My vultr OpenBSD 6.8 instance crashed and when it tried to reboot it
failed at:
root on sd0a (...)
WARNING: / was not properly unmounted
kernel: privileged instruction fault trap, code=0
mds_handler_skl_avx+0x33: clflush __ALIGN_SIZE+0x500(%rid,%rax,8)
I tried to boot from cd{68,69,70}iso but all of them "fail", i.e.,
they start to boot, show some messages, and then get to the boot
prompt again. Unfortunately the screen is cleared so I'm not sure
what the last message was, but it seems to be similar as above.
Unfortunately I don't have a previous dmesg from the system but I
have a different vultr instance which runs fine (see dmesg below)
I noticed at least one difference however:
the crashing system shows
Using Skylake AVX MDS workaround
which might be something related to the function mentioned above?
Is this workaround something that could be turned off to see whether
it causes the problem?
The weird thing is that OpenBSD 6.8 was installed fine
(11 months ago), so I don't understand why this problem happens now
(could vultr have changed something in the underlying system?)
OpenBSD 7.0 (GENERIC) #224: Thu Sep 30 14:13:34 MDT 2021
dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC
real mem = 1056817152 (1007MB)
avail mem = 1008914432 (962MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xf5950 (9 entries)
bios0: vendor Vultr
bios0: Vultr VC2
acpi0 at bios0: ACPI 3.0
acpi0: sleep states S3 S4 S5
acpi0: tables DSDT FACP APIC HPET MCFG WAET
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel Core Processor (Broadwell, no TSX, IBRS), 2394.77 MHz, 06-3d-02
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,RDTSCP,LONG,LAHF,ABM,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,IBRS,IBPB,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line
16-way L2 cache
cpu0: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped
cpu0: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 1000MHz
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpihpet0 at acpi0: 100000000 Hz
acpimcfg0 at acpi0
acpimcfg0: addr 0xb0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PCI0)
"ACPI0006" at acpi0 not configured
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
acpicmos0 at acpi0
"PNP0A06" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"QEMU0002" at acpi0 not configured
"ACPI0010" at acpi0 not configured
acpicpu0 at acpi0: C1(@1 halt!)
cpu0: using Broadwell MDS workaround
pvbus0 at mainbus0: KVM
pvclock0 at pvbus0
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82G33 Host" rev 0x00
vga1 at pci0 dev 1 function 0 "Cirrus Logic CL-GD5446" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
ppb0 at pci0 dev 2 function 0 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 22
pci1 at ppb0 bus 1
virtio0 at pci1 dev 0 function 0 "Qumranet Virtio 1.x Network" rev 0x01
vio0 at virtio0: address 56:00:03:98:50:6e
virtio0: msix shared
ppb1 at pci0 dev 2 function 1 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 22
pci2 at ppb1 bus 2
xhci0 at pci2 dev 0 function 0 vendor "Red Hat", unknown product 0x000d rev
0x01: apic 0 int 22, xHCI 0.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Red Hat xHCI root hub" rev 3.00/1.00
addr 1
ppb2 at pci0 dev 2 function 2 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 22
pci3 at ppb2 bus 3
virtio1 at pci3 dev 0 function 0 "Qumranet Virtio 1.x Storage" rev 0x01
vioblk0 at virtio1
scsibus1 at vioblk0: 1 targets
sd0 at scsibus1 targ 0 lun 0: <VirtIO, Block Device, >
sd0: 25600MB, 512 bytes/sector, 52428800 sectors
virtio1: msix shared
ppb3 at pci0 dev 2 function 3 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 22
pci4 at ppb3 bus 4
virtio2 at pci4 dev 0 function 0 vendor "Qumranet", unknown product 0x1045 rev
0x01
viomb0 at virtio2
virtio2: apic 0 int 22
ppb4 at pci0 dev 2 function 4 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 22
pci5 at ppb4 bus 5
virtio3 at pci5 dev 0 function 0 "Qumranet Virtio 1.x RNG" rev 0x01
viornd0 at virtio3
virtio3: apic 0 int 22
ppb5 at pci0 dev 2 function 5 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 22
pci6 at ppb5 bus 6
ppb6 at pci0 dev 2 function 6 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 22
pci7 at ppb6 bus 7
ppb7 at pci0 dev 2 function 7 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 22
pci8 at ppb7 bus 8
ppb8 at pci0 dev 3 function 0 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 23
pci9 at ppb8 bus 9
ppb9 at pci0 dev 3 function 1 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 23
pci10 at ppb9 bus 10
ppb10 at pci0 dev 3 function 2 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 23
pci11 at ppb10 bus 11
ppb11 at pci0 dev 3 function 3 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 23
pci12 at ppb11 bus 12
ppb12 at pci0 dev 3 function 4 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 23
pci13 at ppb12 bus 13
ppb13 at pci0 dev 3 function 5 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 23
pci14 at ppb13 bus 14
ppb14 at pci0 dev 3 function 6 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 23
pci15 at ppb14 bus 15
ppb15 at pci0 dev 3 function 7 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 23
pci16 at ppb15 bus 16
ppb16 at pci0 dev 4 function 0 vendor "Red Hat", unknown product 0x000c rev
0x00: apic 0 int 20
pci17 at ppb16 bus 17
pcib0 at pci0 dev 31 function 0 "Intel 82801IB LPC" rev 0x02
ahci0 at pci0 dev 31 function 2 "Intel 82801I AHCI" rev 0x02: msi, AHCI 1.0
ahci0: port 2: 1.5Gb/s
scsibus2 at ahci0: 32 targets
cd0 at scsibus2 targ 2 lun 0: <QEMU, QEMU DVD-ROM, 2.5+> removable
ichiic0 at pci0 dev 31 function 3 "Intel 82801I SMBus" rev 0x02: apic 0 int 16
iic0 at ichiic0
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
dt: 445 probes
uhidev0 at uhub0 port 5 configuration 1 interface 0 "QEMU QEMU USB Tablet" rev
2.00/0.00 addr 2
uhidev0: iclass 3/0
ums0 at uhidev0: 3 buttons, Z dir
wsmouse1 at ums0 mux 0
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
root on sd0a (489b79c5d6da2876.a) swap on sd0b dump on sd0b
