Date: Sun, 5 Aug 2012 11:31:11 +0200 (CEST) From: Jimmy Olgeni <olgeni@FreeBSD.org> To: FreeBSD-gnats-submit@FreeBSD.org Cc: jkim@FreeBSD.org Subject: amd64/170388: 8-STABLE amd64 past r233799 is unable to boot in certain KVM environments Message-ID: <201208050931.q759VBVD035002@backoffice.colby.local> Resent-Message-ID: <201208050940.q759e2Xe088761@freefall.freebsd.org>
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>Number: 170388
>Category: amd64
>Synopsis: 8-STABLE amd64 past r233799 is unable to boot in certain KVM environments
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-amd64
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Aug 05 09:40:02 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Jimmy Olgeni
>Release: FreeBSD 8.3-STABLE amd64
>Organization:
>Environment:
>Description:
FreeBSD 8-STABLE is unable to boot in some KVM environments after r233799.
------------------------------------------------------------------------
r233799 | jkim | 2012-04-02 20:27:06 +0200 (Mon, 02 Apr 2012) | 4 lines
MFC: r233702
Work around Erratum 721 for AMD Family 10h and 12h processors.
------------------------------------------------------------------------
The following panic message is shown immediately after the kernel starts:
===
kernel trap 9 with interrupts disabled
Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer = 0x20:0xffffffff808fd8dc
stack pointer = 0x28:0xffffffff80cd5440
frame pointer = 0x28:0xffffffff80cd5470
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = resume, IOPL = 0
current process = 0 ()
trap number = 9
panic: general protection fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff8064e18e at ??+0
#1 0xffffffff8061b247 at ??+0
#2 0xffffffff80912ca0 at ??+0
#3 0xffffffff80913235 at ??+0
#4 0xffffffff808faad4 at ??+0
#5 0xffffffff80904cc2 at ??+0
#6 0xffffffff801a0244 at ??+0
===
When booting from the latest 8-STABLE branch the booting process
just halts after the first panic line.
The same problem can be observed in 9-STABLE, but I did not actually
bisect all the way to the relevant commit yet. However, r233702
seems a reasonable guess.
Once the system is booted by reverting r233799, the following
processor information can be read:
CPU: Six-Core AMD Opteron(tm) Processor 2427 (2211.49-MHz K8-class CPU)
Origin = "AuthenticAMD" Id = 0x100f80 Family = 10 Model = 8 Stepping = 0
Features=0x783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2>
Features2=0x80802001<SSE3,CX16,POPCNT,HV>
AMD Features=0xe6500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,LM,3DNow!+,3DNow!>
AMD Features2=0x1f7<LAHF,CMP,SVM,CR8,ABM,SSE4A,MAS,Prefetch>
TSC: P-state invariant
Also, using x86info:
x86info v1.30. Dave Jones 2001-2011
Feedback to <davej@redhat.com>.
Extended Family: 1 Extended Model: 0 Family: 15 Model: 8 Stepping: 0
CPU Model (x86info's best guess): Phenom/Athlon/Sempron/Turion (II)/Opteron (HY-D0)
Processor name string (BIOS programmed): Six-Core AMD Opteron(tm) Processor 2427
Monitor/Mwait: min/max line size 0/0, ecx bit 0 support, enumeration extension
SVM: revision 1, 16 ASIDs, np, NRIPSave
Address Size: 48 bits virtual, 40 bits physical
running at an estimated 2.35GHz
Unfortunately I have no detailed information about the QEMU
configuration, but I set up a dedicated VM that I could use to test
patches.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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