Application: plasmashell (5.9.5)

Qt Version: 5.7.1
Frameworks Version: 5.31.0
Operating System: Linux 4.10.0-35-generic x86_64
Distribution: Ubuntu 17.04

-- Information about the crash:
- What I was doing when the application crashed:
Plasma always crashed when I'm closing Lazarus  1.6.4
Lazarus works good, this issue becomes just in the moment at closing Lazarus.

The crash can be reproduced every time.

-- 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 0x7f695adb5d40 (LWP 1610))]

Thread 17 (Thread 0x7f6847fff700 (LWP 4314)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6955081aeb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6958b36495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f6958b36d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f6847fff700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 16 (Thread 0x7f68724fe700 (LWP 2872)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6955081aeb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6958b36495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f6958b36d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f68724fe700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 15 (Thread 0x7f684ffff700 (LWP 2621)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6955081aeb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6958b36495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f6958b36d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f684ffff700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 14 (Thread 0x7f6870f3e700 (LWP 2224)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6955081aeb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6958b36495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f6958b36d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f6870f3e700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 13 (Thread 0x7f6871bfd700 (LWP 2135)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6955081aeb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6958b36495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f6958b36d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f6871bfd700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7f6872ddb700 (LWP 2120)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6955081aeb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6958b36495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f6958b36d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f6872ddb700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7f6874519700 (LWP 2055)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6955081aeb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6958b36495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f6958b36d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f6874519700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7f687da72700 (LWP 2048)):
#0  0x00007f69552a395b in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f694f5a0a6d in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f694f5a149b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f694f5a168c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f69552a40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f695524dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f695507bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f687e1375c7 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f6953f236da in start_thread (arg=0x7f687da72700) at pthread_create.c:456
#10 0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7f6897815700 (LWP 2005)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f6955081aeb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6958b36495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f6958b36d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f6897815700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7f689cb85700 (LWP 1998)):
#0  0x00007f694f5a169d in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f69552a40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f695524dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f695507bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6958ac74c6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6953f236da in start_thread (arg=0x7f689cb85700) at pthread_create.c:456
#7  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7f692bde9700 (LWP 1905)):
#0  0x00007f6953f29510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f695a7312c4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f695a731309 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f6953f236da in start_thread (arg=0x7f692bde9700) at pthread_create.c:456
#4  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7f6931d09700 (LWP 1805)):
#0  0x00007f6954981d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f694f5a1576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f694f5a168c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f69552a40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f695524dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f695507bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f6953f236da in start_thread (arg=0x7f6931d09700) at pthread_create.c:456
#8  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7f69337a1700 (LWP 1800)):
#0  0x00007f6954981d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f694f5a1576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f694f5a168c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f69552a40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f695524dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f695507bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6957f40df5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f6953f236da in start_thread (arg=0x7f69337a1700) at pthread_create.c:456
#9  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7f693d76e700 (LWP 1677)):
#0  0x00007f695497d8ad in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f694f5e5b30 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f694f5a1042 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f694f5a1514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f694f5a168c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f69552a40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f695524dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f695507bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f6957f40df5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f6953f236da in start_thread (arg=0x7f693d76e700) at pthread_create.c:456
#11 0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7f6944bf0700 (LWP 1625)):
#0  0x00007f6954981d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f695968dc62 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f695968f8d7 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f6947368ef9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6953f236da in start_thread (arg=0x7f6944bf0700) at pthread_create.c:456
#6  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f6948494700 (LWP 1619)):
#0  0x00007f6954981d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f694f5a1576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f694f5a168c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f69552a40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f695524dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f695507bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f69556b65d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f6955080c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f6953f236da in start_thread (arg=0x7f6948494700) at pthread_create.c:456
#9  0x00007f695498dd7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f695adb5d40 (LWP 1610)):
[KCrash Handler]
#6  0x00007f6955216240 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f6955216529 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f695521e429 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f695527b789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f69552f2784 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f69551f762b in QAbstractItemModel::endRemoveRows() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f688c3385e8 in  () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.6
#13 0x00007f688c33b5e9 in  () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.6
#14 0x00007f695527b789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f69552f2714 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f69551f6ed3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f695521bc05 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f695521be04 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f695521e408 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f695527b789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f69552f2714 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f69551f6ed3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f688f72ad95 in  () at /usr/lib/x86_64-linux-gnu/libKF5ItemModels.so.5
#24 0x00007f688f72c331 in  () at /usr/lib/x86_64-linux-gnu/libKF5ItemModels.so.5
#25 0x00007f695527b789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f69552f2714 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f69551f6ed3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f6955211460 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007f695527b789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007f69552f2714 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f69551f6ed3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f688c352528 in TaskManager::XWindowTasksModel::Private::removeWindow(unsigned long long) () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.6
#33 0x00007f695527bafe in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007f6957a5eff2 in KWindowSystem::windowRemoved(unsigned long long) () at /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#35 0x00007f693db8e2e6 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#36 0x00007f6957a57342 in NETRootInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) () at /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#37 0x00007f6957a5836c in NETRootInfo::event(xcb_generic_event_t*, QFlags<NET::Property>*, QFlags<NET::Property2>*) () at /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#38 0x00007f6957a58692 in NETRootInfo::event(xcb_generic_event_t*, unsigned long*, int) () at /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#39 0x00007f693db8da16 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#40 0x00007f695524cd2f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#41 0x00007f694736a694 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#42 0x00007f694736b375 in QXcbConnection::processXcbEvents() () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#43 0x00007f695527c639 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#44 0x00007f69561b135c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#45 0x00007f69561b8b21 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#46 0x00007f695524fc00 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#47 0x00007f695525239d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#48 0x00007f69552a3c93 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#49 0x00007f694f5a1377 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#50 0x00007f694f5a15e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#51 0x00007f694f5a168c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#52 0x00007f69552a409f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#53 0x00007f695524dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#54 0x00007f695525633c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#55 0x00005624fce220bf in  ()
#56 0x00007f69548a53f1 in __libc_start_main (main=0x5624fce21560, argc=1, argv=0x7ffe7a792b28, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe7a792b18) at ../csu/libc-start.c:291
#57 0x00005624fce2243a in _start ()

Reported using DrKonqi