>  I can reproduceably get this panic on my i386 machine running a
>  DIAGNOSTIC kernel.  It appears whenever I rebuild nbmake (the very
>  first thing build.sh does).  It happens just after the 'cc -O -o
>  nbmake *.o' command:
>  
>  panic: kernel diagnostic assertion "opg->uobject == ufi->entry- 
>   >object.uvm_obj" failed: file "/usr/src/sys/uvm/uvm_fault.c", line 573
>  Stopped in pid 1886.1 (nbmake) at netbsd:cpu_Debugger+0x4: leave
>  db>
>  
>  At this point, I can't do anything.
>  
>  I don't have any "strange" mounts, contrary to apb@.  Everything is
>  happening locally on a single FFSv2 partition.

i tried to reproduce the problem, but no luck.
are you sure that it was really on a single ffsv2 partition,
including /tmp etc?

YAMAMOTO Takashi