The following sequence of steps will produce extra bytes, that should not be visible, because they are not in the snapshot.
- Create a new file for writing.
- Write "hello world"
- Invoke hsync() on the file handle.
- Create a snapshot, keep the file open.
- Append another "hello world" string to the same file handle.
- Close the file.
- Read file in the snapshot (not the current file).
- Output is "hello worldhello world" instead of the expected snapshot contents of "hello world".