Several recent tier 6 jobs are timing out due to api/java_lang/ClassLoader/Ctor.html

From the log:
jib > Test api/java_lang/ClassLoader/Ctor.html has timed out and is not responding after 1,000 interrupts
jib > Test api/java_lang/ClassLoader/Ctor.html has timed out and is not responding after 2,000 interrupts
jib > Test api/java_lang/ClassLoader/Ctor.html has timed out and is not responding after 3,000 interrupts
... <snip> ...
jib > Test api/java_lang/ClassLoader/Ctor.html has timed out and is not responding after 338,000 interrupts
jib > Test api/java_lang/ClassLoader/Ctor.html has timed out and is not responding after 339,000 interrupts
jib > Test api/java_lang/ClassLoader/Ctor.html has timed out and is not responding after 340,000 interrupts
[2019-04-23T19:54:15,776Z][INFO][pool-2-thread-1][c.o.j.s.e.SparkyExecutorRunner] EXECUTION timed out after 600 minutes
[2019-04-23T19:54:15,781Z][ERROR][pool-2-thread-1][c.o.j.s.e.SparkyExecutorRunner] TimeoutException in EXECUTION.
java.util.concurrent.TimeoutException: null
at java.util.concurrent.FutureTask.get(FutureTask.java:205)
at com.oracle.java.sparky.executor.SparkyExecutorRunner.executeWithTimeout(SparkyExecutorRunner.java:54)
at com.oracle.java.sparky.executor.SparkyExecutorRunner.run(SparkyExecutorRunner.java:93)
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1626)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)