[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ Christian Ehrhardt ]

Hi again Richud,
the non LTS releases are on a 9 month period until EOL - that is what I 
followed.
Anyway we are not here to discuss support times but trying to help you.

Unfortunately in libvirt/qemu there are so many things called snapshots
that I can't help right away, would you mind opening a new bug to
discuss this there and leaving the old one here as-is?

Please outline there:
1. the way (command) you have taken your snapshots
2. the way (command) you try to re-start your snapshots
3. versions of the components installed (I guess apport-bug will do that for 
you)

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  Removal of former release machine types breaks VMs using them

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[richud]

Hi Christian,

Thank you for replying so quickly.

The 'old type' is only a year old which seems a bit early to be deprecated?
Sorry if I am missing something, but I see no way to fix all my broken 
snapshots without the previous machine type existing? (FAQ doesn't mention 
snapshots)


Perhaps this should be reworded too?;
"Each following release will keep the previously defined aliases to the 
specific types for compat. Adding a delta added have to make sure to not only 
add a new, but also maintain compatibility for the old type. "

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ Christian Ehrhardt ]

Hi Richud,
while the bug here was a special case with the wily type being used in Xenial 
and therefore to be retained until the EOL of xenial has passed.
It is different for other machine types like the ones you see issues with atm.

Keeping the old types "almost forever" is a common habit as people just
don't think about them usually. That has for several users caused much
more pain later on.  Therefore it is intended to (please choose your
preferred word) hint/encourage/enforce users to finally upgrade machine
types to pick up new features, stability and security fixes bound to new
types only.

See https://wiki.ubuntu.com/QemuKVMMigration#Support_Matrix

Due to that the qemu in Ubuntu 18.10 dropped Zesty and Yakkety
intentionally.

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[richud]

recurrence of bug

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[richud]

This bug has re-appeared as pc-i440fx-zesty (17.04) is not in the qemu
machine types in cosmic (18.10) - I can now no longer run any snapshots
I made when I was running 17.04.


error: unsupported configuration: Target domain machine type pc-i440fx-cosmic 
does not match source pc-i440fx-zesty


$ qemu-system-x86_64 -machine help
Supported machines are:
pc-i440fx-xenial Ubuntu 16.04 PC (i440FX + PIIX, 1996)
pc-i440fx-wily   Ubuntu 15.04 PC (i440FX + PIIX, 1996)
pc-i440fx-trusty Ubuntu 14.04 PC (i440FX + PIIX, 1996)
ubuntu   Ubuntu 18.10 PC (i440FX + PIIX, 1996) (alias of 
pc-i440fx-cosmic)
pc-i440fx-cosmic Ubuntu 18.10 PC (i440FX + PIIX, 1996) (default)
pc-i440fx-cosmic-hpb Ubuntu 18.10 PC (i440FX + PIIX +host-phys-bits=true, 1996)
pc-i440fx-bionic Ubuntu 18.04 PC (i440FX + PIIX, 1996)
pc-i440fx-bionic-hpb Ubuntu 18.04 PC (i440FX + PIIX, +host-phys-bits=true, 1996)
pc-i440fx-artful Ubuntu 17.10 PC (i440FX + PIIX, 1996)

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  Removal of former release machine types breaks VMs using them

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[Launchpad Bug Tracker]

This bug was fixed in the package qemu - 1:2.6.1+dfsg-0ubuntu4

---
qemu (1:2.6.1+dfsg-0ubuntu4) yakkety; urgency=medium

  * retain older xenial machine type to avoid issues starting guests
created on xenial prior to the SRU for bug 1621042. In that regard the old
broken xenial machine type and the new fixed one have both to be considered
as valid LTS machine types (LP: #1626070).

 -- Christian Ehrhardt   Wed, 21 Sep
2016 14:57:09 +0200

** Changed in: qemu (Ubuntu)
   Status: In Progress => Fix Released

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

Yeah Lain Lane just reported the same, thanks smoser for the extra check
- uploading ...

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[Ubuntu Foundations Team Bug Bot]

** Tags added: patch

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[Scott Moser]

Christian, I just verified that adding your ppa and upgrading qemu and
libvirt-bin fixes the problem.

I reproduced the original reported issue simply with:
uvt-kvm create sm1 release=yakkety

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

ppa now built and published, ready for verification

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

Did a local Test until launchpad builds and publishes:
1. create KVM capable xenial container
2. in the Xenial container create a guest
  KVM has default to wily (was one part of the old bug)
  $ KVM -M | grep wily
pc-i440fx-wily   Ubuntu 15.04 PC (i440FX + PIIX, 1996) (default)
3. create a guest and check its machine type
  $ virsh dumpxml testme | xmllint --xpath "string(//domain/os/type/@machine)" -
pc-i440fx-wily
4. upgrade to yakkety
   dpkg -l show  1:2.6.1+dfsg-0ubuntu3 now
5. check status of guest
  $ virsh list
 1 testme running
 Note: not killed on upgrade of the package as expected
  $ virsh dumpxml testme | xmllint --xpath "string(//domain/os/type/@machine)" -
 pc-i440fx-wilyroot
  $ virsh shutdown testme
  $ virsh start testme
 error: Failed to start domain testme
 error: internal error: process exited while connecting to monitor: 
2016-09-21T14:08:54.005107Z qemu-system-x86_64: -enable-kvm: unsupported 
machine type
 Use -machine help to list supported machines
6. insert locally built new version of qemu via local signed archive
dpkg -l show 1:2.6.1+dfsg-0ubuntu4 now
7. check if it starts correctly now
  $ virsh start testme
  $ virsh list
 3 testme running
  $ virsh dumpxml testme | xmllint --xpath "string(//domain/os/type/@machine)" -
 pc-i440fx-wily

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

Still building, but for what it is worth the test suite to check
proposed/ppa's now got an "upgrade test" that would have covered this.
Learn from your mistakes ...

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

Things look good to me now packages to verify are currently build at
https://launchpad.net/~paelzer/+archive/ubuntu/qemu-machine-type-dev

While this is urgent and I expect over the day more might show up to be
affected there is no reason to rush more and make it worse - so testing
again ...

@Lain - As just mentioned on IRC I'll try to ping you for a test once
they are published for a test by you as well.

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

add the broken wily type that xenial used as default.
Drop the default and alias, but keep everything else as-is to avoid issues with 
upgrades with VMs created on earlier Xenial systems.

** Patch added: "add wily type as it has to be kept being considered as valid 
xenial type"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1626070/+attachment/4745304/+files/fix-bug-1626070.debdiff

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

Debdiff ready and currently building for a local test - here attached
for review and later reference.

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

Yes I see on your qemu that you are on yakkety - ok good.
Not SRU broken Xenial but "only" certain cases of Yakkety.

thinking ...

So while anything you'd start as soon as the Xenial SRU lands will work
in yakkety you are right and identified a gap where things can break.
That is older (pre SRU) created Xenial guests - which due to an older
bug appear as wily guests - can't be started on Yakkety.

https://wiki.ubuntu.com/QemuKVMMigration defined the dropping of all
types before a former LTS release on the next dev release.

But due to the former issue on Xenial that means on Yakkety we have to
maintain the "Xenial type" in its old AND new form.

Ok, now all fits together - I can prep something for that.

** Changed in: qemu (Ubuntu)
   Status: New => In Progress

** Changed in: qemu (Ubuntu)
   Importance: Undecided => Critical

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

Well actually on checking to prep something - we didn't remove the 
pc-i440fx-wily type.
Just to avoid this issue ...

It was only removed in Yakkety, as migrations have to go "through"
Xenial.

So to confirm - you are likely on a Yakkety system and currently
struggle to get this done for machines you formerly created with xenial.

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[ChristianEhrhardt]

We knew it would happen for migrations, but you are right it is critical if 
people just start old (wrong) defines.
We certainly fixed the right issue, but yes the (correct) removal of the wily 
type which was the (wrong) default of xenial before can break new starts of 
former machines.

Damn - yes we have to add the type again ASAP - but not as default.
To avoid too much fallout.

Thanks for the report, we did so much testing on migrations and pre/post
upgrade things that we seemed to miss the obvious one.

I'll create a debdiff asap and upload.
That wily type will be identical to the one we had (which also is the same as 
the new ubuntu.xenial type which is why the reported fix worked)

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[Bug 1626070] Re: Removal of former release machine types breaks VMs using them

[Iain Lane]

Christian - thoughts? :)

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