[Bug 237968] 12-STABLE: MDS software mitigation locks up on Haswell

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Sat May 18 16:52:16 UTC 2019


            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 at FreeBSD.org
          Reporter: naddy at FreeBSD.org

FreeBSD 12.0-STABLE r347955 GENERIC amd64

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

Enabling Microarchitectural Data Sampling mitigation on a Haswell Xeon without
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="GenuineIntel"  Id=0x306c3  Family=0x6  Model=0x3c  Stepping=3
  AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
  AMD Features2=0x21<LAHF,ABM>
  Structured Extended
  Structured Extended Features3=0x9c000000<IBPB,STIBP,L1DFL,SSBD>
  XSAVE Features=0x1<XSAVEOPT>
  TSC: P-state invariant, performance statistics

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