Gems can crash with page cache fault during stone shutdown
Under certain conditions, when the stone is shutdown immediately with
other sessions running (stopstone -I), there is a small possibility
that the currently running sessions may fail with a page cache fault,
followed by the expected #gsErrStnShutdown error (4057).
Since the stone is being shutdown anyway, this page cache fault is
benign and will not corrupt the DB. The error messages in the log
will indicate a "Bitmap page fault: leaf page <X> kind <K>.".
You can safely ignore this error message.