Segmentation fault when saving axis settings after loading a Layout config

[ClemensVolk]

Problem description

When saving axis values for plots, the program crashes with a segmentation fault.
[Edit:] This happens only after a layout configuration file has been loaded.

Steps to reproduce

• [Ubuntu 20.04.3 LTS (Focal Fossa)]
• ROS 2 Foxy Fitzroy

Subscribe to a ros2 topic and change the y-axis to take on fixed values instead of changing with the incoming data points.
[Edit]: Load a previously saved layout configuration file that displays a ros2 topic. The y-axis in this configuration is variable. Now try to change the axis settings to take on a fixed MIN and MAX value.

Right click on plot->first option->right bottom corner of the dialog. Select "Max" and "Min". Either type in own values or use the provided button for setting default ones. Then save the changes. It then segfaults with the following output:

Stack trace (most recent call last):
#31   Object "/usr/lib/x86_64-linux-gnu/libQt5Core.so.5", at 0x7f3daf657434, in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
#30   Object "/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0", at 0x7f3dae5ce4a2, in g_main_context_iteration
#29   Object "/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0", at 0x7f3dae5ce3ff, in g_main_context_dispatch
#28   Object "/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0", at 0x7f3dae5ce17c, in g_main_context_dispatch
#27   Object "/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5", at 0x7f3dab7e232d, in QXcbNativeInterface::dumpNativeWindows(unsigned long long) const
#26   Object "/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5", at 0x7f3daf9c435a, in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
#25   Object "/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5", at 0x7f3daf9ea10a, in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
#24   Object "/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5", at 0x7f3daf9e87d2, in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
#23   Object "/usr/lib/x86_64-linux-gnu/libQt5Core.so.5", at 0x7f3daf5ff809, in QCoreApplication::notifyInternal2(QObject*, QEvent*)
#22   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db00210ef, in QApplication::notify(QObject*, QEvent*)
#21   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db0017a65, in QApplicationPrivate::notify_helper(QObject*, QEvent*)
#20   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db00791eb, in QDesktopWidget::qt_metacall(QMetaObject::Call, int, void**)
#19   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db007635c, in QDesktopWidget::qt_metacall(QMetaObject::Call, int, void**)
#18   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db0020456, in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool)
#17   Object "/usr/lib/x86_64-linux-gnu/libQt5Core.so.5", at 0x7f3daf5ff809, in QCoreApplication::notifyInternal2(QObject*, QEvent*)
#16   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db0021342, in QApplication::notify(QObject*, QEvent*)
#15   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db0017a65, in QApplicationPrivate::notify_helper(QObject*, QEvent*)
#14   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db005a2d0, in QWidget::event(QEvent*)
#13   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db010d254, in QAbstractButton::mousePressEvent(QMouseEvent*)
#12   Object "/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5", at 0x7f3db010cb00, in QAbstractButton::toggled(bool)
#11   Object "/usr/lib/x86_64-linux-gnu/libQt5Core.so.5", at 0x7f3daf62b28b, in QMetaObject::activate(QObject*, int, int, void**)
#10   Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf3c055f, in 
#9    Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf3bdc0c, in 
#8    Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf42da64, in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
#7    Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf42b0f1, in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
#6    Object "/usr/lib/x86_64-linux-gnu/libQt5Core.so.5", at 0x7f3daf62b327, in QMetaObject::activate(QObject*, int, int, void**)
#5    Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf3e25e2, in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag)
#4    Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf3e25ad, in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag)
#3    Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf3bd981, in 
#2    Object "/usr/lib/x86_64-linux-gnu/libQt5Core.so.5", at 0x7f3daf62b1cf, in QMetaObject::activate(QObject*, int, int, void**)
#1    Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf3be39c, in 
#0    Object "/opt/ros/foxy/lib/plotjuggler/plotjuggler", at 0x55dccf422780, in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
Segmentation fault (Address not mapped to object [0x30])

[facontidavide]

I am not able to replicate this on master. It could be that the problem has been fixed already.
Which version of PlotJuggler are you using?

[facontidavide]

closing for inactivity. If you can reproduce on main branch, let me know