Re: [Xen-devel] sudden hang on boot on AMD Notebook

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Apr 01, 2015 at 03:57:07PM +0100, Ian Campbell wrote:
> On Wed, 2015-04-01 at 15:39 +0100, Andrew Cooper wrote:
> > On 01/04/15 14:35, Olaf Hering wrote:
> > > On Mon, Mar 30, Andrew Cooper wrote:
> > >
> > >> On 30/03/15 13:14, Olaf Hering wrote:
> > >>> Just last week I was running staging to test pvscsi on this HP ProBook
> > >>> 6555b, since around Wednesday I think. But todays staging fails to boot.
> > >>> So I started a bisect in xen/, but every attempt to boot xen.gz results
> > >>> in a hang at the same place. Even going back to the state of 4.5.0.
> > >>> Any idea what may cause this hang, and how I can debug it further?
> > >> This smells like an external factor.  Have you changed compiler in that
> > >> time, altered the BIOS settings or updated the firmware?
> > > Nothing like that. I carried the thing around for a week, and started to
> > > run Xen during that time. Since Saturday its back in its usual place and
> > > position. I think I ran Xen on that day, but the bootlogs have no
> > > indication if I really did.
> > >
> > > Yesterday after some poking around in the firmware and running the
> > > selftests I was able to boot Xen again. But today it failed again.
> > >
> > >> Are you able to use the console debugkeys once it gets into this state?
> > > No, it does not react to anything. I think a triple CTRL-A and 'h'
> > > should print the help text? I see the cursor blinking on the display,
> > > not sure if thats an indication that Xen is still alive.
> > 
> > The keyhandlers should be set up by the point, although most of them are
> > deferred to tasklets.  Try the 'i' key which will run synchronously in
> > serial rx irq context.
> 
> Key handlers are only available via serial, I think, and not VGA which
> it sounds like what Olaf is looking at.

You can also use the USB EHCI debug port. It works great on laptops.

> 
> Ian.
> 
> 
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