Recent CI test run:

[STDERR]
Java HotSpot(TM) 64-Bit Server VM warning: TieredCompilation disabled due to -Xint.

Timeout refired 3000 times
----------System.err:(18/1571)----------
Exception in thread "process reaper" java.lang.StackOverflowError
	at java.base/java.util.concurrent.ConcurrentHashMap.fullAddCount(ConcurrentHashMap.java:2576)
	at java.base/java.util.concurrent.ConcurrentHashMap.addCount(ConcurrentHashMap.java:2326)
	at java.base/java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1075)
	at java.base/java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:1541)
	at java.base/java.lang.invoke.MethodType$ConcurrentWeakInternSet.add(MethodType.java:1380)
	at java.base/java.lang.invoke.MethodType.makeImpl(MethodType.java:327)
	at java.base/java.lang.invoke.MethodType.insertParameterTypes(MethodType.java:421)
	at java.base/java.lang.invoke.VarHandle$AccessDescriptor.<init>(VarHandle.java:1860)
	at java.base/java.lang.invoke.MethodHandleNatives.varHandleOperationLinkerMethod(MethodHandleNatives.java:519)
	at java.base/java.lang.invoke.MethodHandleNatives.linkMethodImpl(MethodHandleNatives.java:463)
	at java.base/java.lang.invoke.MethodHandleNatives.linkMethod(MethodHandleNatives.java:451)
	at java.base/java.util.concurrent.CompletableFuture.completeValue(CompletableFuture.java:305)
	at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2143)
	at java.base/java.lang.ProcessHandleImpl$1.run(ProcessHandleImpl.java:162)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:835)

Searching JBS it seems this failure mode may have been continuing to happen since JDK-8173817, but was sometimes treated as part of a different test failure (e.g. see JDK-8182082 - not public sorry).