Three JVMTI tests in the same test run all timed out after passing. A fourth SA test failed, passed and then timed out in the same run (JDK-8377431). I think the way these tests are run needs to be examined.

serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorStatArrayCorrectnessTest.java
serviceability/jvmti/GetLocalVariable/GetLocalVars.java
serviceability/sa/TestDebugInfoDecode.java

VM args: -XX:+UnlockDiagnosticVMOptions -XX:+UseObjectMonitorTable