The benchmark org.openjdk.bench.java.security.Signatures.EdDSA.sign should support 2 threads config for all algorithm. Now it failed with NPE for the 'algorithm = Ed25519'.
Output looks as:
# java -jar benchmarks.jar -f 1 -wi 1 -i 1 -t 2 -p messageLength=2048 Signatures.EdDSA
...
# Warmup Iteration 1: <failure>

java.lang.NullPointerException: Cannot invoke "sun.security.ec.ed.EdDSASignature$MessageAccumulator.getMessage()" because "this.message" is null
        at java.base/sun.security.ec.ed.EdDSASignature.engineSign(EdDSASignature.java:208)

The run with 'algorithm = Ed448' works fine.