message: This test is failing on and off on the bots.
  Disable it for now till I can figure out what's going wrong.
diff: # XFAIL: system-netbsd
  # UNSUPPORTED: system-windows
  # This test is flakey and hangs on windows periodically: llvm.org/pr38373
  -# UNSUPPORTED: system-linux
  +# UNSUPPORTED: system-linux, system-darwin
  thread list
  break set -f stop-hook-threads.cpp -p "Set break point at this line"
  