I pulled down the latest CVS this morning (around 1800 UTC on 4 Jan
2010) and built the kernel according to the FAQ, nothing special
included, just GENERIC.MP, and I've made no hardware changes to the
system.  When I boot using a 1 Jan kernel, there are no issues.  When
I reboot after building the new kernel, the system boots up until you
get to "scsibus0 at atapiscsi0: 2 targets", and then hangs.  no crash,
just stops booting.

I've managed to track it down to my DVD drive.  If I remove the drive
from the laptop and boot with the new kernel, there are no issues.
Here is what the 1 Jan kernel says the DVD is:

cd0 at scsibus0 targ 0 lun 0: <TSSTcorp, DVD+-RW TS-L632H, D600> ATAPI
5/cdrom removable
cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2

I cannot see a difference in the dmesg from 1 Jan and 4 Jan up to the
point where 4 Jan hangs.  Even setting "verbose" at the "boot" prompt
shows nothing.

As this laptop does not have a serial port, I can only give a dmesg
from the 1Jan kernel.  If you require more information, please reply.
Dmesg from 1 Jan is below.

Regards,
Bryan Brake

OpenBSD 4.6-current (build) #0: Fri Jan  1 04:55:44 CST 2010
    r...@2-core.my.domain:/usr/build
cpu0: Intel(R) Core(TM)2 Duo CPU T5250 @ 1.50GHz ("GenuineIntel"
686-class) 1.50 GHz
cpu0: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,EST,TM2,CX16,xTPR
real mem  = 3747627008 (3574MB)
avail mem = 3647549440 (3478MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 07/11/08, BIOS32 rev. 0 @
0xffa10, SMBIOS rev. 2.4 @ 0xf7180 (45 entries)
bios0: vendor Dell Inc. version "A09" date 07/11/2008
bios0: Dell Inc. Inspiron 1520
acpi0 at bios0: rev 2
acpi0: tables DSDT FACP HPET APIC MCFG SLIC BOOT SSDT
acpi0: wakeup devices PCI0(S3) PCIE(S4) USB1(S0) USB2(S0) USB3(S0)
USB4(S0) USB5(S0) EHC2(S0) EHCI(S0) AZAL(S3) RP01(S3) RP02(S3)
RP03(S3) RP04(S3) RP05(S3) RP06(S3) LID_(S3) PBTN(S4) MBTN(S5)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: apic clock running at 166MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM)2 Duo CPU T5250 @ 1.50GHz ("GenuineIntel"
686-class) 1.50 GHz
cpu1: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,EST,TM2,CX16,xTPR
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 2
acpiprt0 at acpi0: bus 3 (PCIE)
acpiprt1 at acpi0: bus -1 (AGP_)
acpiprt2 at acpi0: bus 11 (RP01)
acpiprt3 at acpi0: bus -1 (RP02)
acpiprt4 at acpi0: bus -1 (RP03)
acpiprt5 at acpi0: bus 12 (RP04)
acpiprt6 at acpi0: bus -1 (RP05)
acpiprt7 at acpi0: bus -1 (RP06)
acpiprt8 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0: C3, C2, C1, PSS
acpicpu1 at acpi0: C3, C2, C1, PSS
acpitz0 at acpi0: critical temperature 87 degC
acpibtn0 at acpi0: LID_
acpibtn1 at acpi0: PBTN
acpibtn2 at acpi0: SBTN
acpiac0 at acpi0: AC unit online
acpibat0 at acpi0: BAT0 model "DELL UW2807" serial 235 type LION oem "Sanyo"
acpivideo0 at acpi0: VID_
acpivout0 at acpivideo0: TV__
acpivout1 at acpivideo0: CRT_
acpivout2 at acpivideo0: LCD_
acpivout3 at acpivideo0: DVI_
acpivideo1 at acpi0: VID_
acpivout4 at acpivideo1: TV__
acpivout5 at acpivideo1: CRT_
acpivout6 at acpivideo1: LCD_
acpivout7 at acpivideo1: DVI_
acpivideo2 at acpi0: VID2
bios0: ROM list: 0xc0000/0xf000! 0xcf000/0x1000
cpu0: Enhanced SpeedStep 1496 MHz: speeds: 1500, 1000 MHz
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel GM965 Host" rev 0x0c
vga1 at pci0 dev 2 function 0 "Intel GM965 Video" rev 0x0c
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
intagp0 at vga1
agp0 at intagp0: aperture at 0xe0000000, size 0x10000000
inteldrm0 at vga1: apic 2 int 16 (irq 11)
drm0 at inteldrm0
"Intel GM965 Video" rev 0x0c at pci0 dev 2 function 1 not configured
uhci0 at pci0 dev 26 function 0 "Intel 82801H USB" rev 0x02: apic 2
int 20 (irq 10)
uhci1 at pci0 dev 26 function 1 "Intel 82801H USB" rev 0x02: apic 2
int 21 (irq 9)
ehci0 at pci0 dev 26 function 7 "Intel 82801H USB" rev 0x02: apic 2
int 22 (irq 7)
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
azalia0 at pci0 dev 27 function 0 "Intel 82801H HD Audio" rev 0x02:
apic 2 int 21 (irq 9)
azalia0: codecs: Sigmatel STAC9205X, Conexant/0x2c06, using Sigmatel STAC9205X
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel 82801H PCIE" rev 0x02: apic 2
int 16 (irq 0)
pci1 at ppb0 bus 11
ppb1 at pci0 dev 28 function 3 "Intel 82801H PCIE" rev 0x02: apic 2
int 19 (irq 0)
pci2 at ppb1 bus 12
uhci2 at pci0 dev 29 function 0 "Intel 82801H USB" rev 0x02: apic 2
int 20 (irq 10)
uhci3 at pci0 dev 29 function 1 "Intel 82801H USB" rev 0x02: apic 2
int 21 (irq 9)
uhci4 at pci0 dev 29 function 2 "Intel 82801H USB" rev 0x02: apic 2
int 22 (irq 7)
ehci1 at pci0 dev 29 function 7 "Intel 82801H USB" rev 0x02: apic 2
int 20 (irq 10)
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb2 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xf2
pci3 at ppb2 bus 3
bce0 at pci3 dev 0 function 0 "Broadcom BCM4401B1" rev 0x02: apic 2
int 17 (irq 10), address 00:1c:23:aa:63:5d
bmtphy0 at bce0 phy 1: BCM4401 10/100baseTX PHY, rev. 0
"Ricoh 5C832 Firewire" rev 0x05 at pci3 dev 1 function 0 not configured
sdhc0 at pci3 dev 1 function 1 "Ricoh 5C822 SD/MMC" rev 0x22: apic 2
int 18 (irq 4)
sdmmc0 at sdhc0
"Ricoh 5C843 MMC" rev 0x12 at pci3 dev 1 function 2 not configured
"Ricoh 5C592 Memory Stick" rev 0x12 at pci3 dev 1 function 3 not configured
"Ricoh 5C852 xD" rev 0x12 at pci3 dev 1 function 4 not configured
ichpcib0 at pci0 dev 31 function 0 "Intel 82801HBM LPC" rev 0x02: PM disabled
pciide0 at pci0 dev 31 function 1 "Intel 82801HBM IDE" rev 0x02: DMA,
channel 0 configured to compatibility, channel 1 configured to
compatibility
atapiscsi0 at pciide0 channel 0 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <TSSTcorp, DVD+-RW TS-L632H, D600> ATAPI
5/cdrom removable
cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
pciide0: channel 1 ignored (disabled)
pciide1 at pci0 dev 31 function 2 "Intel 82801HBM SATA" rev 0x02: DMA,
channel 0 configured to native-PCI, channel 1 configured to native-PCI
pciide1: using apic 2 int 17 (irq 10) for native-PCI interrupt
wd0 at pciide1 channel 0 drive 0: <SanDisk SDCFX3-016G>
wd0: 4-sector PIO, LBA, 15631MB, 32014080 sectors
wd0(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 4
ichiic0 at pci0 dev 31 function 3 "Intel 82801H SMBus" rev 0x02: apic
2 int 17 (irq 10)
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 2GB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM
spdmem1 at iic0 addr 0x52: 2GB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM
usb2 at uhci0: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci1: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci2: USB revision 1.0
uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb5 at uhci3: USB revision 1.0
uhub5 at usb5 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb6 at uhci4: USB revision 1.0
uhub6 at usb6 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at ichpcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
mtrr: Pentium Pro MTRR support
umass0 at uhub1 port 1 configuration 1 interface 0 "Western Digital
External HDD" rev 2.00/2.40 addr 2
umass0: using SCSI over Bulk-Only
scsibus1 at umass0: 2 targets, initiator 0
sd0 at scsibus1 targ 1 lun 0: <ST916082, 1A, 0000> SCSI0 0/direct fixed
sd0: 152627MB, 512 bytes/sec, 312581808 sec total
rum0 at uhub1 port 3 "Ralink 802.11 bg WLAN" rev 2.00/0.01 addr 3
rum0: MAC/BBP RT2573 (rev 0x2573a), RF RT2528, address 00:0e:3b:0a:ca:28
ugen0 at uhub3 port 2 "Novatel Wireless Inc. Novatel Wireless CDMA"
rev 1.10/0.00 addr 2
uhidev0 at uhub4 port 2 configuration 1 interface 0 "Logitech USB
Receiver" rev 2.00/5.00 addr 2
uhidev0: iclass 3/1
ums0 at uhidev0: 16 buttons, Z dir
wsmouse1 at ums0 mux 0
uhidev1 at uhub4 port 2 configuration 1 interface 1 "Logitech USB
Receiver" rev 2.00/5.00 addr 2
uhidev1: iclass 3/0, 17 report ids
uhid0 at uhidev1 reportid 3: input=4, output=0, feature=0
uhid1 at uhidev1 reportid 16: input=6, output=6, feature=0
uhid2 at uhidev1 reportid 17: input=19, output=19, feature=0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
root on wd0a swap on wd0b dump on wd0b

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