From: utzoo!decvax!harpo!seismo!hao!hplabs!sri-unix!greep@Su-Dsn
Newsgroups: net.unix-wizards
Title: Re: Possible file table kernel problem
Article-I.D.: sri-arpa.905
Posted: Thu Mar 31 12:31:00 1983
Received: Tue Apr 19 04:05:40 1983

I've also had problems with close routines apparently not being called,
especially when signals were being used. (This was on a driver for the
Arpanet.) I think this is a known (but not too well known) bug in 4.1bsd.
I don't know any fix for it.

Also I once saw a tty left with the exclusive-open bit on, even though the
only process talking to it had been closed.  This may have also been caused
by the close routine not being called.  This was with the standard driver
(DZ), so no non-Berkeley code was involved.