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Date:      Tue, 17 Feb 2015 10:56:57 +0200
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        sbruno@freebsd.org
Cc:        FreeBSD CURRENT <freebsd-current@freebsd.org>
Subject:   Re: Xen HVM Panic, HEAD
Message-ID:  <20150217085657.GR34251@kib.kiev.ua>
In-Reply-To: <54E2BF1E.4090002@ignoranthack.me>
References:  <54E2BF1E.4090002@ignoranthack.me>

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On Mon, Feb 16, 2015 at 08:10:06PM -0800, Sean Bruno wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
> 
> https://people.freebsd.org/~sbruno/Xen_APIC_panic.png
> 
> I suspect that there may be one or two more lines above this that are
> relevant to this panic, but XENHVM kernel's now panic booting on Xen
> server.  The working kernel output looks like this:
> 
> FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
> XEN: Hypervisor version 4.2 detected.
> CPU: Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz (2400.05-MHz
> K8-class CPU)
>   Origin="GenuineIntel"  Id=0x206c2  Family=0x6  Model=0x2c  Stepping=2
>  Features=0x1783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,HTT>
>  Features2=0x81ba2201<SSE3,SSSE3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,HV>
>   AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
>   AMD Features2=0x1<LAHF>
> Hypervisor: Origin = "XenVMMXenVMM"
> real memory  = 1434451968 (1368 MB)
> avail memory = 1353293824 (1290 MB)
> Event timer "LAPIC" quality 400
> ACPI APIC Table: <Xen HVM>
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> FreeBSD/SMP: 1 package(s) x 2 core(s)
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  2
> ioapic0: Changing APIC ID to 1
> MADT: Forcing active-low polarity and level trigger for SCI
I am not sure why your machine uses native lapic instead of xen lapic,
and should it be other way, or not.

Regardless, show the line number for the ipi_startup+0x56.
Did you performed clean kernel build ?



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