I have had the following crash occur about 4 times now.  DDB always catches
it at the same place.  This is NOT the memory problems caused by the bad
isa_machdep.c  This kernel is roughly a week old.  System uptime was ~1-2
days between crashes.  Hardware is slow old 386-20.

_sorflush+0xf	movl	0cx(%esi),%ecx
%esi	deadbeef
%ecx	0xc0000000

_sorflush(deadbeef,...)
_unp_detach()
_uipc_usrreq()
_soclose()
_soo_close()
_closef()
_fdrelease()
_close()