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

Solution Verified - Updated -

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.

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise MRG

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