system getting stuck with processes waiting in vm_map

[Geoff Wing <gcw%pobox.com@localhost>]

Sometime during a nightly "find" run processes start getting stuck.
Breaking into ddb and running "ps" shows lots of processes waiting
in "vm_map" (Also shown with "lwps" from gdb).

System is an MP i386 (with yamt's 
20080513142149.A90F311704%yamt.dyndns.org@localhost
patches)

Also, this isn't nice:
# ps -ax -O laddr -N netbsd.96 -M netbsd.96.core
[2]    1072 segmentation fault  ps -ax -O laddr -N netbsd.96 -M netbsd.96.core

Was ps one of the programs where support for this was being ripped out?
Yet it still has the options.  Seems to be crashing in kvm_getproc2().

Regards,
Geoff