IssueTracker

We fail a jtreg test because we close a FileDescriptor when it's originating
FileInputStream is closed rather than waiting for all of its client
FileInputStreams to be closed. For example:

  FileInputStream a = new FileInputStream("a");
  FileInputStream b = new FileInputStream(a.getFD());
  a = null;
  b.read(); // may fail because 'a' may have been closed via its finalizer

We have options:
  A. Don't close a FileDescriptor until its own Finalizer runs. This has the best
chance of being correct, but it adds the GC burden of a finalizable object.
  B. Manually count references. This doesn't guarantee success in practice, since
a user could hold a FileDescriptor with no associated streams.

For now, I'm marking this to low priority and we will ignore it. This looks like
more of a theoretical issue than a practical one. If anyone runs into this in
practice, I think we should implement option A.

  FAIL java.io.FileDescriptor.Finalize (EXEC_FAILED)
    "Test for making sure that FIS/FOS.finalize() will not disturb the FD that is
still in use."
    Executing java.io.FileDescriptor.Finalize
    java.io.IOException
        at java.io.FileInputStream.openCheck(FileInputStream.java:366)
        at java.io.FileInputStream.read(FileInputStream.java:317)