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Date:      Sat, 18 May 2019 16:52:14 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 237968] 12-STABLE: MDS software mitigation locks up on Haswell
Message-ID:  <bug-237968-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D237968

            Bug ID: 237968
           Summary: 12-STABLE: MDS software mitigation locks up on Haswell
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: naddy@FreeBSD.org

FreeBSD 12.0-STABLE r347955 GENERIC amd64

hw.mds_disable=3D3 (Automatic VERW or Software selection) in /boot/loader.c=
onf

Enabling Microarchitectural Data Sampling mitigation on a Haswell Xeon with=
out
MD_CLEAR microcode causes the kernel to hang on boot after the ioapic0 line.

CPU: Intel(R) Xeon(R) CPU E3-1225 v3 @ 3.20GHz (3192.67-MHz K8-class CPU)
  Origin=3D"GenuineIntel"  Id=3D0x306c3  Family=3D0x6  Model=3D0x3c  Steppi=
ng=3D3
=20
Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,=
MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=3D0x7ffafbff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSS=
E3,SDBG,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AE=
SNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
  AMD Features=3D0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
  AMD Features2=3D0x21<LAHF,ABM>
  Structured Extended
Features=3D0x27ab<FSGSBASE,TSCADJ,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,NFPUSG>
  Structured Extended Features3=3D0x9c000000<IBPB,STIBP,L1DFL,SSBD>
  XSAVE Features=3D0x1<XSAVEOPT>
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID
  TSC: P-state invariant, performance statistics

--=20
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