The PR and discussion at https://www.rtems.org/bugzilla/show_bug.cgi?id=1731 gives a detailed analysis and possible fix for a potential bug in how pthread_join() is implemented in RTEMS. Read the bugzilla conversation and investigate this bug to see whether the proposed solution works. If there is no test case for the condition (pthread_join on a terminated thread), implement a test case in psxtests and submit it here and to the Bugzilla. Write a brief report describing what you discovered and upload it here as a plaintext .txt file. You may also like to make a comment on the Bugzilla post about your research.