Why does the system seem unresponsive when running a process at real-time priority?

Issue

• Running the following command, causes the system to become unresponsive

# taskset -c 1 chrt -f 40 ./test_prog

Note: The following is a sample "test_prog" program

int
main(int argc,char * argv[])
{
  while(1) {}
  return(0);
}

• Server was hung, RCA required.
• We have "freeze" on the server and have a vmcore, need help to identify the root cause of this crash.