This test has timed out a few times in recent PIT and nightly testing.

Interesting thread stack:

"Thread-1" #13 daemon prio=5 os_prio=31 tid=0x00007ff713893800 nid=0x6803 in Object.wait() [0x0000000123297000]
   java.lang.Thread.State: RUNNABLE
   JavaThread state: _thread_blocked
Thread: 0x00007ff713893800 [0x6803] State: _at_safepoint _has_called_back 0 _at_poll_safepoint 0
   JavaThread state: _thread_blocked
at java.lang.invoke.InnerClassLambdaMetafactory.buildCallSite(InnerClassLambdaMetafactory.java:216)
at java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:304)
at java.lang.invoke.LambdaForm$DMH/1140627893.invokeStatic_L6_L(LambdaForm$DMH)
at java.lang.invoke.LambdaForm$BMH/2006937905.reinvoke(LambdaForm$BMH)
at java.lang.invoke.LambdaForm$MH/1979003548.invoke_MT(LambdaForm$MH)
at java.lang.invoke.CallSite.makeSite(CallSite.java:308)
at java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:245)
at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:235)
at java.util.concurrent.ThreadLocalRandom.initialSeed(ThreadLocalRandom.java:137)
at java.util.concurrent.ThreadLocalRandom.<clinit>(ThreadLocalRandom.java:134)
at java.util.concurrent.ConcurrentHashMap.fullAddCount(ConcurrentHashMap.java:2581)
at java.util.concurrent.ConcurrentHashMap.addCount(ConcurrentHashMap.java:2330)
at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1080)
at java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:1547)
at java.lang.invoke.MethodType$ConcurrentWeakInternSet.add(MethodType.java:1282)
at java.lang.invoke.MethodType.makeImpl(MethodType.java:314)
at java.lang.invoke.MethodType.methodType(MethodType.java:263)
at java.lang.invoke.CallSite.<clinit>(CallSite.java:228)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:288)
at ConcurrentClassLoadingTest$Loader.run(ConcurrentClassLoadingTest.java:151)

Please see attachment ConcurrentClassLoadingTest.jtr.txt for full log.