[ipxe-devel] [Qemu-devel] Emulation failure on booting/rebooting VMs

[Mohammed Gamal]

On Wed, Mar 18, 2015 at 7:09 PM, Kevin O'Connor <kevin at koconnor.net> wrote:

> On Wed, Mar 18, 2015 at 06:36:48PM +0100, Mohammed Gamal wrote:
> > Hi,
> > I've been sporadically getting my KVM virtual machines crashing with this
> > message while they're booting
> >
> > KVM internal error. Suberror: 1
> > emulation failure
> > EAX=00000000 EBX=00000000 ECX=00000000 EDX=00600f12
> > ESI=00000000 EDI=00000000 EBP=00000000 ESP=0000fffa
> > EIP=0000ff53 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
> > ES =0000 00000000 0000ffff 00009300
> > CS =f000 000f0000 0000ffff 00009b00
> > SS =0000 00000000 0000ffff 00009200
> > DS =0000 00000000 0000ffff 00009300
> > FS =0000 00000000 0000ffff 00009300
> > GS =0000 00000000 0000ffff 00009300
> > LDT=0000 00000000 0000ffff 00008200
> > TR =0000 00000000 0000ffff 00008300
> > GDT=     00000000 0000ffff
> > IDT=     00000000 0000ffff
> > CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
> > DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
> > DR3=0000000000000000
> > DR6=00000000ffff0ff0 DR7=0000000000000400
> > EFER=0000000000000000
> > Code=74 65 61 6d 2e 00 66 68 5f 55 00 00 e9 c3 f8 fb f4 cb 66 c3 <cf> 66
> 68
> > ff e6 00 00 e9 8b b1 66 55 66 57 66 56 66 53 66 89 c1 66 89 d6 a8 07 75
> 23
> > 66 0f
> >
> > I am running qemu 1.2, seabios 1.7.3 and ipxe (1.0.0-f6840ba) and the
> host
> > CPU is AMD Opteron 6386 SE running kernel 3.4.71.
>
> To debug seabios issues, we need the full log - see:
>   http://www.seabios.org/Debugging
>
> But, your software versions are a bit old which makes diagnosing any
> issues hard.  I suggest updating to the latest software and seeing if
> the problem is still present.
>
> -Kevin
>

Unfortunately I can't change that setup. The problem is also rather
sporadic so I have no other means to reproduce it and debug it.
I tried looking into the seabios code but it looks like the instruction
pointer is pointing at the default interrupt vector table entry
'entry_iret_official'. I presume this means that was triggered with an
interrupt of some sort? The other register values don't seem to provide any
clues nevertheless.
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