This test doesn't clean-up after itself, it leaves at least one thread running.

"Thread-3256" #5226 daemon prio=5 os_prio=0 tid=0x28502c00 nid=0x1560 waiting on condition [0x2a5ef000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at GenerifyStackTraces$DumpThread.run(GenerifyStackTraces.java:68)