Application: spectacle (19.08.1)

Qt Version: 5.11.3
Frameworks Version: 5.62.0
Operating System: Linux 5.2.0-3-amd64 x86_64
Distribution: Debian GNU/Linux bullseye/sid

-- Information about the crash:
- What I was doing when the application crashed:
App works fine except when I try to select a rectangle (partial screen area), then it crashes everytime.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Spectacle (spectacle), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fbdc306c800 (LWP 3008))]

Thread 4 (Thread 0x7fbdba1e4700 (LWP 3011)):
#0  0x00007fbdc632ddb5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fbdbaa0b30b in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#2  0x00007fbdbaa0af27 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#3  0x00007fbdc6327fb7 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007fbdc753f2ef in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 3 (Thread 0x7fbdc0ddf700 (LWP 3010)):
#0  0x00007fbdc75308bc in read () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fbdc578ccef in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbdc5745bee in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbdc5746042 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fbdc57461bf in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fbdc7a9b3e3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbdc7a48cfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbdc7898d8e in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbdc827b545 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007fbdc78a2a07 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fbdc6327fb7 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007fbdc753f2ef in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 2 (Thread 0x7fbdc24a0700 (LWP 3009)):
#0  0x00007fbdc754061d in recvmsg () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fbdc8f99e58 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fbdc8f97fb5 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fbdc8f9991a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#4  0x00007fbdc2c2cd79 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#5  0x00007fbdc78a2a07 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbdc6327fb7 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#7  0x00007fbdc753f2ef in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 1 (Thread 0x7fbdc306c800 (LWP 3008)):
[KCrash Handler]
#6  0x00007fbdc85b3743 in QWidget::window() const () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00007fbdc8594557 in QApplicationPrivate::sendSyntheticEnterLeave(QWidget*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007fbdc85c63cf in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007fbdc85c63a1 in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007fbdc85cc2b2 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007fbdc858d501 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007fbdc85949b0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007fbdc7a4a029 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fbdc85e8344 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007fbdc85e8a52 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007fbdc858d501 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fbdc85949b0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fbdc7a4a029 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fbdc7df1701 in QGuiApplicationPrivate::processWindowStateChangedEvent(QWindowSystemInterfacePrivate::WindowStateChangedEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#20 0x00007fbdc7df6f4d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#21 0x00007fbdc7dd106b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#22 0x00007fbdc2cc339b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#23 0x00007fbdc7a48cfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fbdc7a50cd2 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00005571ca73a948 in ?? ()
#26 0x00007fbdc746bbbb in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#27 0x00005571ca73b38a in ?? ()
[Inferior 1 (process 3008) detached]

Reported using DrKonqi