Hello,

I've just replaced the cpu in my machine with a i5-7600k and openbsd will no longer boot. The boot loader starts and loads the kernel which runs until acpicpu is loaded which prints "Unknown opcode: 0018 @ 1cb4". This happens on 6.4 and the latest snapshot but booting from the ram disk works without a problem. This occurs on both bsd.sp and bsd (mp). I've attached the dmesg from the ram disk but this doesn't show the problem.

I've taken photos of the trace and the dmesg from the crash.

trace:

https://ibb.co/7tXpFVf
https://ibb.co/j6DC8fn

dmesg:

https://ibb.co/6Df5x92
https://ibb.co/h8Sdg0B
https://ibb.co/xFvtGjt
https://ibb.co/hKDpwGY

The motherboard is a Asrock H110M-ITX/ac which has had the bios updated to support kaby lake. It worked without any problems before with a skylake pentium g4400.

Cheers, Mytchel.
OpenBSD 6.4-current (RAMDISK_CD) #537: Fri Jan  4 12:23:30 MST 2019
    [email protected]:/usr/src/sys/arch/amd64/compile/RAMDISK_CD
real mem = 8246497280 (7864MB)
avail mem = 7992590336 (7622MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0x772f6000 (25 entries)
bios0: vendor American Megatrends Inc. version "P7.20" date 03/01/2018
bios0: ASRock H110M-ITX/ac
acpi0 at bios0: rev 2
acpi0: tables DSDT FACP APIC FPDT FIDT MCFG HPET SSDT LPIT SSDT DBGP DBG2 SSDT 
AAFT SSDT UEFI SSDT BGRT DMAR
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5-7600K CPU @ 3.80GHz, 3801.10 MHz, 06-9e-09
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,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,SGX,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM,MPX,RDSEED,ADX,SMAP,CLFLUSHOPT,PT,IBRS,IBPB,STIBP,SENSOR,ARAT,XSAVEOPT,XSAVEC,XGETBV1,XSAVES,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: apic clock running at 23MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1, IBE
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 120 pins
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEG0)
acpiprt2 at acpi0: bus -1 (PEG1)
acpiprt3 at acpi0: bus -1 (PEG2)
acpiprt4 at acpi0: bus 2 (RP09)
acpiprt5 at acpi0: bus -1 (RP10)
acpiprt6 at acpi0: bus -1 (RP11)
acpiprt7 at acpi0: bus -1 (RP12)
acpiprt8 at acpi0: bus -1 (RP13)
acpiprt9 at acpi0: bus -1 (RP01)
acpiprt10 at acpi0: bus -1 (RP02)
acpiprt11 at acpi0: bus -1 (RP03)
acpiprt12 at acpi0: bus -1 (RP04)
acpiprt13 at acpi0: bus 1 (RP05)
acpiprt14 at acpi0: bus -1 (RP06)
acpiprt15 at acpi0: bus -1 (RP07)
acpiprt16 at acpi0: bus -1 (RP08)
acpiprt17 at acpi0: bus -1 (RP17)
acpiprt18 at acpi0: bus -1 (RP18)
acpiprt19 at acpi0: bus -1 (RP19)
acpiprt20 at acpi0: bus -1 (RP20)
acpiprt21 at acpi0: bus -1 (RP14)
acpiprt22 at acpi0: bus -1 (RP15)
acpiprt23 at acpi0: bus -1 (RP16)
acpiec0 at acpi0: not present
acpicpu at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
acpipwrres at acpi0 not configured
"PNP0A08" at acpi0 not configured
"PNP0B00" at acpi0 not configured
"PNP0C0E" at acpi0 not configured
"INT33A1" at acpi0 not configured
"PNP0C0C" at acpi0 not configured
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 vendor "Intel", unknown product 0x591f rev 0x05
"Intel HD Graphics 630" rev 0x04 at pci0 dev 2 function 0 not configured
xhci0 at pci0 dev 20 function 0 "Intel 100 Series xHCI" rev 0x31: msi, xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 
addr 1
"Intel 100 Series Thermal" rev 0x31 at pci0 dev 20 function 2 not configured
"Intel 100 Series MEI" rev 0x31 at pci0 dev 22 function 0 not configured
ahci0 at pci0 dev 23 function 0 "Intel 100 Series AHCI" rev 0x31: msi, AHCI 
1.3.1
ahci0: port 0: 6.0Gb/s
ahci0: port 1: 6.0Gb/s
ahci0: port 2: 6.0Gb/s
ahci0: PHY offline on port 3
scsibus0 at ahci0: 32 targets
sd0 at scsibus0 targ 0 lun 0: <ATA, Apacer AS220 128, AP00> SCSI3 0/direct 
fixed naa.5000000000000000
sd0: 122104MB, 512 bytes/sector, 250069680 sectors, thin
sd1 at scsibus0 targ 1 lun 0: <ATA, WDC WD10EZEX-00W, 01.0> SCSI3 0/direct 
fixed naa.50014ee0aecf1649
sd1: 953868MB, 512 bytes/sector, 1953523055 sectors
sd2 at scsibus0 targ 2 lun 0: <ATA, Samsung SSD 840, EXT0> SCSI3 0/direct fixed 
naa.50025388a04b1b6c
sd2: 114473MB, 512 bytes/sector, 234441648 sectors, thin
ppb0 at pci0 dev 28 function 0 "Intel 100 Series PCIE" rev 0xf1: msi
pci1 at ppb0 bus 1
ppb1 at pci0 dev 29 function 0 "Intel 100 Series PCIE" rev 0xf1: msi
pci2 at ppb1 bus 2
iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 3160" rev 0x83, msi
"Intel H110 LPC" rev 0x31 at pci0 dev 31 function 0 not configured
"Intel 100 Series PMC" rev 0x31 at pci0 dev 31 function 2 not configured
"Intel 100 Series HD Audio" rev 0x31 at pci0 dev 31 function 3 not configured
"Intel 100 Series SMBus" rev 0x31 at pci0 dev 31 function 4 not configured
em0 at pci0 dev 31 function 6 "Intel I219-V" rev 0x31: msi, address 
d0:50:99:ac:dc:69
isa0 at mainbus0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
efifb0 at mainbus0: 1920x1200, 32bpp
wsdisplay0 at efifb0 mux 1: console (std, vt100 emulation), using wskbd0
"vendor 0x8087 product 0x07dc" rev 2.00/0.01 addr 2 at uhub0 port 2 not 
configured
umass0 at uhub0 port 3 configuration 1 interface 0 "UFD 2.0 Silicon-Power8G" 
rev 2.00/1.00 addr 3
umass0: using SCSI over Bulk-Only
scsibus1 at umass0: 2 targets, initiator 0
sd3 at scsibus1 targ 1 lun 0: <UFD 2.0, Silicon-Power8G, 1.00> SCSI4 0/direct 
removable serial.13fe4100000000001139
sd3: 7474MB, 512 bytes/sector, 15308799 sectors
uhub1 at uhub0 port 5 configuration 1 interface 0 "vendor 0x05e3 USB2.0 Hub" 
rev 2.00/32.98 addr 4
uhidev0 at uhub1 port 1 configuration 1 interface 0 "Mytchel Trackball" rev 
2.00/1.00 addr 5
uhidev0: iclass 3/1
uhid at uhidev0 not configured
uhidev1 at uhub1 port 3 configuration 1 interface 0 "Mytchel Keyboard" rev 
2.00/1.00 addr 6
uhidev1: iclass 3/1
ukbd0 at uhidev1
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
softraid0 at root
scsibus2 at softraid0: 256 targets
root on rd0a swap on rd0b dump on rd0b
iwm0: could not read firmware iwm-3160-16 (error 2)
iwm0: failed to load init firmware

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