Good time of day,

-------------------------
orphan# uname -a
OpenBSD orphan.oganer.net 4.2 GENERIC#0 i386
orphan# reboot
/etc/rc.shutdown in progress...
/etc/rc.shutdown complete.
syncing disks... done
rebooting...
*HANG*
-------------------------

same on latest snapshot kernel (w/ -stable userland)
halt(8) works fine,
strl-Alt-Del (before kernel boot) works fine
BIOS Setup defaults reset does not help

some kernel debugging:
printf() control points on cpu_reset():
-------------------------
syncing disks... done
rebooting...
cpu_reset(): disabling IRQs ...
cpu_reset(): calling (*cpuresetfn)() ...
cpu_reset(): hacking keyboard ...
*HANG*
-------------------------

comment out keyboard controller code:
-------------------------
syncing disks... done
rebooting...
cpu_reset(): disabling IRQs ...
cpu_reset(): calling (*cpuresetfn)() ...
cpu_reset(): hacking keyboard (disabled) ...
cpu_reset(): causing triple fault by IDT ...
*HANG*
-------------------------

comment out IDT invalidation code:
-------------------------
syncing disks... done
rebooting...
cpu_reset(): disabling IRQs ...
cpu_reset(): calling (*cpuresetfn)() ...
cpu_reset(): hacking keyboard (disabled) ...
cpu_reset(): causing triple fault by IDT (disabled) ...
cpu_reset(): causing triple fault by address space unmap ...
cpu_reset(): entering infinite loop ...
*HANG*
-------------------------

Any clue ?
Faulty hardware ? (looking for identical hardware to test)

Kind regards,

Ilya A. Kovalenko                  (mailto:[EMAIL PROTECTED])
SpecialEQ SW section
JSC Oganer-Service

P.S. dmesg (latest snapshot):

OpenBSD 4.2-current (GENERIC) #607: Tue Dec 18 18:36:52 MST 2007
    [EMAIL PROTECTED]:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel(R) Celeron(R) CPU 2.53GHz ("GenuineIntel" 686-class) 2.54 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,TM2,CNXT-ID,CX16,xTPR
real mem  = 502820864 (479MB)
avail mem = 478240768 (456MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 10/27/05, BIOS32 rev. 0 @ 0xfbf60, SMBIOS 
rev. 2.2 @ 0xf0000 (33 entries)
bios0: vendor Phoenix Technologies, LTD version "6.00 PG" date 10/27/2005
apm0 at bios0: Power Management spec V1.2 (slowidle)
apm0: AC on, battery charge unknown
acpi at bios0 function 0x0 not configured
pcibios0 at bios0: rev 2.1 @ 0xf0000/0xdef4
pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xfde50/160 (8 entries)
pcibios0: PCI Exclusive IRQs: 5 9 10 11
pcibios0: PCI Interrupt Router at 000:02:0 ("SiS 85C503 System" rev 0x00)
pcibios0: PCI bus #1 is the last bus
bios0: ROM list: 0xc0000/0x8000 0xc8000/0x8000! 0xd0000/0x1800 0xd2000/0x1800 
0xd4000/0x1800 0xef000/0x1000!
cpu0 at mainbus0
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "SiS 661 PCI" rev 0x11
agp0 at pchb0: aperture at 0xd0000000, size 0x8000000
ppb0 at pci0 dev 1 function 0 "SiS 648FX AGP" rev 0x00
pci1 at ppb0 bus 1
vga1 at pci1 dev 0 function 0 "SiS 6330 VGA" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
pcib0 at pci0 dev 2 function 0 "SiS 964 ISA" rev 0x36
pciide0 at pci0 dev 2 function 5 "SiS 5513 EIDE" rev 0x01: 661: DMA, channel 0 
configured to compatibility, channel 1 configured to compatibility
wd0 at pciide0 channel 0 drive 0: <WDC WD800BB-22JHC0>
wd0: 16-sector PIO, LBA, 76319MB, 156301488 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5
pciide0: channel 1 disabled (no drives)
auich0 at pci0 dev 2 function 7 "SiS 7012 AC97" rev 0xa0: irq 5, SiS7012 AC97
ac97: codec id 0x414c4760 (Avance Logic ALC655 rev 0)
audio0 at auich0
ohci0 at pci0 dev 3 function 0 "SiS 5597/5598 USB" rev 0x0f: irq 5, version 
1.0, legacy support
ohci1 at pci0 dev 3 function 1 "SiS 5597/5598 USB" rev 0x0f: irq 10, version 
1.0, legacy support
ohci2 at pci0 dev 3 function 2 "SiS 5597/5598 USB" rev 0x0f: irq 11, version 
1.0, legacy support
ehci0 at pci0 dev 3 function 3 "SiS 7002 USB" rev 0x00: irq 9
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "SiS EHCI root hub" rev 2.00/1.00 addr 1
sis0 at pci0 dev 4 function 0 "SiS 900 10/100BaseTX" rev 0x91: irq 10, address 
00:14:2a:f7:30:dd
rlphy0 at sis0 phy 9: RTL8201L 10/100 PHY, rev. 1
pciide1 at pci0 dev 5 function 0 "SiS 180 SATA" rev 0x01: DMA
pciide1: using irq 11 for native-PCI interrupt
em0 at pci0 dev 9 function 0 "Intel PRO/1000MT (82540EM)" rev 0x02: irq 11, 
address 00:07:e9:2a:a0:74
em1 at pci0 dev 10 function 0 "Intel PRO/1000MT (82540EM)" rev 0x02: irq 5, 
address 00:07:e9:2a:9f:9b
em2 at pci0 dev 11 function 0 "Intel PRO/1000MT (82540EM)" rev 0x02: irq 10, 
address 00:07:e9:2a:a2:a5
isa0 at pcib0
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
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
it0 at isa0 port 0x2e/2: IT8705F rev 0x03, EC port 0x290
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
usb1 at ohci0: USB revision 1.0
uhub1 at usb1 "SiS OHCI root hub" rev 1.00/1.00 addr 1
usb2 at ohci1: USB revision 1.0
uhub2 at usb2 "SiS OHCI root hub" rev 1.00/1.00 addr 1
usb3 at ohci2: USB revision 1.0
uhub3 at usb3 "SiS OHCI root hub" rev 1.00/1.00 addr 1
biomask ff65 netmask ff65 ttymask ffe7
mtrr: Pentium Pro MTRR support
uhidev0 at uhub1 port 2 configuration 1 interface 0 "vendor 0x10d5 UKU-M02 1.7" 
rev 1.10/0.00 addr 2
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 modifier keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev1 at uhub1 port 2 configuration 1 interface 1 "vendor 0x10d5 UKU-M02 1.7" 
rev 1.10/0.00 addr 2
uhidev1: iclass 3/1, 3 report ids
ums0 at uhidev1 reportid 1: 5 buttons and Z dir.
wsmouse0 at ums0 mux 0
uhid0 at uhidev1 reportid 2: input=1, output=0, feature=0
uhid1 at uhidev1 reportid 3: input=2, output=0, feature=0
softraid0 at root
root on wd0a swap on wd0b dump on wd0b

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