Re: 3.4.70+ kernel WARNING spew dysfunction on failed migration

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

On 01/07/2014 02:36 PM, Boris Ostrovsky wrote:
> On 01/07/2014 02:23 PM, Ian Jackson wrote:
>> Konrad Rzeszutek Wilk writes ("Re: 3.4.70+ kernel WARNING spew 
>> dysfunction on failed migration"):
>>> On Tue, Jan 07, 2014 at 06:55:56PM +0000, Ian Jackson wrote:
>>>> For reasons I don't understand it doesn't seem to print the actual
>>>> kernel git hash in dmesg, but I think it was that from flight 22264,
>>>> i.e.  234d96ee0f3b8e49501d068a2a3165aa4db60903.  It's i386, on a
>>>> 64-bit Xen.
>>> This a bit of ancient kernel. Does it show up with 3.12?
>> 3.4.70 is what the osstest push gate is using.  (ISTR trying to switch
>> to 3.11 but encountering some problem.)
>>
>> I haven't tried 3.12 but can do so.
>>
>> Ian.
>
> This is hypercall failing, btw:
>
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/xen/events.c?id=refs/tags/v3.4.75#n1582 
>

More specifically, it fails

     if ( v->virq_to_evtchn[virq] != 0 )
         ERROR_EXIT(-EEXIST);

in Xen's evtchn_bind_virq().

Would be interesting to see if this is still a problem in new kernels.

-boris