For example, java/lang/Thread/jni/AttachCurrentThread/AttachTest.java#id0 failed on riscv64 (probably other platforms unsupported in src/java.base/share/classes/jdk/internal/foreign/CABI.java might have the same issue):
 
Exception in thread "main" java.lang.UnsupportedOperationException: Unsupported os, arch, or address size: Linux, riscv, 64
at java.base/jdk.internal.foreign.CABI.current(CABI.java:69)
at java.base/jdk.internal.foreign.abi.SharedUtils.getSystemLinker(SharedUtils.java:237)
at java.base/java.lang.foreign.Linker.nativeLinker(Linker.java:198)
at ImplicitAttach.main(ImplicitAttach.java:48)