xe101c0) at thread/qthread_unix.cpp:331
#9  0x00007f816e85a6fa in start_thread (arg=0x7f815d2a6700) at pthread_create.c:333
#10 0x00007f816f083b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f814a778700 (LWP 2158)):
#0  0x00007f816f077e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f816be0d31c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f816be0d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f816f9a4a9b in QEventDispatcherGlib::processEvents (this=0x7f81440008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f816f94bdea in QEventLoop::exec (this=this@entry=0x7f814a777ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f816f7688a4 in QThread::exec (this=this@entry=0x104d3e0) at thread/qthread.cpp:503
#6  0x00007f81720103c5 in QQmlThreadPrivate::run (this=0x104d3e0) at qml/ftw/qqmlthread.cpp:141
#7  0x00007f816f76d84e in QThreadPrivate::start (arg=0x104d3e0) at thread/qthread_unix.cpp:331
#8  0x00007f816e85a6fa in start_thread (arg=0x7f814a778700) at pthread_create.c:333
#9  0x00007f816f083b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f814895d700 (LWP 2159)):
#0  0x00007f816be51a64 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f816be0cd49 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f816be0d2c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f816be0d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f816f9a4a9b in QEventDispatcherGlib::processEvents (this=0x7f813c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f816f94bdea in QEventLoop::exec (this=this@entry=0x7f814895cce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f816f7688a4 in QThread::exec (this=this@entry=0x1143910) at thread/qthread.cpp:503
#7  0x00007f81720103c5 in QQmlThreadPrivate::run (this=0x1143910) at qml/ftw/qqmlthread.cpp:141
#8  0x00007f816f76d84e in QThreadPrivate::start (arg=0x1143910) at thread/qthread_unix.cpp:331
#9  0x00007f816e85a6fa in start_thread (arg=0x7f814895d700) at pthread_create.c:333
#10 0x00007f816f083b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f8142fbc700 (LWP 2160)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f81743b5bd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f81743b5c19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f816e85a6fa in start_thread (arg=0x7f8142fbc700) at pthread_create.c:333
#4  0x00007f816f083b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f80bbfff700 (LWP 2161)):
#0  0x00007f816be51a49 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f816be0cd5c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f816be0d2c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f816be0d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f816f9a4a9b in QEventDispatcherGlib::processEvents (this=0x7f80b40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f816f94bdea in QEventLoop::exec (this=this@entry=0x7f80bbffec90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f816f7688a4 in QThread::exec (this=this@entry=0x131e980) at thread/qthread.cpp:503
#7  0x00007f8172996ed6 in QQuickPixmapReader::run (this=0x131e980) at util/qquickpixmapcache.cpp:817
#8  0x00007f816f76d84e in QThreadPrivate::start (arg=0x131e980) at thread/qthread_unix.cpp:331
#9  0x00007f816e85a6fa in start_thread (arg=0x7f80bbfff700) at pthread_create.c:333
#10 0x00007f816f083b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f80ad6fb700 (LWP 2226)):
#0  0x00007f816f077e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f816be0d31c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f816be0d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f816f9a4a9b in QEventDispatcherGlib::processEvents (this=0x7f80a80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f816f94bdea in QEventLoop::exec (this=this@entry=0x7f80ad6facc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f816f7688a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f80afbdb7d7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f816f76d84e in QThreadPrivate::start (arg=0x207e990) at thread/qthread_unix.cpp:331
#8  0x00007f816e85a6fa in start_thread (arg=0x7f80ad6fb700) at pthread_create.c:333
#9  0x00007f816f083b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f817496f8c0 (LWP 2124)):
[KCrash Handler]
#6  __memmove_ssse3_back () at ../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:1574
#7  0x00007f815643f4ad in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#8  0x00007f815643dd95 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#9  0x00007f8157de4c1f in Plasma::WindowThumbnail::bindGLXTexture (this=this@entry=0x39a5bc0) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:447
#10 0x00007f8157de5e44 in Plasma::WindowThumbnail::windowToTextureGLX (this=this@entry=0x39a5bc0, textureNode=textureNode@entry=0x3a74a70) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:282
#11 0x00007f8157de6803 in Plasma::WindowThumbnail::windowToTexture (this=0x39a5bc0, textureNode=0x3a74a70) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:394
#12 0x00007f8157de6d24 in Plasma::WindowThumbnail::updatePaintNode (this=0x39a5bc0, oldNode=<optimized out>, updatePaintNodeData=<optimized out>) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:199
#13 0x00007f8172a352d8 in QQuickWindowPrivate::updateDirtyNode (this=this@entry=0x2f45640, item=item@entry=0x39a5bc0) at items/qquickwindow.cpp:2984
#14 0x00007f8172a35b4b in QQuickWindowPrivate::updateDirtyNodes (this=this@entry=0x2f45640) at items/qquickwindow.cpp:2722
#15 0x00007f8172a35cc0 in QQuickWindowPrivate::syncSceneGraph (this=this@entry=0x2f45640) at items/qquickwindow.cpp:341
#16 0x00007f8172a0412c in QSGGuiThreadRenderLoop::renderWindow (this=this@entry=0xf76210, window=0x2bb7370) at scenegraph/qsgrenderloop.cpp:372
#17 0x00007f8172a05aa6 in QSGGuiThreadRenderLoop::exposureChanged (this=0xf76210, window=0x2bb7370) at scenegraph/qsgrenderloop.cpp:422
#18 0x00007f816fc992e5 in QWindow::event (this=this@entry=0x2bb7370, ev=ev@entry=0x7ffc1e5e4dd0) at kernel/qwindow.cpp:2060
#19 0x00007f8172a3f871 in QQuickWindow::event (this=this@entry=0x2bb7370, e=e@entry=0x7ffc1e5e4dd0) at items/qquickwindow.cpp:1413
#20 0x00007f81744e62eb in PlasmaQuick::Dialog::event (this=this@entry=0x2bb7370, event=event@entry=0x7ffc1e5e4dd0) at ../../../src/plasmaquick/dialog.cpp:1168
#21 0x00007f8157ddec45 in ToolTipDialog::event (this=0x2bb7370, e=0x7ffc1e5e4dd0) at ../../../../src/declarativeimports/core/tooltipdialog.cpp:120
#22 0x00007f817045105c in QApplicationPrivate::notify_helper (this=this@entry=0xd21690, receiver=receiver@entry=0x2bb7370, e=e@entry=0x7ffc1e5e4dd0) at kernel/qapplication.cpp:3716
#23 0x00007f8170456516 in QApplication::notify (this=0x7ffc1e5e51f0, receiver=0x2bb7370, e=0x7ffc1e5e4dd0) at kernel/qapplication.cpp:3499
#24 0x00007f816f94e62b in QCoreApplication::notifyInternal (this=0x7ffc1e5e51f0, receiver=receiver@entry=0x2bb7370, event=event@entry=0x7ffc1e5e4dd0) at kernel/qcoreapplication.cpp:965
#25 0x00007f816fc914ec in QCoreApplication::sendSpontaneousEvent (event=0x7ffc1e5e4dd0, receiver=0x2bb7370) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#26 QGuiApplicationPrivate::processExposeEvent (e=0x3498f80) at kernel/qguiapplication.cpp:2663
#27 0x00007f816fc9225d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x3498f80) at kernel/qguiapplication.cpp:1658
#28 0x00007f816fc75f38 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#29 0x00007f8161caef10 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#30 0x00007f816be0d127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f816be0d380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f816be0d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007f816f9a4a7f in QEventDispatcherGlib::processEvents (this=0xd60e60, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#34 0x00007f816f94bdea in QEventLoop::exec (this=this@entry=0x7ffc1e5e5090, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#35 0x00007f816f953e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#36 0x00007f816fc87c3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#37 0x00007f817044d495 in QApplication::exec () at kernel/qapplication.cpp:2976
#38 0x0000000000432d4a in main (argc=2, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181

Possible duplicates by query: bug 362168, bug 359825.

Reported using DrKonqi