Bug 421741

Application: plasmashell (5.18.5)

Qt Version: 5.14.1
Frameworks Version: 5.70.0
Operating System: Linux 5.6.11-1-default x86_64
Windowing system: X11
Distribution: "openSUSE Tumbleweed"

-- Information about the crash:
- What I was doing when the application crashed: I was logging into the desktop. This happen before a few days ago but I have not had an issue until today. 

- Unusual behavior I noticed: Screen went black and the system seemed to "hang." I have ownCloud desktop app autostarting but no other programs that start at the same time.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fdbb3803800 (LWP 2330))]

Thread 10 (Thread 0x7fdb80cfc700 (LWP 2734)):
#0  0x00007fdbb42e3a6c in ?? () from /usr/lib64/libglib-2.0.so.0
#1  0x00007fdbb42e534f in g_main_context_check () from /usr/lib64/libglib-2.0.so.0
#2  0x00007fdbb42e5982 in ?? () from /usr/lib64/libglib-2.0.so.0
#3  0x00007fdbb42e5aff in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007fdbb5d91beb in QEventDispatcherGlib::processEvents (this=0x7fdb7c000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007fdbb5d39b7b in QEventLoop::exec (this=this@entry=0x7fdb80cfbd60, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#6  0x00007fdbb5b645ce in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#7  0x00007fdb81241e68 in KCupsConnection::run() () from /usr/lib64/libkcupslib.so
#8  0x00007fdbb5b65698 in QThreadPrivate::start (arg=0x55fdaa50af70) at thread/qthread_unix.cpp:342
#9  0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#10 0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7fdb9d21a700 (LWP 2726)):
#0  0x00007fdbb5b65c02 in QMutex::unlock (this=this@entry=0x55fda95ddd60) at /usr/include/c++/9/bits/atomic_base.h:769
#1  0x00007fdbb5d91aee in QMutexLocker::unlock (this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:270
#2  QMutexLocker::~QMutexLocker (this=<synthetic pointer>, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:243
#3  QThreadData::canWaitLocked (this=0x55fda95ddd30) at ../../include/QtCore/5.14.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:272
#4  postEventSourcePrepare (s=0x7fdb8c004bb0, timeout=0x7fdb9d219b94) at kernel/qeventdispatcher_glib.cpp:260
#5  0x00007fdbb42e4f6a in g_main_context_prepare () from /usr/lib64/libglib-2.0.so.0
#6  0x00007fdbb42e590b in ?? () from /usr/lib64/libglib-2.0.so.0
#7  0x00007fdbb42e5aff in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#8  0x00007fdbb5d91beb in QEventDispatcherGlib::processEvents (this=0x7fdb8c000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#9  0x00007fdbb5d39b7b in QEventLoop::exec (this=this@entry=0x7fdb9d219d60, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#10 0x00007fdbb5b645ce in QThread::exec (this=this@entry=0x7fdba0086d90) at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#11 0x00007fdbb77b70e6 in QQuickPixmapReader::run (this=0x7fdba0086d90) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/util/qquickpixmapcache.cpp:987
#12 0x00007fdbb5b65698 in QThreadPrivate::start (arg=0x7fdba0086d90) at thread/qthread_unix.cpp:342
#13 0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#14 0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7fdb9f7fe700 (LWP 2692)):
#0  0x00007fdbb4fe8795 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fdba9b4681b in ?? () from /usr/lib64/dri/i965_dri.so
#2  0x00007fdba9b46697 in ?? () from /usr/lib64/dri/i965_dri.so
#3  0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#4  0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fdb9ffff700 (LWP 2691)):
#0  0x00007fdbb4fe8795 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fdba9b4681b in ?? () from /usr/lib64/dri/i965_dri.so
#2  0x00007fdba9b46697 in ?? () from /usr/lib64/dri/i965_dri.so
#3  0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#4  0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fdba8c44700 (LWP 2690)):
#0  0x00007fdbb4fe8795 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fdba9b4681b in ?? () from /usr/lib64/dri/i965_dri.so
#2  0x00007fdba9b46697 in ?? () from /usr/lib64/dri/i965_dri.so
#3  0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#4  0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fdba9445700 (LWP 2689)):
#0  0x00007fdbb4fe8795 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fdba9b4681b in ?? () from /usr/lib64/dri/i965_dri.so
#2  0x00007fdba9b46697 in ?? () from /usr/lib64/dri/i965_dri.so
#3  0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#4  0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fdbab5ef700 (LWP 2674)):
#0  0x00007fdbb57e44fc in read () from /lib64/libc.so.6
#1  0x00007fdbb432d37f in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007fdbb42e5537 in g_main_context_check () from /usr/lib64/libglib-2.0.so.0
#3  0x00007fdbb42e5982 in ?? () from /usr/lib64/libglib-2.0.so.0
#4  0x00007fdbb42e5aff in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#5  0x00007fdbb5d91beb in QEventDispatcherGlib::processEvents (this=0x7fdba0000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007fdbb5d39b7b in QEventLoop::exec (this=this@entry=0x7fdbab5eed80, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#7  0x00007fdbb5b645ce in QThread::exec (this=this@entry=0x55fda7820d20) at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#8  0x00007fdbb74ff6e5 in QQmlThreadPrivate::run (this=0x55fda7820d20) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/qml/ftw/qqmlthread.cpp:155
#9  0x00007fdbb5b65698 in QThreadPrivate::start (arg=0x55fda7820d20) at thread/qthread_unix.cpp:342
#10 0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#11 0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fdbb0afc700 (LWP 2394)):
#0  0x00007fdbb57e8acf in poll () from /lib64/libc.so.6
#1  0x00007fdbb42e59de in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007fdbb42e5aff in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007fdbb5d91beb in QEventDispatcherGlib::processEvents (this=0x7fdba4000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fdbb5d39b7b in QEventLoop::exec (this=this@entry=0x7fdbb0afbd70, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#5  0x00007fdbb5b645ce in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#6  0x00007fdbb6e78507 in ?? () from /usr/lib64/libQt5DBus.so.5
#7  0x00007fdbb5b65698 in QThreadPrivate::start (arg=0x7fdbb6efada0) at thread/qthread_unix.cpp:342
#8  0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#9  0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fdbb1713700 (LWP 2361)):
#0  0x00007fdbb57e8acf in poll () from /lib64/libc.so.6
#1  0x00007fdbb7c9e772 in ?? () from /usr/lib64/libxcb.so.1
#2  0x00007fdbb7c9f43a in xcb_wait_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007fdbb18fcab0 in ?? () from /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007fdbb5b65698 in QThreadPrivate::start (arg=0x55fda75ab480) at thread/qthread_unix.cpp:342
#5  0x00007fdbb4fe1efa in start_thread () from /lib64/libpthread.so.0
#6  0x00007fdbb57f33bf in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fdbb3803800 (LWP 2330)):
[KCrash Handler]
#4  0x00007fdbb78c51d3 in QVector<QQuickItemPrivate::ChangeListener>::indexOf (this=this@entry=0x55fda7545088, t=..., from=from@entry=0) at /usr/include/qt5/QtCore/qvector.h:1008
#5  0x00007fdbb78bd27e in QVector<QQuickItemPrivate::ChangeListener>::removeOne (t=..., this=<optimized out>) at /usr/include/qt5/QtCore/qvector.h:180
#6  QQuickItemPrivate::removeItemChangeListener (this=this@entry=0x55fda7545010, listener=listener@entry=0x55fda9947af0, types=..., types@entry=...) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:3949
#7  0x00007fdbb79fce4b in QQuickShaderEffectSource::~QQuickShaderEffectSource (this=0x55fda9947ad0, __in_chrg=<optimized out>) at /usr/include/qt5/QtCore/qflags.h:118
#8  0x00007fdbb79fceb9 in QQuickShaderEffectSource::~QQuickShaderEffectSource (this=0x55fda9947ad0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickshadereffectsource.cpp:203
#9  0x00007fdb9d86d1c7 in QGfxSourceProxy::~QGfxSourceProxy (this=<optimized out>, this=<optimized out>) at qgfxsourceproxy.cpp:59
#10 0x00007fdb9d873745 in QQmlPrivate::QQmlElement<QGfxSourceProxy>::~QQmlElement (this=<optimized out>, this=<optimized out>) at /usr/include/qt5/QtQml/qqmlprivate.h:109
#11 QQmlPrivate::QQmlElement<QGfxSourceProxy>::~QQmlElement (this=<optimized out>, this=<optimized out>) at /usr/include/qt5/QtQml/qqmlprivate.h:111
#12 0x00007fdbb5d6457e in QObjectPrivate::deleteChildren (this=0x55fda9adf2d0) at kernel/qobject.cpp:2123
#13 0x00007fdbb5d6dbf6 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1107
#14 0x00007fdbb78c1eaa in QQuickItem::~QQuickItem (this=0x55fdaabe1960, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:2443
#15 0x00007fdbb78e47d5 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fdaabe1960, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:109
#16 QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fdaabe1960, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:111
#17 0x00007fdbb5d6457e in QObjectPrivate::deleteChildren (this=0x55fdaabe1660) at kernel/qobject.cpp:2123
#18 0x00007fdbb5d6dbf6 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1107
#19 0x00007fdbb78c1eaa in QQuickItem::~QQuickItem (this=0x55fdaabe15a0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:2443
#20 0x00007fdbb78e47d5 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fdaabe15a0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:109
#21 QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fdaabe15a0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:111
#22 0x00007fdbb5d6457e in QObjectPrivate::deleteChildren (this=0x55fdaabe13a0) at kernel/qobject.cpp:2123
#23 0x00007fdbb5d6dbf6 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1107
#24 0x00007fdbb78c1eaa in QQuickItem::~QQuickItem (this=0x55fdaabe12e0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:2443
#25 0x00007fdbb78e47d5 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fdaabe12e0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:109
#26 QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fdaabe12e0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:111
#27 0x00007fdbb5d6457e in QObjectPrivate::deleteChildren (this=0x55fda9a9ae10) at kernel/qobject.cpp:2123
#28 0x00007fdbb5d6dbf6 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1107
#29 0x00007fdbb78c1eaa in QQuickItem::~QQuickItem (this=0x55fda9a9ad50, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:2443
#30 0x00007fdbb78e49f5 in QQmlPrivate::QQmlElement<QQuickLoader>::~QQmlElement (this=0x55fda9a9ad50, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:109
#31 QQmlPrivate::QQmlElement<QQuickLoader>::~QQmlElement (this=0x55fda9a9ad50, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:111
#32 0x00007fdbb5d6457e in QObjectPrivate::deleteChildren (this=0x55fda9a991c0) at kernel/qobject.cpp:2123
#33 0x00007fdbb5d6dbf6 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1107
#34 0x00007fdbb78c1eaa in QQuickItem::~QQuickItem (this=0x55fda9a93b30, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:2443
#35 0x00007fdbb78e47d5 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fda9a93b30, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:109
#36 QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fda9a93b30, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:111
#37 0x00007fdbb5d6457e in QObjectPrivate::deleteChildren (this=0x55fda9a91390) at kernel/qobject.cpp:2123
#38 0x00007fdbb5d6dbf6 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1107
#39 0x00007fdbb78c1eaa in QQuickItem::~QQuickItem (this=0x55fda9a912d0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:2443
#40 0x00007fdbb78e49f5 in QQmlPrivate::QQmlElement<QQuickLoader>::~QQmlElement (this=0x55fda9a912d0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:109
#41 QQmlPrivate::QQmlElement<QQuickLoader>::~QQmlElement (this=0x55fda9a912d0, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:111
#42 0x00007fdbb5d6457e in QObjectPrivate::deleteChildren (this=0x55fda9a8e150) at kernel/qobject.cpp:2123
#43 0x00007fdbb5d6dbf6 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1107
#44 0x00007fdbb78c1eaa in QQuickItem::~QQuickItem (this=0x55fda9a8e090, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:2443
#45 0x00007fdbb78e47d5 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fda9a8e090, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:109
#46 QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement (this=0x55fda9a8e090, __in_chrg=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/../../src/qml/qml/qqmlprivate.h:111
#47 0x00007fdbb5d6778f in QObject::event (this=this@entry=0x55fda9a8e090, e=e@entry=0x55fda9a94dd0) at kernel/qobject.cpp:1326
#48 0x00007fdbb78bf3d3 in QQuickItem::event (this=0x55fda9a8e090, ev=0x55fda9a94dd0) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/quick/items/qquickitem.cpp:8156
#49 0x00007fdbb689fcaf in QApplicationPrivate::notify_helper (this=this@entry=0x55fda7584730, receiver=receiver@entry=0x55fda9a8e090, e=e@entry=0x55fda9a94dd0) at kernel/qapplication.cpp:3684
#50 0x00007fdbb68a8df0 in QApplication::notify (this=0x7ffc1fd64510, receiver=0x55fda9a8e090, e=0x55fda9a94dd0) at kernel/qapplication.cpp:3430
#51 0x00007fdbb5d3afe2 in QCoreApplication::notifyInternal2 (receiver=0x55fda9a8e090, event=0x55fda9a94dd0) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:153
#52 0x00007fdbb5d3d774 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x55fda757a5a0) at kernel/qcoreapplication.cpp:1832
#53 0x00007fdbb5d92553 in postEventSourceDispatch (s=0x55fda7648410) at kernel/qeventdispatcher_glib.cpp:277
#54 0x00007fdbb42e56e8 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#55 0x00007fdbb42e5a70 in ?? () from /usr/lib64/libglib-2.0.so.0
#56 0x00007fdbb42e5aff in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#57 0x00007fdbb5d91bce in QEventDispatcherGlib::processEvents (this=0x55fda764bda0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#58 0x00007fdbb5d39b7b in QEventLoop::exec (this=this@entry=0x7ffc1fd64340, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#59 0x00007fdbb5d41952 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#60 0x000055fda6247e3c in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma5-workspace-5.18.5-2.1.x86_64/shell/main.cpp:228
[Inferior 1 (process 2330) detached]

The reporter indicates this bug may be a duplicate of or related to bug 421739.

Possible duplicates by query: bug 421739, bug 421737, bug 421727, bug 421724, bug 421701.

Reported using DrKonqi