Application: plasma-systemmonitor (5.21.5)

Qt Version: 5.15.2
Frameworks Version: 5.82.0
Operating System: Linux 5.4.0-73-generic x86_64
Windowing System: X11
Drkonqi Version: 5.21.5
Distribution: KDE neon User Edition 5.21

-- Information about the crash:
- What I was doing when the application crashed:
Just closed the system monitor and this kwin crash error occured . Also, I opened the download widget window , when it closed the kwin crash again raised and I can't even close the window. It also happens if I changed my virtual desktops. 
- Unusual behavior I noticed:
Latte-dock restarts

The crash can be reproduced sometimes.

-- Backtrace:
Application: System Monitor (plasma-systemmonitor), signal: Segmentation fault

[New LWP 20117]
[New LWP 20118]
[New LWP 20120]
[New LWP 20121]
[New LWP 20122]
[New LWP 20123]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007fc3beefeaff in __GI___poll (fds=0x7ffc95ac28a8, nfds=1, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
[Current thread is 1 (Thread 0x7fc3bbba3340 (LWP 20115))]

Thread 7 (Thread 0x7fc3a1e5a700 (LWP 20123)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56255238ed08) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56255238ecb8, cond=0x56255238ece0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56255238ece0, mutex=0x56255238ecb8) at pthread_cond_wait.c:647
#3  0x00007fc3b0531b5b in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007fc3b053175b in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007fc3bebfd609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fc3bef0b293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fc3a265b700 (LWP 20122)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56255238ed08) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56255238ecb8, cond=0x56255238ece0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56255238ece0, mutex=0x56255238ecb8) at pthread_cond_wait.c:647
#3  0x00007fc3b0531b5b in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007fc3b053175b in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007fc3bebfd609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fc3bef0b293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fc39a65b700 (LWP 20121)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56255238ed08) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56255238ecb8, cond=0x56255238ece0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56255238ece0, mutex=0x56255238ecb8) at pthread_cond_wait.c:647
#3  0x00007fc3b0531b5b in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007fc3b053175b in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007fc3bebfd609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fc3bef0b293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fc3a2e5c700 (LWP 20120)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56255238ed08) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56255238ecb8, cond=0x56255238ece0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56255238ece0, mutex=0x56255238ecb8) at pthread_cond_wait.c:647
#3  0x00007fc3b0531b5b in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007fc3b053175b in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007fc3bebfd609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fc3bef0b293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fc3b8e6c700 (LWP 20118)):
#0  0x00007fc3beefeaff in __GI___poll (fds=0x7fc3ac004e60, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc3bde0936e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc3bde094a3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc3bf4c9ffb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc3bf46e1eb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc3bf288a52 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc3bf72bf4b in ?? () from /lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fc3bf289bec in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc3bebfd609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007fc3bef0b293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fc3baf20700 (LWP 20117)):
#0  0x00007fc3beefeaff in __GI___poll (fds=0x7fc3baf1fc68, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc3bdbd3c1a in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fc3bdbd590a in xcb_wait_for_event () from /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fc3bb513d58 in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fc3bf289bec in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc3bebfd609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fc3bef0b293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fc3bbba3340 (LWP 20115)):
[KCrash Handler]
#4  0x00007fc3b99fa81f in QQuickItem::setVisible(bool) () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc3b28f9bda in ToolBarLayoutDelegate::ensureItemVisibility (this=0x5625544244e0) at ./src/toolbarlayoutdelegate.h:87
#6  0x00007fc3bf4a66fe in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc3b9a02c9c in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fc3b9a08c6d in QQuickItem::setParentItem(QQuickItem*) () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007fc3b9a09b0c in QQuickItem::~QQuickItem() () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fc3b1fb1602 in QQuickButton::~QQuickButton (this=0x5625541faea0, __in_chrg=<optimized out>) at ../../../include/QtQuickTemplates2/5.15.2/QtQuickTemplates2/private/../../../../../src/quicktemplates2/qquickbutton_p.h:57
#11 QQuickToolButton::~QQuickToolButton (this=0x5625541faea0, __in_chrg=<optimized out>) at ../../../include/QtQuickTemplates2/5.15.2/QtQuickTemplates2/private/../../../../../src/quicktemplates2/qquicktoolbutton_p.h:55
#12 QQmlPrivate::QQmlElement<QQuickToolButton>::~QQmlElement (this=0x5625541faea0, __in_chrg=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtQml/qqmlprivate.h:144
#13 QQmlPrivate::QQmlElement<QQuickToolButton>::~QQmlElement (this=0x5625541faea0, __in_chrg=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtQml/qqmlprivate.h:144
#14 0x00007fc3b28f87fe in ToolBarLayoutDelegate::~ToolBarLayoutDelegate (this=0x5625544244e0, __in_chrg=<optimized out>) at ./src/toolbarlayoutdelegate.cpp:84
#15 0x00007fc3b28f881d in ToolBarLayoutDelegate::~ToolBarLayoutDelegate (this=0x5625544244e0, __in_chrg=<optimized out>) at ./src/toolbarlayoutdelegate.cpp:70
#16 0x00007fc3b28f50f3 in std::default_delete<ToolBarLayoutDelegate>::operator() (this=0x562554374200, __ptr=<optimized out>) at /usr/include/c++/9/bits/unique_ptr.h:75
#17 std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> >::~unique_ptr (this=0x562554374200, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/unique_ptr.h:292
#18 std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > >::~pair (this=0x5625543741f8, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/stl_pair.h:208
#19 __gnu_cxx::new_allocator<std::__detail::_Hash_node<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > >, false> >::destroy<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > > > (this=<optimized out>, __p=0x5625543741f8) at /usr/include/c++/9/ext/new_allocator.h:153
#20 std::allocator_traits<std::allocator<std::__detail::_Hash_node<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > >, false> > >::destroy<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > > > (__a=..., __p=0x5625543741f8) at /usr/include/c++/9/bits/alloc_traits.h:497
#21 std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > >, false> > >::_M_deallocate_node (__n=0x5625543741f0, this=<optimized out>) at /usr/include/c++/9/bits/hashtable_policy.h:2102
#22 0x00007fc3b28f7ed7 in std::_Hashtable<QObject*, std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > >, std::allocator<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > > >, std::__detail::_Select1st, std::equal_to<QObject*>, std::hash<QObject*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::_M_erase (this=this@entry=0x5625530f9f68, __bkt=<optimized out>, __prev_n=<optimized out>, __n=<optimized out>) at /usr/include/c++/9/bits/hashtable_policy.h:340
#23 0x00007fc3b28f695b in std::_Hashtable<QObject*, std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > >, std::allocator<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > > >, std::__detail::_Select1st, std::equal_to<QObject*>, std::hash<QObject*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::erase (__it=..., this=0x5625530f9f68) at /usr/include/c++/9/bits/hashtable.h:1621
#24 std::_Hashtable<QObject*, std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > >, std::allocator<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > > >, std::__detail::_Select1st, std::equal_to<QObject*>, std::hash<QObject*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::erase (__it=..., this=0x5625530f9f68) at /usr/include/c++/9/bits/hashtable.h:768
#25 std::unordered_map<QObject*, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> >, std::hash<QObject*>, std::equal_to<QObject*>, std::allocator<std::pair<QObject* const, std::unique_ptr<ToolBarLayoutDelegate, std::default_delete<ToolBarLayoutDelegate> > > > >::erase (__position=..., this=0x5625530f9f68) at /usr/include/c++/9/bits/unordered_map.h:798
#26 ToolBarLayout::<lambda(QObject*)>::operator() (__closure=0x562553ea8da0, action=0x562553a58940) at ./src/toolbarlayout.cpp:123
#27 QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<QObject*>, void, ToolBarLayout::addAction(QObject*)::<lambda(QObject*)> >::call (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:146
#28 QtPrivate::Functor<ToolBarLayout::addAction(QObject*)::<lambda(QObject*)>, 1>::call<QtPrivate::List<QObject*>, void> (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:256
#29 QtPrivate::QFunctorSlotObject<ToolBarLayout::addAction(QObject*)::<lambda(QObject*)>, 1, QtPrivate::List<QObject*>, void>::impl (which=1, r=<optimized out>, ret=<optimized out>, a=<optimized out>, this_=0x562553ea8d90) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:443
#30 QtPrivate::QFunctorSlotObject<ToolBarLayout::addAction(QObject*)::<lambda(QObject*)>, 1, QtPrivate::List<QObject*>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=0x562553ea8d90, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:436
#31 0x00007fc3bf4a66fe in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007fc3bf49fb83 in QObject::destroyed(QObject*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007fc3bf4a4955 in QObject::~QObject() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007fc3b1fb597f in QQmlPrivate::QQmlElement<QQuickAction>::~QQmlElement (this=0x562553a58940, __in_chrg=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtQml/qqmlprivate.h:142
#35 QQmlPrivate::QQmlElement<QQuickAction>::~QQmlElement (this=0x562553a58940, __in_chrg=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtQml/qqmlprivate.h:144
#36 0x00007fc3bf499cfe in QObjectPrivate::deleteChildren() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007fc3bf4a4726 in QObject::~QObject() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007fc3b9a09c2a in QQuickItem::~QQuickItem() () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#39 0x00007fc3a0a3aa49 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/ksysguard/faces/libFacesPlugin.so
#40 0x00007fc3bf499cfe in QObjectPrivate::deleteChildren() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#41 0x00007fc3bf4a4726 in QObject::~QObject() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#42 0x00007fc3b26edc4a in KSysGuard::SensorFaceController::~SensorFaceController() () from /lib/x86_64-linux-gnu/libKSysGuardSensorFaces.so.1
#43 0x00007fc3b26edd6d in KSysGuard::SensorFaceController::~SensorFaceController() () from /lib/x86_64-linux-gnu/libKSysGuardSensorFaces.so.1
#44 0x00007fc3bf499cfe in QObjectPrivate::deleteChildren() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#45 0x00007fc3bf4a4726 in QObject::~QObject() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#46 0x00007fc3c0a78d64 in QQmlEngine::~QQmlEngine() () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#47 0x0000562550d7f068 in main (argc=<optimized out>, argv=<optimized out>) at ./src/main.cpp:133
[Inferior 1 (process 20115) detached]

Reported using DrKonqi