Several sun/tools/jhsdb tests timed out on MacOS X
in the 2017-07-10 JDK10-hs nightly:

sun/tools/jhsdb/AlternateHashingTest.java
sun/tools/jhsdb/BasicLauncherTest.java
sun/tools/jhsdb/HeapDumpTest.java
sun/tools/jhsdb/heapconfig/JMapHeapConfigTest.java

All four tests use LingeredApp; the last does not. I don't
know if that's a factor or not. I poked around the environment
and process information for the machine and I don't see any
obvious signs of resource exhaustion or overloading.