Sun Yaqi reported the issue:

The test case (java/nio/file/Files/CopyAndMove.java) fail with java.nio.file.NoSuchFileException: ./name1692782213124882428/link when it is a different volume/file system.
The createSymbolicLink(link, source) failed to create a symbolic link because a relative path was used.

STDERR:
dir1: /tmp/name7460415070033184926 (xfs)
dir2: ./name3202546005695331436 (ext4)
java.nio.file.NoSuchFileException: ./name3202546005695331436/link
    at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
    at java.base/sun.nio.fs.UnixFileSystem.copy(UnixFileSystem.java:1005)
    at java.base/sun.nio.fs.UnixFileSystemProvider.copy(UnixFileSystemProvider.java:300)
    at java.base/java.nio.file.Files.copy(Files.java:1303)
    at CopyAndMove.copyAndVerify(CopyAndMove.java:662)
    at CopyAndMove.testCopyFileToFile(CopyAndMove.java:914)
    at CopyAndMove.main(CopyAndMove.java:74)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at java.base/java.lang.reflect.Method.invoke(Method.java:578)
    at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
    at java.base/java.lang.Thread.run(Thread.java:1583)