Seeing this now with JDK 19:

```
$ ~/trunks/jdk/build/linux-x86_64-server-release/images/jdk/bin/java -jar tests-chapter-2a/target/jcstress.jar -m sanity -af NONE -sc false -t copy --jvmArgs "-XX:TieredStopAtLevel=1"

..... [TIMEOUT] o.o.j.t.copy.manual.arrays.large.volatiles.ShortTest
                            
  Scheduling class:
    actor1: package group free, core group free
    actor2: package group free, core group free

  CPU allocation: unspecified

  Compilation: unified across all actors

  JVM args: [-XX:TieredStopAtLevel=1]
  Fork: #1

  Messages:
    Timeout waiting for tasks to complete: 30013 ms
    Have stale threads, forcing VM to exit for proper cleanup.
```

The tests eventually succeed, if we bump the timeouts to much larger values (requires jcstress recompilation, unfortunately).

JDK 17 does these tests in 5 seconds. JDK 19 does these tests in 3.5 minutes, that is more than 40x slower.