On Mon, Jun 14, 2021 at 11:23:06PM -0000, dann frazier wrote:
> btw, this bug says bionic guests fails to boot - do we know if other
> Ubuntu guests versions are OK?

Thanks for your efforts looking into this so far.

Yeah, I've only seen it in bionic. I tried spawning instances for all 
current supported releases, and only bionic failed:

ubuntu@juju-806ee7-stg-proposed-migration-43:~$ for ip in $(openstack server 
list | awk -F'[= |]+' '/bos01-arm64/ { print $6 }'); do timeout 60s ssh 
-oUserKnownHostsFile=/dev/null -oStrictHostKeyChecking=no ubuntu@${ip} 
'lsb_release -a; uptime'; done
Warning: Permanently added '10.43.128.5' (ECDSA) to the list of known hosts.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.7 LTS
Release:        16.04
Codename:       xenial
No LSB modules are available.
 08:21:32 up 3 days, 21:33,  0 users,  load average: 0.00, 0.00, 0.00
Warning: Permanently added '10.43.128.22' (ECDSA) to the list of known hosts.
Distributor ID: Ubuntu
Description:    Ubuntu Impish Indri (development branch)
Release:        21.10
Codename:       impish
No LSB modules are available.
 08:21:34 up 3 days, 21:33,  0 users,  load average: 0.00, 0.00, 0.00
Warning: Permanently added '10.43.128.8' (ECDSA) to the list of known hosts.
Distributor ID: Ubuntu
Description:    Ubuntu 21.04
Release:        21.04
Codename:       hirsute
No LSB modules are available.
 08:21:36 up 3 days, 21:33,  0 users,  load average: 0.00, 0.00, 0.00
Warning: Permanently added '10.43.128.4' (ECDSA) to the list of known hosts.
Distributor ID: Ubuntu
Description:    Ubuntu 20.10
Release:        20.10
Codename:       groovy
No LSB modules are available.
 08:21:38 up 3 days, 21:33,  0 users,  load average: 0.00, 0.00, 0.00
Warning: Permanently added '10.43.128.15' (ECDSA) to the list of known hosts.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:        20.04
Codename:       focal
No LSB modules are available.
 08:21:40 up 3 days, 21:33,  0 users,  load average: 0.03, 0.01, 0.00
ssh: connect to host 10.43.128.20 port 22: No route to host  # that's the 
bionic instance

and I double checked they all eneded up on an eMAG.

(I was trying all releases with a reboot loop to try to reproduce the 
other issue Julian mentioned on ubuntu-devel, but failed to cause it to 
happen ...)

What do you think about the "MDS mitigation" BIOS setting idea as a 
difference between the working/broken installations, is it worth trying 
to get IS to flip that?  Seems like it's probably sane to have it on, 
but it'd maybe be useful info.

Cheers,

-- 
Iain Lane                                  [ [email protected] ]
Debian Developer                                   [ [email protected] ]
Ubuntu Developer                                   [ [email protected] ]

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https://bugs.launchpad.net/bugs/1931728

Title:
  [scalingstack bos01] bionic (arm64) instances always fail to boot on
  eMAGs in this cloud

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