Program has three threads, the main thread, ThreadA, ThreadB, debugging code in the main thread is allowed, but in the ThreadA ThreadB set breakpoint is invalid, just enter the GDB will crash, as shown in figure

The following code is to create a thread
PClassA=new ClassA;
PClassB=new ClassB;
PThreadA=new QThread ();
PThreadB=new QThread ();
PClassA - & gt; MoveToThread (pThreadA);
PClassB - & gt; MoveToThread (pThreadB);