> Hi,
> 
> with 1.5x when I start ntpd my 4000/60 crashes with:
> 
> panic: pmap_enter onto myself
> Stopped in ntpd at      _pmap_enter+0x1be:      movb    $20, r0
> db> 
> 
> Any hints? 
> 
Yes! I got this problem reported from Johnny Billquist also, so I hunted
the problem down and have checked in a fix in -current + sent a pullup
request for 1.5.

Simplest way to avoid it before you get new source code is to comment 
out the panic in vax/pmap.c.

-- Ragge