构造函数中大小为 4 的写入无效

我正在使用Qt5。在我正在编写的程序中，我有一个带有非常简单构造函数的类。问题是，当我检查Valgrind的问题时，我在每次作业中都会收到"无效的大小写入"。

这是标头：

#ifndef RS22812_H
#define RS22812_H
#include <QObject>
class RS22812 : public QObject
{
    Q_OBJECT
public:
    explicit RS22812(QObject *parent = 0);
    ~RS22812();
private:
    uint mode;
    Flags flags;
    QString byte2Digit(uchar byte);
signals:
    void modeChanged(uint newmode);
public slots:
    void newValue(const QByteArray &data);
};
#endif // RS22812_H

以及 cpp 文件中的构造函数定义：

RS22812::RS22812(QObject *parent) : QObject(parent)
{
    mode=0;
}

Valgrind 在 QObject(parent( 和 mode=0 上都给了我错误：

Invalid write of size 4
  in RS22812::RS22812(QObject*) in /home/javi/ProgrammingProjects/multimeterGUI/rs22812.cpp:4
  1: RS22812::RS22812(QObject*) in /home/javi/ProgrammingProjects/multimeterGUI/rs22812.cpp:4
  2: MainWindow::MainWindow(QWidget*) in /home/javi/ProgrammingProjects/multimeterGUI/mainwindow.cpp:29
  3: main in /home/javi/ProgrammingProjects/multimeterGUI/main.cpp:7
Address 0x1c4ad500 is 0 bytes after a block of size 16 alloc'd  1: operator new(unsigned long) in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
  2: MainWindow::MainWindow(QWidget*) in /home/javi/ProgrammingProjects/multimeterGUI/mainwindow.cpp:29
  3: main in /home/javi/ProgrammingProjects/multimeterGUI/main.cpp:7
Invalid write of size 4
  in RS22812::RS22812(QObject*) in /home/javi/ProgrammingProjects/multimeterGUI/rs22812.cpp:6
  1: RS22812::RS22812(QObject*) in /home/javi/ProgrammingProjects/multimeterGUI/rs22812.cpp:6
  2: MainWindow::MainWindow(QWidget*) in /home/javi/ProgrammingProjects/multimeterGUI/mainwindow.cpp:29
  3: main in /home/javi/ProgrammingProjects/multimeterGUI/main.cpp:7
Address 0x1c4ad500 is 0 bytes after a block of size 16 alloc'd  1: operator new(unsigned long) in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
  2: MainWindow::MainWindow(QWidget*) in /home/javi/ProgrammingProjects/multimeterGUI/mainwindow.cpp:29
  3: main in /home/javi/ProgrammingProjects/multimeterGUI/main.cpp:7

我不明白这么简单的作业怎么会导致错误。感谢您的建议。