Thanks for your reply.
I am unable to reproduce the issue consistently. But I did reproduced it once. I will dig more and come up with the steps if I can.
Actually, when the thread 179790 is created, I wondered how it was created, as I haven't created it. So, I have removed that one after a while. As you would like to track it separately, I have created the same thread again. The thread id is #179811.