Running jtreg on hotspot produces warnings about a missing file:

  hs-gc/hotspot/test/TEST.groups: group needs_cmsgc: file not found: gc/class_unloading/TestCMSClassUnloadingDisabledHWM.java

The TEST.groups file was changed to add that file to the needs_cmsgc list in revision hs-gc revision 6671, but that file seems to be missing from that commit.