The PR at https://www.rtems.org/bugzilla/show_bug.cgi?id=2068 describes a bug and provides patches against the 4.9 and 4.10 release branches.

Attempt to apply the patches for 4.9 and 4.10 against those release branches (they are available as git branches from the primary rtems.git, ask if you need help.) If the patches don't apply cleanly, investigate why and provide new patches that do work. Attempt to apply the patch from 4.10 against the current git HEAD. if it does not apply cleanly, create a patch with the same fix that does apply and post the patch here and on the Bugzilla. Write a brief report about your findings as a plaintext .txt flie, and make a comment on the Bugzilla about your findings.