Bug 399556

Application: plasma-discover (5.14.0)

Qt Version: 5.11.1
Frameworks Version: 5.50.0
Operating System: Linux 4.15.0-36-lowlatency x86_64
Distribution: KDE neon User Edition 5.14

-- Information about the crash:
- What I was doing when the application crashed:
After update to 5.14.0, settings menu shows nothing but 3 items with title "undefined". Each of them has a disabled checkbox.
When i click on any of them, discover crashes after 2 sec, every time.

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3cb88cec80 (LWP 12468))]

Thread 11 (Thread 0x7f3c69ad4700 (LWP 12482)):
#0  0x00007f3cb3e51bf9 in __GI___poll (fds=0x7f3c5c0020d0, nfds=1, timeout=107942) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f3cae3c1439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3cae3c154c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3cb478ca9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f3c5c000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f3cb4730dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f3c69ad3da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007f3cb455bb8a in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:525
#6  0x00007f3cb4566aab in QThreadPrivate::start(void*) (arg=0x56193f6d3a20) at thread/qthread_unix.cpp:367
#7  0x00007f3cb055c6db in start_thread (arg=0x7f3c69ad4700) at pthread_create.c:463
#8  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f3c6bfff700 (LWP 12479)):
#0  0x00007f3cb3e51bf9 in __GI___poll (fds=0x561942a23d80, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f3cae3c1439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3cae3c17d2 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3c82feef66 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f3cae3e8e85 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f3cb055c6db in start_thread (arg=0x7f3c6bfff700) at pthread_create.c:463
#6  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f3c78dbb700 (LWP 12478)):
#0  0x00007f3cb3e4d0b4 in __GI___libc_read (fd=16, buf=0x7f3c78dbace0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f3cae405a00 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3cae3c0f27 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3cae3c13e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f3cae3c154c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f3cae3c1591 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f3cae3e8e85 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f3cb055c6db in start_thread (arg=0x7f3c78dbb700) at pthread_create.c:463
#8  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f3c7b594700 (LWP 12477)):
#0  0x00007f3cb0562ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f3c7b593c30, expected=0, futex_word=0x7f3c740042f0) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f3cb0562ed9 in __pthread_cond_wait_common (abstime=0x7f3c7b593d00, mutex=0x7f3c740042a0, cond=0x7f3c740042c8) at pthread_cond_wait.c:533
#2  0x00007f3cb0562ed9 in __pthread_cond_timedwait (cond=0x7f3c740042c8, mutex=0x7f3c740042a0, abstime=0x7f3c7b593d00) at pthread_cond_wait.c:667
#3  0x00007f3cb4567850 in QWaitConditionPrivate::wait_relative(unsigned long) (time=30000, this=0x7f3c740042a0) at thread/qwaitcondition_unix.cpp:133
#4  0x00007f3cb4567850 in QWaitConditionPrivate::wait(unsigned long) (time=30000, this=0x7f3c740042a0) at thread/qwaitcondition_unix.cpp:141
#5  0x00007f3cb4567850 in QWaitCondition::wait(QMutex*, unsigned long) (this=this@entry=0x7f3c74003fb0, mutex=mutex@entry=0x7f3c74003d30, time=30000) at thread/qwaitcondition_unix.cpp:215
#6  0x00007f3cb455e25d in QThreadPoolThread::run() (this=0x7f3c74003fa0) at thread/qthreadpool.cpp:146
#7  0x00007f3cb4566aab in QThreadPrivate::start(void*) (arg=0x7f3c74003fa0) at thread/qthread_unix.cpp:367
#8  0x00007f3cb055c6db in start_thread (arg=0x7f3c7b594700) at pthread_create.c:463
#9  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f3c7bd95700 (LWP 12476)):
#0  0x00007f3cae406d94 in g_mutex_unlock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f3cae3c0988 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3cae3c136b in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3cae3c154c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f3cb478ca9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f3c74000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007f3cb4730dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f3c7bd94da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#6  0x00007f3cb455bb8a in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:525
#7  0x00007f3cb4566aab in QThreadPrivate::start(void*) (arg=0x561942a3c4e0) at thread/qthread_unix.cpp:367
#8  0x00007f3cb055c6db in start_thread (arg=0x7f3c7bd95700) at pthread_create.c:463
#9  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f3c81c07700 (LWP 12474)):
#0  0x00007f3cb3e51bf9 in __GI___poll (fds=0x7f3c7c004a10, nfds=1, timeout=9943) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f3cae3c1439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3cae3c154c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3cb478ca9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f3c7c000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f3cb4730dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f3c81c06da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007f3cb455bb8a in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:525
#6  0x00007f3cb4566aab in QThreadPrivate::start(void*) (arg=0x561940c08a40) at thread/qthread_unix.cpp:367
#7  0x00007f3cb055c6db in start_thread (arg=0x7f3c81c07700) at pthread_create.c:463
#8  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f3c8cb49700 (LWP 12473)):
#0  0x00007f3cb3e51bf9 in __GI___poll (fds=0x7f3c88004db0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f3cae3c1439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3cae3c154c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3cb478ca9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f3c88000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f3cb4730dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f3c8cb48d30, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007f3cb455bb8a in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:525
#6  0x00007f3cb7957906 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f3cb4566aab in QThreadPrivate::start(void*) (arg=0x561940a4cee0) at thread/qthread_unix.cpp:367
#8  0x00007f3cb055c6db in start_thread (arg=0x7f3c8cb49700) at pthread_create.c:463
#9  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f3c97fff700 (LWP 12472)):
#0  0x00007f3cb3e51bf9 in __GI___poll (fds=0x7f3c90004a00, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f3cae3c1439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3cae3c154c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3cb478ca9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f3c90000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f3cb4730dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f3c97ffed80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007f3cb455bb8a in QThread::exec() (this=this@entry=0x56193f284a20) at thread/qthread.cpp:525
#6  0x00007f3cb51008b5 in QQmlThreadPrivate::run() (this=0x56193f284a20) at qml/ftw/qqmlthread.cpp:148
#7  0x00007f3cb4566aab in QThreadPrivate::start(void*) (arg=0x56193f284a20) at thread/qthread_unix.cpp:367
#8  0x00007f3cb055c6db in start_thread (arg=0x7f3c97fff700) at pthread_create.c:463
#9  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f3c9d615700 (LWP 12471)):
#0  0x00007f3cae406d94 in g_mutex_unlock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f3cae3c1556 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3cb478ca9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f3c98000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#3  0x00007f3cb4730dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f3c9d614d70, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#4  0x00007f3cb455bb8a in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:525
#5  0x00007f3cb6459e45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007f3cb4566aab in QThreadPrivate::start(void*) (arg=0x7f3cb66d1d60) at thread/qthread_unix.cpp:367
#7  0x00007f3cb055c6db in start_thread (arg=0x7f3c9d615700) at pthread_create.c:463
#8  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f3ca5cfe700 (LWP 12470)):
#0  0x00007f3cb3e51bf9 in __GI___poll (fds=0x7f3ca5cfdca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f3cae158747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f3cae15a36a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f3ca8cbf129 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f3cb4566aab in QThreadPrivate::start(void*) (arg=0x56193f1a1400) at thread/qthread_unix.cpp:367
#5  0x00007f3cb055c6db in start_thread (arg=0x7f3ca5cfe700) at pthread_create.c:463
#6  0x00007f3cb3e5e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f3cb88cec80 (LWP 12468)):
[KCrash Handler]
#6  0x00007f3c9fd62e7c in QQuickMenuPrivate::setParentMenu(QQuickMenu*) () at /usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
#7  0x00007f3c9fd645cb in QQuickMenuPrivate::removeItem(int, QQuickItem*) () at /usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
#8  0x00007f3cb7a17d26 in QQuickItemPrivate::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f3cb7a1e157 in QQuickItem::setParentItem(QQuickItem*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007f3cb7a1fa6c in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f3cb7a1fd59 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007f3cb475f6ab in QObjectPrivate::deleteChildren() (this=this@entry=0x561943205a00) at kernel/qobject.cpp:1997
#13 0x00007f3cb476914b in QObject::~QObject() (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1025
#14 0x00007f3cb7a1fb7b in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007f3cb7a3ce15 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007f3cb475f6ab in QObjectPrivate::deleteChildren() (this=this@entry=0x561942d01990) at kernel/qobject.cpp:1997
#17 0x00007f3cb476914b in QObject::~QObject() (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1025
#18 0x00007f3c9483c25d in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#19 0x00007f3cb475f6ab in QObjectPrivate::deleteChildren() (this=this@entry=0x561942feee80) at kernel/qobject.cpp:1997
#20 0x00007f3cb476914b in QObject::~QObject() (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1025
#21 0x00007f3cb7a1fb7b in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#22 0x00007f3cb7a3d065 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#23 0x00007f3cb475f6ab in QObjectPrivate::deleteChildren() (this=this@entry=0x56194617ca60) at kernel/qobject.cpp:1997
#24 0x00007f3cb476914b in QObject::~QObject() (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1025
#25 0x00007f3cb7a1fb7b in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#26 0x00007f3cb7a3c6c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#27 0x00007f3cb4762660 in QObject::event(QEvent*) (this=0x561943628db0, e=<optimized out>) at kernel/qobject.cpp:1242
#28 0x00007f3cb7a1caeb in QQuickItem::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#29 0x00007f3cb5d49e8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x56193f1a7520, receiver=receiver@entry=0x561943628db0, e=e@entry=0x561942b45720) at kernel/qapplication.cpp:3727
#30 0x00007f3cb5d5145f in QApplication::notify(QObject*, QEvent*) (this=0x7ffd4ebe17a0, receiver=0x561943628db0, e=0x561942b45720) at kernel/qapplication.cpp:3486
#31 0x00007f3cb4732ab8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x561943628db0, event=event@entry=0x561942b45720) at kernel/qcoreapplication.cpp:1048
#32 0x00007f3cb47355fd in QCoreApplication::sendEvent(QObject*, QEvent*) (event=0x561942b45720, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#33 0x00007f3cb47355fd in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x56193f1a6f30) at kernel/qcoreapplication.cpp:1745
#34 0x00007f3cb4735bb8 in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1599
#35 0x00007f3cb478d453 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=0x56193f200620) at kernel/qeventdispatcher_glib.cpp:276
#36 0x00007f3cae3c1287 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007f3cae3c14c0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f3cae3c154c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007f3cb478ca7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x56193f207aa0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#40 0x00007f3ca8d49ed1 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#41 0x00007f3cb4730dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffd4ebe16e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#42 0x00007f3cb4739fa0 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1336
#43 0x000056193d8dc808 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at ./discover/main.cpp:156

Possible duplicates by query: bug 399555, bug 399005, bug 398003, bug 397997, bug 397955.

Reported using DrKonqi