AsyncStoreTest times out

times out randomly (spot e.g. on IBM JDK 1.8) with

org.testng.internal.thread.ThreadTimeoutException: Method org.testng.internal.TestNGMethod.testRepeatedPutRemove() didn't finish within the time-out 30000
at java.lang.Thread.yield(Native Method)
at org.infinispan.persistence.support.AsyncStoreTest$SlowAdvancedAsyncCacheWriter$1.get(AsyncStoreTest.java:84)
at org.infinispan.persistence.async.State.get(State.java:60)
at org.infinispan.persistence.async.AsyncCacheLoader.load(AsyncCacheLoader.java:34)
at org.infinispan.persistence.support.AsyncStoreTest.doTestRemove(AsyncStoreTest.java:361)
at org.infinispan.persistence.support.AsyncStoreTest.testRepeatedPutRemove(AsyncStoreTest.java:153)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:507)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:46)
at org.testng.internal.InvokeMethodRunnable.run(InvokeMethodRunnable.java:37)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:267)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1143)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:618)
at java.lang.Thread.run(Thread.java:785)