Minimum for segfault on linux

main.cpp

#include <QtWidgets/QApplication>
#include "main_window.h"
#include <string>
#include <iostream>

int main(int argc, char **argv)
{
    QApplication app (argc, argv);
 
    main_window window;
    window.setWindowFlags(Qt::Window); // spawn its own window
    window.show();
 
    try {
        return app.exec();
    } catch(const std::string & e) {
        std::cerr << "EXCEPTION: " << e << "\n";
        return 1;
    }
}

main_window.cpp

#include "main_window.h"
#include <QCamera>
#include <QWebView>

main_window::main_window(QWidget* parent):
    QWidget(parent)
{
    QWebView* view = new QWebView(this);
    QCamera* camera = new QCamera(this);
}

main_window::~main_window()
{
    
}

main_window.h

#pragma once
#include <QtWidgets/QWidget>
#include <string>

class main_window : public QWidget
{
    Q_OBJECT
  public:
    explicit main_window(QWidget* parent = nullptr);
    virtual ~main_window();

  private:

  signals:
        
  public slots:
};

segfault.pro

TEMPLATE = app
TARGET = segfault
CONFIG += c++14
CONFIG += console
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.9

QT += multimedia multimediawidgets core gui widgets network webkit webkitwidgets
macx {
LIBS += -liconv
}

HEADERS = \
src/main_window.h \

SOURCES = \
src/main.cpp \
src/main_window.cpp \

Segfault:

$ ./segfault 

(segfault:5998): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(segfault:5998): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(segfault:5998): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(segfault:5998): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(segfault:5998): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(segfault:5998): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(segfault:5998): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'object != NULL' failed

(segfault:5998): GStreamer-CRITICAL **: gst_element_get_bus: assertion 'GST_IS_ELEMENT (element)' failed

(segfault:5998): GStreamer-CRITICAL **: gst_bus_add_watch_full: assertion 'GST_IS_BUS (bus)' failed

(segfault:5998): GStreamer-CRITICAL **: gst_bus_set_sync_handler: assertion 'GST_IS_BUS (bus)' failed

(segfault:5998): GStreamer-CRITICAL **: gst_object_ref: assertion 'object != NULL' failed
Segmentation fault (core dumped)

backtrace:

(gdb) backtrace
#0  0x00007fffdbc15bbc in gst_caps_unref () from /usr/lib/libgstreamer-0.10.so.0
#1  0x00007fffdc52faed in QGstCodecsInfo::QGstCodecsInfo(QGstCodecsInfo::ElementType) () from /usr/lib/libqgsttools_p.so.1
#2  0x00007fffdc55b742 in ?? () from /usr/lib/qt/plugins/mediaservice/libgstcamerabin.so
#3  0x00007fffdc5549dd in ?? () from /usr/lib/qt/plugins/mediaservice/libgstcamerabin.so
#4  0x00007fffdc553f1f in ?? () from /usr/lib/qt/plugins/mediaservice/libgstcamerabin.so
#5  0x00007fffdc553580 in ?? () from /usr/lib/qt/plugins/mediaservice/libgstcamerabin.so
#6  0x00007ffff7f2ecd6 in ?? () from /usr/lib/libQt5Multimedia.so.5
#7  0x00007ffff7f52240 in QCamera::QCamera(QObject*) () from /usr/lib/libQt5Multimedia.so.5
#8  0x0000000000402bf6 in main_window::main_window(QWidget*) ()
#9  0x00000000004029d5 in main ()