I built world+kernel about an hour ago ( Dec 17 about 23:00 UTC)
and the kernel hangs in the middle of printing phk's GEOM diagnostics:

ad0: 76319MB <ST380021A> [155061/16/63] at ata0-master UDMA100
ad2: 42934MB <WDC WD450AA-00BAA0> [87233/16/63] at ata1-master UDMA66
acd0: CD-RW <R/RW 4x4x24> at ata1-slave PIO4

<snip slices 5 to 14 on ad0>

MBREXT Slice 15 on ad0s4:
0000   00 01 c1 ff a5 fe ff ff 3f 00 00 00 bd 08 fa 00  |........?.......|
[0] f:00 typ:165 s(CHS):255/1/193 e(CHS):255/254/255 s:63 l:16386237
0000   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  |................|
[1] f:00 typ:0 s(CHS):0/0/0 e(CHS):0/0/0 s:0 l:0

This is where the latest kernel hangs--between the first and second IDE
disks.  When I boot the previous kernel it continues normally with the 2nd
disk as follows:

MBREXT Slice 5 on ad2s4:
0000   00 01 c1 ff 0b fe ff ff 3f 00 00 00 de 4d 94 00  |........?....M..|
[0] f:00 typ:11 s(CHS):255/1/193 e(CHS):255/254/255 s:63 l:9719262
0000   00 00 c1 ff 05 fe ff ff 1d 4e 94 00 bd 86 bb 00  |.........N......|
[1] f:00 typ:5 s(CHS):255/0/193 e(CHS):255/254/255 s:9719325 l:12289725
MBREXT Slice 6 on ad2s4:
0000   00 01 c1 ff 83 fe ff ff 3f 00 00 00 7e 86 bb 00  |........?...~...|
[0] f:00 typ:131 s(CHS):255/1/193 e(CHS):255/254/255 s:63 l:12289662
0000   00 00 c1 ff 05 fe ff ff da d4 4f 01 86 7c fc 00  |..........O..|..|
[1] f:00 typ:5 s(CHS):255/0/193 e(CHS):255/254/255 s:22009050 l:16546950
MBREXT Slice 7 on ad2s4:
0000   00 01 c1 ff 83 fe ff ff 3f 00 00 00 47 7c fc 00  |........?...G|..|
[0] f:00 typ:131 s(CHS):255/1/193 e(CHS):255/254/255 s:63 l:16546887
0000   00 00 c1 ff 05 fe ff ff 50 a8 04 03 7e 04 7d 00  |........P...~.}.|
[1] f:00 typ:5 s(CHS):255/0/193 e(CHS):255/254/255 s:50636880 l:8193150
MBREXT Slice 8 on ad2s4:
0000   00 01 c1 ff 07 fe ff ff 3f 00 00 00 3f 04 7d 00  |........?...?.}.|
[0] f:00 typ:7 s(CHS):255/1/193 e(CHS):255/254/255 s:63 l:8193087
0000   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  |................|
[1] f:00 typ:0 s(CHS):0/0/0 e(CHS):0/0/0 s:0 l:0
Mounting root from ufs:/dev/ad0s3a
<snip>

# fdisk ad2
******* Working on device /dev/ad2 *******
parameters extracted from in-core disklabel are:
cylinders=87233 heads=16 sectors/track=63 (1008 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=87233 heads=16 sectors/track=63 (1008 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 169 (0xa9),(NetBSD)
    start 63, size 7373772 (3600 Meg), flag 0
	beg: cyl 0/ head 1/ sector 1;
	end: cyl 458/ head 254/ sector 63
The data for partition 2 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 7373835, size 17607240 (8597 Meg), flag 80 (active)
	beg: cyl 459/ head 0/ sector 1;
	end: cyl 1023/ head 254/ sector 63
The data for partition 3 is:
sysid 12 (0x0c),(DOS or Windows 95 with 32 bit FAT (LBA))
    start 24981138, size 4112577 (2008 Meg), flag 0
	beg: cyl 1023/ head 1/ sector 1;
	end: cyl 1023/ head 254/ sector 63
The data for partition 4 is:
sysid 15 (0x0f),(Extended DOS (LBA))
    start 29093715, size 58830030 (28725 Meg), flag 0
	beg: cyl 1023/ head 0/ sector 1;
	end: cyl 1023/ head 254/ sector 63



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