There seems to be a segv in ValueKlass::array_klass_impl.
More information is in the attached hs_err file.

It only seems to occur when running the test program multi-threaded and not when single threaded.

The current test is not trivial to package; if needed, a bundle or smaller example may exhibit the same symptoms. A core dump can be produced as well as needed.

The immediate source code of the test is:
      int newCap = 256;
      YNode<K,V>[] newTab = (YNode<K,V>[])new YNode[newCap];


And YNode:

 static inline class YNode<K,V> implements Map.Entry<K,V> {
        final int hash;
        final short probes; // maybe only a byte
        final K key;
        final V value;

        YNode() {
            this.hash = 0;
            this.probes = 0;
            this.key = null;
            this.value = null;
        }
        ...
}