🚀 go-pugleaf

Using emacs 18.57 on a Silicon Graphics running IRIX 4.0.4:

I rarely exit emacs, often keeping sessions going for many days at a time.  And
I edit large files pretty regularly.  Sometimes, usually when working on a
large file in an emacs that has been running for a long time, emacs gets into a
state where no matter what I do, I get a minibuffer message that says: "Back to
top level".  I can't save buffers, I can't exit; nothing.  All I can do is kill
the process (from outside) and hope that the autosave buffers aren't too out of
date, or I didn't have any important processes running.  

I can't put together a short way of recreating this problem, alas. Any idea
what causes it?  Any way I could get some warning or prevent it from happening?
Thanks for any suggestions....

				Larry
--
Lawrence Hunter, PhD.
National Library of Medicine
Bldg. 38A, MS-54
Bethesda. MD 20894
(301) 496-9300
(301) 496-0673 (fax)
hunter@nlm.nih.gov (internet)