Re: Xen 4 serial hangs during boot

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 20/07/12 18:48, Christopher S. Aker wrote:
> On 10/13/11 6:46 AM, Tim Deegan wrote:
>> At 15:34 -0400 on 12 Oct (1318433686), Christopher S. Aker wrote:
>>> Since I started playing with Xen 4 (vs 3.x), machines often hang during
>>> reboot at exactly the same place:
> We're still seeing this occasionally, even with 'cpuinfo' added to Xen 
> args.  Serial console stops responding during Xen booting - every time 
> in the exact same place:
>
> 	(XEN) CPU9: Intel(R) Xeon(R) CPU L5520 @ 2.27GHz stepping 05
> 	(XEN) CPU 10
>
> The machine continues to boot and becomes available via network, however 
> nothing I do from then on can get serial to start working again. 
> Control-AAA, sending massive amounts to /dev/console, etc.  If I issue 
> the reboot command via dom0 something will tickle Xen and a page or two 
> of buffered OLD data will flush out the serial before the machine 
> reboots, which is interesting.
>
> In this state hvc_console receives no interrupts.  When not in this 
> state hvc_console seems to get interrupts occasionally.  Not sure of its 
> significance.
>
> I still have a box in this state if anyone has ideas to try.

Is this an HP box by any chance, and are you accessing serial over iLO?

~Andrew

>
> -Chris
>
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-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com