Re: issues upgrading to 4.13

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Jan 18, 2021 at 11:55:15AM +1300, Mark Davies wrote:
> 
> 
> On 17/01/21 10:57 pm, Manuel Bouyer wrote:
> >> 1) xenstored is running at around 99% cpu, previously it hardly registered.
> > 
> > I'm not seeing this. Not sure how to debug it; maybe try a ktrace
> > to see what it's doing ?
> 
> 
> ktrace shows its in a loop polling
> 
> 		[...]
>    330      1 xenstored poll(0x7088c821b000, 0x69, 0xffffffff) = 88
>    330      1 xenstored __clock_gettime50(0x3, 0x7f7fff951db0) = 0
>    330      1 xenstored poll(0x7088c821b000, 0x69, 0xffffffff) = 88
>    330      1 xenstored __clock_gettime50(0x3, 0x7f7fff951db0) = 0
>    330      1 xenstored poll(0x7088c821b000, 0x69, 0xffffffff) = 88
>    330      1 xenstored __clock_gettime50(0x3, 0x7f7fff951db0) = 0
>    330      1 xenstored poll(0x7088c821b000, 0x69, 0xffffffff) = 88
>    330      1 xenstored __clock_gettime50(0x3, 0x7f7fff951db0) = 0
>    330      1 xenstored poll(0x7088c821b000, 0x69, 0xffffffff) = 88
>    330      1 xenstored __clock_gettime50(0x3, 0x7f7fff951db0) = 0
> 		[...]

looks like a descriptor that appears always ready when there's nothing to
do with it. I fear this will requires getting in the code to debug.

> 
> >> The qemu-dm-XXX.log reports lots of:
> >> qemu-system-i386: failed to create 'qdisk' device '5632': no dev parameter
> > 
> > I've also been migrating HVM guests from 4.11 to 4.13 and I've not
> > seen this. It's probably related to your disk = parameter;
> > what do you have ?
> 
> I still had cdrom entries from when the machines were set up, removing
> that helped.  Also the IP config had been statically configured on the
> machines and appears to have disappeared (change of driver?) - setting
> up dhcp for them got them on the network again.

Yes, it's possible that the qemu change appears as a hardware change for
the guest OS.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--