Hi everybody,

A few months ago, I upgraded my home server to new hardware. I've performed
a clean install of 4.6 (and follow -stable), and since the machine now has
a multi-core CPU, I chose the MP kernel. The machine works fine, but I've
noticed some sudden resets (and subsequent automatic boots) of the machine.

At this point, I suspect the hardware. These resets/reboots are quite rare,
perhaps one a month with the system running 24/7 (without any load to speak
of). I did notice that all of these these resets/reboots have occurred with
the MP kernel running. This could very well be a coincidence however.

I found that the dmesg buffer doesn't survive such a reset, while a normal
"shutdown -r now" keeps the dmesg buffer intact. Could this mean anything?

I wasn't able to find out why these resets occurred. I'm running
symon/syweb, and up to the moment of the reset nothing seems to stand out
in the graphs. The logs don't seem to show anything out of the ordinary as
well, they just stop.

Would the dmesg buffer not surviving such a reset be a clue to the cause of
these resets? 



(Dmesgs below, the first is a GENERIC.MP kernel, the second is the same
system running GENERIC.)


OpenBSD 4.6-stable (GENERIC.MP) #0: Sun Jan 17 21:22:19 CET 2010
    r...@calvin.stupendous.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 2145910784 (2046MB)
avail mem = 2071273472 (1975MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.5 @ 0xf06c0 (56 entries)
bios0: vendor American Megatrends Inc. version "0403" date 09/02/2008
bios0: ASUSTeK Computer INC. P5BV-C
acpi0 at bios0: rev 0
acpi0: tables DSDT FACP APIC MCFG OEMB HPET EINJ BERT ERST HEST
acpi0: wakeup devices P0P2(S4) P0P3(S4) P0P1(S4) PS2K(S4) PS2M(S4) UAR1(S4) 
UAR2(S4) USB0(S4) USB1(S4) USB2(S4) USB3(S4) EUSB(S4) MC97(S4) P0P4(S4) 
P0P5(S4) P0P6(S4) P0P7(S4) P0P8(S4) P0P9(S4) SLPB(S4)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz, 2500.02 MHz
cpu0: 
FPU,VME,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,NXE,LONG
cpu0: 2MB 64b/line 8-way L2 cache
cpu0: apic clock running at 333MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz, 2499.72 MHz
cpu1: 
FPU,VME,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,NXE,LONG
cpu1: 2MB 64b/line 8-way L2 cache
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz, 2499.72 MHz
cpu2: 
FPU,VME,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,NXE,LONG
cpu2: 2MB 64b/line 8-way L2 cache
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz, 2499.72 MHz
cpu3: 
FPU,VME,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,NXE,LONG
cpu3: 2MB 64b/line 8-way L2 cache
ioapic0 at mainbus0 apid 4 pa 0xfec00000, version 20, 24 pins
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 5 (P0P2)
acpiprt2 at acpi0: bus -1 (P0P3)
acpiprt3 at acpi0: bus 1 (P0P1)
acpiprt4 at acpi0: bus 4 (P0P4)
acpiprt5 at acpi0: bus -1 (P0P5)
acpiprt6 at acpi0: bus -1 (P0P6)
acpiprt7 at acpi0: bus -1 (P0P7)
acpiprt8 at acpi0: bus 3 (P0P8)
acpiprt9 at acpi0: bus 2 (P0P9)
acpicpu0 at acpi0: PSS
acpicpu1 at acpi0: PSS
acpicpu2 at acpi0: PSS
acpicpu3 at acpi0: PSS
acpibtn0 at acpi0: SLPB
acpibtn1 at acpi0: PWRB
cpu0: Enhanced SpeedStep 2499 MHz: speeds: 2497, 1998 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 3200/3210 Host" rev 0x01
ppb0 at pci0 dev 1 function 0 "Intel 3200/3210 PCIE" rev 0x01: apic 4 int 16 
(irq 11)
pci1 at ppb0 bus 5
ppb1 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x01: apic 4 int 16 
(irq 11)
pci2 at ppb1 bus 4
mpi0 at pci2 dev 0 function 0 "Symbios Logic SAS1064E" rev 0x08: apic 4 int 16 
(irq 11)
scsibus0 at mpi0: 112 targets
sd0 at scsibus0 targ 0 lun 0: <LSILOGIC, Logical Volume, 3000> SCSI2 0/direct 
fixed
sd0: 305175MB, 512 bytes/sec, 624998400 sec total
sd1 at scsibus0 targ 2 lun 0: <LSILOGIC, Logical Volume, 3000> SCSI2 0/direct 
fixed
sd1: 29563MB, 512 bytes/sec, 60545024 sec total
ppb2 at pci0 dev 28 function 4 "Intel 82801G PCIE" rev 0x01: apic 4 int 16 (irq 
11)
pci3 at ppb2 bus 3
mskc0 at pci3 dev 0 function 0 "Marvell Yukon 88E8056" rev 0x14, Yukon-2 EC 
Ultra rev. B0 (0x3): apic 4 int 16 (irq 11)
msk0 at mskc0 port A: address 00:26:18:65:bc:ab
eephy0 at msk0 phy 0: 88E1149 Gigabit PHY, rev. 1
ppb3 at pci0 dev 28 function 5 "Intel 82801G PCIE" rev 0x01: apic 4 int 17 (irq 
10)
pci4 at ppb3 bus 2
mskc1 at pci4 dev 0 function 0 "Marvell Yukon 88E8056" rev 0x14, Yukon-2 EC 
Ultra rev. B0 (0x3): apic 4 int 17 (irq 10)
msk1 at mskc1 port A: address 00:26:18:65:ba:d5
eephy1 at msk1 phy 0: 88E1149 Gigabit PHY, rev. 1
uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: apic 4 int 23 
(irq 5)
uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: apic 4 int 19 
(irq 7)
ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: apic 4 int 23 
(irq 5)
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb4 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xe1
pci5 at ppb4 bus 1
rl0 at pci5 dev 0 function 0 "Realtek 8139" rev 0x10: apic 4 int 21 (irq 6), 
address 00:e0:4d:52:a8:d1
rlphy0 at rl0 phy 0: RTL internal PHY
ral0 at pci5 dev 1 function 0 "Ralink RT2561S" rev 0x00: apic 4 int 22 (irq 
11), address 00:11:6b:3d:7f:6a
ral0: MAC/BBP RT2561C, RF RT2527
vendor "NetMos", unknown product 0x9865 (class communications subclass serial, 
rev 0x00) at pci5 dev 2 function 0 not configured
vendor "NetMos", unknown product 0x9865 (class communications subclass serial, 
rev 0x00) at pci5 dev 2 function 1 not configured
vendor "NetMos", unknown product 0x9865 (class communications subclass 
parallel, rev 0x00) at pci5 dev 2 function 2 not configured
vga1 at pci5 dev 3 function 0 "XGI Technology Volari Z7" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
pcib0 at pci0 dev 31 function 0 "Intel 82801GB LPC" rev 0x01
ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: apic 4 int 19 
(irq 7)
iic0 at ichiic0
lm1 at iic0 addr 0x2d: W83627DHG
spdmem0 at iic0 addr 0x51: 1GB DDR2 SDRAM ECC PC2-6400CL5
spdmem1 at iic0 addr 0x53: 1GB DDR2 SDRAM ECC PC2-6400CL5
usb1 at uhci0: USB revision 1.0
uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb2 at uhci1: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
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
wbsio0 at isa0 port 0x2e/2: W83627DHG rev 0x25
lm2 at wbsio0 port 0x290/8: W83627DHG
lm1 detached
mtrr: Pentium Pro MTRR support
softraid0 at root
root on sd1a swap on sd1b dump on sd1b
WARNING: / was not properly unmounted
syncing disks... 





OpenBSD 4.6-stable (GENERIC) #0: Sun Dec  6 21:49:42 CET 2009
    jos...@calvin.stupendous.org:/usr/src/sys/arch/amd64/compile/GENERIC
real mem = 2145910784 (2046MB)
avail mem = 2071302144 (1975MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.5 @ 0xf06c0 (56 entries)
bios0: vendor American Megatrends Inc. version "0403" date 09/02/2008
bios0: ASUSTeK Computer INC. P5BV-C
acpi0 at bios0: rev 0
acpi0: tables DSDT FACP APIC MCFG OEMB HPET EINJ BERT ERST HEST
acpi0: wakeup devices P0P2(S4) P0P3(S4) P0P1(S4) PS2K(S4) PS2M(S4) UAR1(S4) 
UAR2(S4) USB0(S4) USB1(S4) USB2(S4) USB3(S4) EUSB(S4) MC97(S4) P0P4(S4) 
P0P5(S4) P0P6(S4) P0P7(S4) P0P8(S4) P0P9(S4) SLPB(S4)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz, 2500.08 MHz
cpu0: 
FPU,VME,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,NXE,LONG
cpu0: 2MB 64b/line 8-way L2 cache
cpu0: apic clock running at 333MHz
cpu at mainbus0: not configured
cpu at mainbus0: not configured
cpu at mainbus0: not configured
ioapic0 at mainbus0 apid 4 pa 0xfec00000, version 20, 24 pins
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 5 (P0P2)
acpiprt2 at acpi0: bus -1 (P0P3)
acpiprt3 at acpi0: bus 1 (P0P1)
acpiprt4 at acpi0: bus 4 (P0P4)
acpiprt5 at acpi0: bus -1 (P0P5)
acpiprt6 at acpi0: bus -1 (P0P6)
acpiprt7 at acpi0: bus -1 (P0P7)
acpiprt8 at acpi0: bus 3 (P0P8)
acpiprt9 at acpi0: bus 2 (P0P9)
acpicpu0 at acpi0: PSS
acpibtn0 at acpi0: SLPB
acpibtn1 at acpi0: PWRB
cpu0: Enhanced SpeedStep 2500 MHz: speeds: 2497, 1998 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 3200/3210 Host" rev 0x01
ppb0 at pci0 dev 1 function 0 "Intel 3200/3210 PCIE" rev 0x01: apic 4 int 16 
(irq 11)
pci1 at ppb0 bus 5
ppb1 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x01: apic 4 int 16 
(irq 11)
pci2 at ppb1 bus 4
mpi0 at pci2 dev 0 function 0 "Symbios Logic SAS1064E" rev 0x08: apic 4 int 16 
(irq 11)
scsibus0 at mpi0: 112 targets
sd0 at scsibus0 targ 0 lun 0: <LSILOGIC, Logical Volume, 3000> SCSI2 0/direct 
fixed
sd0: 305175MB, 512 bytes/sec, 624998400 sec total
sd1 at scsibus0 targ 2 lun 0: <LSILOGIC, Logical Volume, 3000> SCSI2 0/direct 
fixed
sd1: 29563MB, 512 bytes/sec, 60545024 sec total
ppb2 at pci0 dev 28 function 4 "Intel 82801G PCIE" rev 0x01: apic 4 int 16 (irq 
11)
pci3 at ppb2 bus 3
mskc0 at pci3 dev 0 function 0 "Marvell Yukon 88E8056" rev 0x14, Yukon-2 EC 
Ultra rev. B0 (0x3): apic 4 int 16 (irq 11)
msk0 at mskc0 port A: address 00:26:18:65:bc:ab
eephy0 at msk0 phy 0: 88E1149 Gigabit PHY, rev. 1
ppb3 at pci0 dev 28 function 5 "Intel 82801G PCIE" rev 0x01: apic 4 int 17 (irq 
10)
pci4 at ppb3 bus 2
mskc1 at pci4 dev 0 function 0 "Marvell Yukon 88E8056" rev 0x14, Yukon-2 EC 
Ultra rev. B0 (0x3): apic 4 int 17 (irq 10)
msk1 at mskc1 port A: address 00:26:18:65:ba:d5
eephy1 at msk1 phy 0: 88E1149 Gigabit PHY, rev. 1
uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: apic 4 int 23 
(irq 5)
uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: apic 4 int 19 
(irq 7)
ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: apic 4 int 23 
(irq 5)
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb4 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xe1
pci5 at ppb4 bus 1
rl0 at pci5 dev 0 function 0 "Realtek 8139" rev 0x10: apic 4 int 21 (irq 6), 
address 00:e0:4d:52:a8:d1
rlphy0 at rl0 phy 0: RTL internal PHY
ral0 at pci5 dev 1 function 0 "Ralink RT2561S" rev 0x00: apic 4 int 22 (irq 
11), address 00:11:6b:3d:7f:6a
ral0: MAC/BBP RT2561C, RF RT2527
vendor "NetMos", unknown product 0x9865 (class communications subclass serial, 
rev 0x00) at pci5 dev 2 function 0 not configured
vendor "NetMos", unknown product 0x9865 (class communications subclass serial, 
rev 0x00) at pci5 dev 2 function 1 not configured
vendor "NetMos", unknown product 0x9865 (class communications subclass 
parallel, rev 0x00) at pci5 dev 2 function 2 not configured
vga1 at pci5 dev 3 function 0 "XGI Technology Volari Z7" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
pcib0 at pci0 dev 31 function 0 "Intel 82801GB LPC" rev 0x01
ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: apic 4 int 19 
(irq 7)
iic0 at ichiic0
lm1 at iic0 addr 0x2d: W83627DHG
spdmem0 at iic0 addr 0x51: 1GB DDR2 SDRAM ECC PC2-6400CL5
spdmem1 at iic0 addr 0x53: 1GB DDR2 SDRAM ECC PC2-6400CL5
usb1 at uhci0: USB revision 1.0
uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb2 at uhci1: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
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
wbsio0 at isa0 port 0x2e/2: W83627DHG rev 0x25
lm2 at wbsio0 port 0x290/8: W83627DHG
lm1 detached
mtrr: Pentium Pro MTRR support
softraid0 at root
root on sd1a swap on sd1b dump on sd1b


Thank you,
-- 
Jurjen Oskam

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