From: Michael Wolfson <michael@nosflow.com>
MW> PowerMacintosh G4/733,867,800MP (Quicksilver)

Machine type: G4/800 Dual Quicksilver 
Kernel used:
  ftp://releng.netbsd.org/pub/NetBSD-daily/200206060000/macppc/binary/kernel/
  netbsd-GENERIC.gz

It is placed as /netbsd.1.gz and, 
    (following text is copied manually..)
0 > boot hd:,ofwboot.xcf hd:10/netbsd.1.gz load-size=e148 adler32=76210b01

loading XCOFF

tsize=cbc0 dsize=14a8 bsize=2670 entry=640000
SECTIONS:
.text	00640000 00640000 0000cbc0 000000e0
.data   0064d000 0064d000 000014a8 0000cca0
.bss    0064e4e8 0064e4a8 00002670 00000000
loading .text, done..
loading .data, done..
clearing .bss, done..

>> NetBSD/macppc OpenFirmware Boot, Revision 1.6
>> (makoto@ibook, Mon May 27 16:28:24 JST 2002)
3839052+219140 [187920+155996]=0x432e20
 start=0x100000
panic: lockmgr: pid 0, not exclusive lock holder 1008730187 unlocking
Stopped in pid () at   0x30f214:	lwz r0,r1, 0x14
db> 

(Unable to type in at above prompt)
I have seen the same thing several times with recent netbsd-1-6
branch.
---
Makoto Fujiwara, 
Chiba, Japan, Narita Airport and Disneyland prefecture.