test/jtreg-ext/requires/VMProps.java

*** 574,11 ***
          // check -XX flags
          var ignoredXXFlags = Set.of(
                  // added by run-test framework
                  "MaxRAMPercentage",
                  // added by test environment
!                 "CreateCoredumpOnCrash"
          );
          result &= allFlags.stream()
                            .filter(s -> s.startsWith("-XX:"))
                            // map to names:
                                // remove -XX:
--- 574,15 ---
          // check -XX flags
          var ignoredXXFlags = Set.of(
                  // added by run-test framework
                  "MaxRAMPercentage",
                  // added by test environment
!                 "CreateCoredumpOnCrash",
+                 // experimental features unlocking flag does not affect behavior
+                 "UnlockExperimentalVMOptions",
+                 // all compact headers settings should run flagless tests
+                 "UseCompactObjectHeaders"
          );
          result &= allFlags.stream()
                            .filter(s -> s.startsWith("-XX:"))
                            // map to names:
                                // remove -XX: