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Re: xen/evtchn: Dom0 boot hangs using preempt_rt kernel 5.10
- To: Jason Andryuk <jandryuk@xxxxxxxxx>
- From: Luca Fancellu <luca.fancellu@xxxxxxx>
- Date: Tue, 23 Mar 2021 15:39:07 +0000
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Hi Jason,
Thanks for your hints, unfortunately seems not an init problem because in the
same init configuration I tried the 5.10.23 (preempt_rt) without the Juergen
patch but with the BUG_ON removed and it boots without problem. So seems that
applying the serie does something (on a preempt_rt kernel) and we are trying to
figure out what.
> On 23 Mar 2021, at 12:36, Jason Andryuk <jandryuk@xxxxxxxxx> wrote:
>
> On Mon, Mar 22, 2021 at 3:09 PM Luca Fancellu <luca.fancellu@xxxxxxx> wrote:
>>
>> Hi Juergen,
>>
>> Yes you are right it was my mistake, as you said to remove the BUG_ON(…)
>> this serie
>> (https://patchwork.kernel.org/project/xen-devel/cover/20210306161833.4552-1-jgross@xxxxxxxx/)
>> is needed, since I’m using yocto I’m able to build a preempt_rt kernel up
>> to the 5.10.23 and for this reason I’m applying that serie on top of this
>> version, then I’m removing the BUG_ON(…).
>>
>> A thing that was not expected is that now the Dom0 kernel is stuck on
>> “Setting domain 0 name, domid and JSON config…” step and the system seems
>> unresponsive. Seems like a deadlock issue but looking into the serie we
>> can’t spot anything and that serie was also tested by others from the
>> community.
>> Do you have any idea on that?
>
> I think this can happen if xenstored isn't running. Client access to
> xenstore blocks until xenstored becomes available. So check your init
> scripts ordering.
>
> Regards,
> Jason
Cheers,
Luca
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