程序运行过程中经常崩在~QBrush里面

Thank you very much for your reply, sir！

I want refresh CPU resource of the current system regularly by a QTimer, and then displayed with a QLabel. If the CPU usage exceeds a certain proportion, the text color of QLabel's stylesheet will be changed.

Application crashed after running for a period of time.

The crash stack is as follows:

Similar crashes have occurred many times. Some of them may not be set stylesheet (), but may be in the process of decomposing a QWidget. What they have in common is that they all crash in qbrush's destructor！