savecore: /bsd: kvm_dump_mkheader: invalid magic in cpu_hdr

[Marshall Midden <m4_(_at_)_NTS_(_dot_)_Umn_(_dot_)_EDU>]

savecore: /bsd: kvm_dump_mkheader: invalid magic in cpu_hdr

I don't seem to be able to figure out how to get rid of this message
from savecore.  (-f, -c don't work)  Examined the code in sbin/savecore.c,
then lib/libkvm and I do not see how to get around it.

Boot via -s, I can dd if=/dev/null of=/dev/rsd0b for a whole bunch.

(This was a "cleaned" disk drive.)

df
    /dev/sd0a         39543    24897    12669    66%    /

disklabel sd0			# deleted obvious stuff
    # /dev/rsd0c:
    disk: SCSI disk
    label: Quantum ProDrive
    sectors/track: 35
    tracks/cylinder: 6
    cylinders: 974
    total sectors: 204540
    rpm: 3662			# I haven't changed this, it is wierd.

    16 partitions:
    #        size   offset    fstype   [fsize bsize   cpg]
      a:    82320        0    4.2BSD     1024  8192    16   # (Cyl.    0 - 391)
      b:   122220    82320      swap                        # (Cyl.  392 - 973)
      c:   204540        0    unused        0     0         # (Cyl.    0 - 973)

dmesg | grep sd0 (edited)
 sd0 at scsibus0 targ 0 lun 0: <QUANTUM, P105SS 910-10-94, A.1> SCSI1 0/direct fixed
 sd0: 100MB, 1019 cyl, 6 head, 33 sec, 512 bytes/sec, 205075 sec total