4.2bsd memall mfind crash

[Michael Urban]

We have recently added some additional disk drives to a Vax 11/780
running 4.2bsd (yeah, I know, I know).  We have since been crashing
on a "memall mfind" panic about once a day.  At first I thought the
problem was that we were mounting 17 file systems with NMOUNT set to
only 15, but increasing NMOUNT to 20 failed to alleviate the problem.
I note that the clause in memall that is producing the crash is a
patch that was added (four years ago!) to alleviate another panic, the
vaguely remembered MUNHASH bug.  

Does anyone know what the problem is here, and how to fix it?  This is
starting to cost us big bucks.

-- 
   Mike Urban
	...!trwrb!trwspp!spp2!urban 

"You're in a maze of twisty UUCP connections, all alike"