Re: [Xen-devel] Xen-unstable 4.8: HVM domain_crash called from emulate.c:144 RIP: c000:[<000000000000336a>]

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 06/15/2016 10:07 AM, Jan Beulich wrote:
>>>> On 15.06.16 at 15:58, <linux@xxxxxxxxxxxxxx> wrote:
>> Wednesday, June 15, 2016, 2:48:55 PM, you wrote:
>>> Apart from that, and just to see whether there are other differences
>>> between your guest(s) and mine, could you post a guest config from
>>> one that's affected?
>> Hope you are not too disappointed it's rather sparse:
> In no way.
>
>> builder='hvm'
>> device_model_version = 'qemu-xen'
>> device_model_user = 'root'
>> memory = 512
>> name = 'test_guest'
>> vcpus = 4
>> cpu_weight = 768
>> vif = [ 'bridge=xen_bridge, ip=192.168.1.15, mac=00:16:3E:C4:72:83, 
>> model=e1000' ]
>> disk = [ 'phy:/dev/xen_vms/test_guest1,hda,w', 
>> 'phy:/dev/xen_vms/test_guest2,hdb,w' ]
>> on_crash = 'preserve'
>> boot='c'
>> vnc=0
>> serial='pty'
> I wonder whether mine having
>
> stdvga=0
>
> matters. Albeit a quick test passing stdvga=1 works here. And I
> don't think the vnc= setting should have an effect here.

Our nightly picked up this crash as well on an AMD box (Intel passed).

I believe this is due to

+       if ( *reps * bytes_per_rep > bytes )
+            *reps = bytes / bytes_per_rep;

in hvmemul_rep_stos() and then, as you pointed out in another message,
we fail p.count > *reps comparison.

-boris

-boris
in hvmemul_rep_stos.


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