Getting errors such as " Worker Process *** exited with code: 20" in supervisor log

[Jayant Sharma]

Hi,

We are getting errors such as

 Worker Process 7e76e194-011b-4a66-b25d-a0e9edee055a exited with code: 20
and
  Worker Process 7e76e194-011b-4a66-b25d-a0e9edee055a exited with code: 137


What do these error codes mean? Also, we notice that these errors cause the
workers to be relaunched. Can someone please explain what might be
happening?

Thanks,

Jayant Sharma