My sparc kernels compiled (cross compiled on i386) after Fri Dec 14 all do:

	cpu0: NMI: system interrupts: 40000000<VME=0,SBUS=0,ME>
	trap type 0x29: pc=0xa1594 npc=0xa1598 psr=4000084<S>
	trap type 0x29: pc=0xf0008410 npc=0xf0008414 psr=44000c0<S,PS>
	kernel: trap trap
	Stopped in pid 212 (Xsun) at Lbcopy_doubles: ldd [%o0 + %g0], %o4

Output of dmesg (from last working kernel):

[ using 253896 bytes of netbsd ELF symbol table ]
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 1.5Z (CUSTOM) #88: Fri Dec 14 09:57:08 MET 2001
    root@dancer:/usr/obj/kern.sparc/CUSTOM
total memory = 97916 KB
avail memory = 87276 KB
using 896 buffers containing 4996 KB of memory
bootpath: /iommu@0,10000000/sbus@0,10001000/espdma@4,8400000/esp@4,8800000/sd@0,0
mainbus0 (root): SUNW,SPARCstation-5
cpu0 at mainbus0: MB86904 @ 100 MHz, on-chip FPU
cpu0: 16K instruction (32 b/l), 8K data (16 b/l): cache enabled
obio0 at mainbus0
clock0 at obio0 slot 0 offset 0x200000: mk48t08: hostid 80006139
timer0 at obio0 slot 0 offset 0xd00000 delay constant 47
zs0 at obio0 slot 0 offset 0x100000 level 12 softpri 6
zstty0 at zs0 channel 0
zstty1 at zs0 channel 1
zs1 at obio0 slot 0 offset 0x0 level 12 softpri 6
kbd0 at zs1 channel 0: baud rate 1200 (console input)
ms0 at zs1 channel 1: baud rate 1200
slavioconfig at obio0 slot 0 offset 0x800000 not configured
auxreg0 at obio0 slot 0 offset 0x900000
power0 at obio0 slot 0 offset 0x910000 level 2
fdc0 at obio0 slot 0 offset 0x400000 level 11 softpri 4: chip 82077
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
iommu0 at mainbus0 addr 0x10000000: version 0x4/0x0, page-size 4096, range 64MB
sbus0 at iommu0: clock = 25 MHz
dma0 at sbus0 slot 4 offset 0x8400000: dma rev 2
esp0 at dma0 slot 4 offset 0x8800000 level 4: ESP200, 40MHz, SCSI ID 7
scsibus0 at esp0: 8 targets, 8 luns per target
audioamd0 at sbus0 slot 4 offset 0x1300000 level 7 (ipl 13) softpri 4
audio0 at audioamd0: full duplex
bpp0 at sbus0 slot 4 offset 0xc800000 level 2 (ipl 3): dma rev 2
ledma0 at sbus0 slot 4 offset 0x8400010: dma rev 2
le0 at ledma0 slot 4 offset 0x8c00000 level 6: address 00:60:4e:00:61:39
le0: 8 receive buffers, 2 transmit buffers
cgthree0 at sbus0 slot 0 offset 0x0 level 9: SUNW,501-1718, 1152 x 900 (console)
cgthree0: attached to /dev/fb
SUNW,CS4231 at sbus0 slot 3 offset 0xc000000 level 9 not configured
power-management at sbus0 slot 3 offset 0xa000000 not configured
scsibus0: waiting 2 seconds for devices to settle...
sd0 at scsibus0 target 0 lun 0: <SEAGATE, ST32272N, 0876> SCSI2 0/direct fixed
sd0: 2157 MB, 6300 cyl, 4 head, 175 sec, 512 bytes/sect x 4419464 sectors
sd0: sync (100.0ns offset 15), 8-bit (10.000MB/s) transfers, tagged queueing
IPsec: Initialized Security Association Processing.
root on sd0a dumps on sd0b
root file system type: ffs
cpu0: booting secondary processors:

I cannot get a core dump.
-- 
Juergen Hannken-Illjes - hannken@eis.cs.tu-bs.de - TU Braunschweig (Germany)