Re: [Xen-devel] dom0 / hypervisor hang on dom0 boot

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.05.13 at 11:12, Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx> wrote:
> Am Mittwoch 15 Mai 2013, 09:35:46 schrieb Jan Beulich:
>> >>> On 15.05.13 at 08:53, Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx> wrote:
>> > I tried iommu=debug and I can't see any faulting messages but Iam not
>> > familiar with this code.
>> > I attached the logging, maybe anyone can have a look on this.
>> 
>> Indeed, there are no faults being logged.
>> 
>> Following the comment yesterday - any chance you could try a
>> recent master branch kernel?
> 
> Sure I can do this, send me a link and I'll try this one.

http://download.opensuse.org/repositories/Kernel:/HEAD/standard/x86_64/

> The other thing is that the hypervisor doesn't respond to key pressing on 
> the
> serial line. This should always be working, shouldn't it?

As long as it's alive, it should.

> So I need some ideas how I can persuade the hypervisor to print a stack 
> trace
> in this situation.

Perhaps only (if at all) by instrumenting the hypervisor. The
question of course is how easily/quickly you can narrow down the
code region that it might be dying in. And whether it's a hypervisor
action at all that causes the hang (as opposed to something the
DRM code in Dom0 does).

Jan


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