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kern/53424: /proc/cpuinfo reports incorrect vendor_id and clflushsize for my processor

>Number:         53424
>Category:       kern
>Synopsis:       /proc/cpuinfo reports incorrect vendor_id and clflushsize for my processor
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 04 07:25:00 +0000 2018
>Originator:     Paul Goyette
>Release:        NetBSD 8.99.18
| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:          |
| (Retired)        | FA29 0E3B 35AF E8AE 6651 | paul at whooppee dot com   |
| Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd dot org |
System: NetBSD 8.99.18 NetBSD 8.99.18 (SPEEDY 2018-05-27 05:42:36 UTC) #0: Sun May 27 06:58:32 UTC 2018 amd64
Architecture: x86_64
Machine: amd64
/proc/cpuinfo reports strange value for vendor_id (a string of four \xff
characters which render as y-umlaut) and clflushsize.  Here's the info for
the first of 16 CPU threads (the others are identical):

processor       : 0
vendor_id       : ÿÿÿÿ
cpu family      : 12
model           : 9
model name      : Intel(R) Core(TM) i7-6900K CPU @ 3.20GHz
stepping        : 0
cpu MHz         : 3198.31
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 570624
wp              : yes
flags           : fpu apic mtrr pge mca pat pse36 pn clflush dts acpi mmx mmxext monitor ace cmp_legacy 3dnowprefetch osvw cqm xsaveopt cqm_llc cqm_occup_llc dtherm ida arat pln pts 
clflush size    : 524288

For comparison, please see the following ``cpuctl identify 0'' output:

cpu0: highest basic info 00000014
cpu0: highest extended info 80000008
cpu0: "Intel(R) Core(TM) i7-6900K CPU @ 3.20GHz"
cpu0: Intel Xeon E[57] v4 (Broadwell), Core i7-69xx Extreme (686-class), 3198.31 MHz
cpu0: family 0x6 model 0x4f stepping 0x1 (id 0x406f1)
cpu0: features 0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE>
cpu0: features 0xbfebfbff<MCA,CMOV,PAT,PSE36,CLFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2>
cpu0: features 0xbfebfbff<SS,HTT,TM,SBF>
cpu0: features1 0x7ffefbbf<SSE3,PCLMULQDQ,DTES64,MONITOR,DS-CPL,VMX,EST,TM2>
cpu0: features1 0x7ffefbbf<SSSE3,SDBG,FMA,CX16,xTPR,PDCM,PCID,DCA,SSE41,SSE42>
cpu0: features1 0x7ffefbbf<F16C,RDRAND>
cpu0: features2 0x2c100800<SYSCALL/SYSRET,XD,P1GB,RDTSCP,EM64T>
cpu0: features3 0x121<LAHF,LZCNT,PREFETCHW>
cpu0: features5 0x21cbfbb<FSGSBASE,TSCADJUST,BMI1,HLE,AVX2,SMEP,BMI2,ERMS>
cpu0: SEF edx 0xc000000<IBRS,STIBP>
cpu0: xsave features 0x7<x87,SSE,AVX>
cpu0: xsave instructions 0x1<XSAVEOPT>
cpu0: xsave area size: current 832, maximum 832, xgetbv enabled
cpu0: enabled xsave 0x7<x87,SSE,AVX>
cpu0: I-cache 32KB 64B/line 8-way, D-cache 32KB 64B/line 8-way
cpu0: L2 cache 256KB 64B/line 8-way
cpu0: L3 cache 20MB 64B/line 20-way
cpu0: 64B prefetching
cpu0: ITLB 64 4KB entries 8-way, 2M/4M: 8 entries
cpu0: DTLB 64 4KB entries 4-way
cpu0: L2 STLB 1536 4KB entries 6-way
cpu0: L1 1GB page DTLB 4 1GB entries 4-way
cpu0: Initial APIC ID 0
cpu0: Cluster/Package ID 0
cpu0: Core ID 0
cpu0: SMT ID 0
cpu0: DSPM-ecx 0x9<HWF,EPB>
cpu0: SEF highest subleaf 00000000
cpu0: microcode version 0xb00002c, platform ID 2

see above


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