While I was debugging a process in QtCreator I was pressing F10 (Step Over) to follow execution of a function. At some point QtCreator hung, UI unresponsive and 2 CPU cores loaded 100%. I saved a backtrace while QtCreator was hanging. I think this may be related to C++ code model as the backtrace shows 2 threads deep in the code model plugin. It is possible the the hang is caused by some UI action, like hovering mouse pointer over some symbol, and not the debugging process.