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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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.

~Andrew

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