Greetings Yodying,
I have escalated this case internally to our Dev-analyses team today. I might get an update tomorrow on this issue.
But taking a look at the attached core files, looks the nstraceaggretor, httpd is causing high CPU this time.
Could you please check and confirm if there was nstrace running and was not stopped? also could you confirm if the trace is running what is CPU usage? Does it go 100% ?