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

[Robin Smidsrød]

On 19.03.2015 19:31, Mohammed Gamal wrote:
> 
> On Wed, Mar 18, 2015 at 7:09 PM, Kevin O'Connor <kevin at koconnor.net
> <mailto: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.

I thought maybe this commit was relevant,
https://git.ipxe.org/wimboot.git/commitdiff/1f11d05addc7aab9097b59e07680a0d1c05e34b3,
but noticed you're not using wimboot at all...

-- Robin