[Bug 1641532] Please test proposed package
james.page at ubuntu.com
Thu Feb 23 19:45:57 UTC 2017
Hello Mehdi, or anyone else affected,
Accepted qemu into liberty-proposed. The package will build now and be
available in the Ubuntu Cloud Archive in a few hours, and then in the
Please help us by testing this new package. To enable the -proposed
sudo add-apt-repository cloud-archive:liberty-proposed
sudo apt-get update
Your feedback will aid us getting this update out to other Ubuntu users.
If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-liberty-needed to verification-liberty-done. If it
does not fix the bug for you, please add a comment stating that, and
change the tag to verification-liberty-failed. In either case, details
of your testing will help us make a better decision.
Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
** Changed in: cloud-archive/liberty
Status: In Progress => Fix Committed
** Tags added: verification-liberty-needed
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machine-types trusty and utopic are not unique (depend on the qemu
Status in Ubuntu Cloud Archive:
Status in Ubuntu Cloud Archive liberty series:
Status in qemu package in Ubuntu:
Status in qemu source package in Xenial:
Status in qemu source package in Yakkety:
Status in qemu source package in Zesty:
* Guests that were created with the Trusty (or Utopic) machine type are
not unique. Due to that on migrations between the qemu versions of
multiple Ubuntu releases migrations fail
* Many migrations work just by luck, one that fails is the Utopic Type on
Cloud-Archive Liberty to Xenial.
* The further one migrates that old guest the more breakage this
accumulates. E.g. a Trusty guest (qemu 2.0) migrated to Xenial
(thinks it is qemu 2.5 type) and from there migrating to Yakkety
(which expects it to be a 2.6 type).
* The fix is minimal and makes the types definition stable across
releases as they were intended
* Spawn a Guest of Type Utopic (the easiest still supported is Trusty +
Cloud Archive Liberty). And then migrate it to Xenial. Without the
patch migration fail, with the patches it works as both now agree
what the guest definition means. Please do note that both ends of the
migrations have to be fixed to get it working.
* Similar a Guest of type Trusty can with the fixes applied be migrated
X->Y->Z and back to X, while without the fix any backward way (and
probably a future forward way) will fail.
* Note: This is complex and there are many potential combinations - the
testlogs (comment #15) attached have various permutations of those.
It has shown that not only the Utopic type issue that was reported
gets fixed, but several backward migrations as well.
* While it fixes the cases that we know, and as testing showed also
several cases that we didn't know before there are two things we can
1. People have to restart the source guests so that the new fixed
definition will take effect.
But Trusty guests that were already migrated to a Host that has
the error will have to be restarted before they can be migrated
Note: no one has to restart guests on Trusty without Cloud
Archive; there the Trusty type is ok - it is a 2.0 which after
the fix Xenial/Yakkety agree.
2. Restarting the guests after the fix will "downgrade" the virtual
hardware. One can think of the machine types as the HW-revision of
the virtual HW. A Guest that was created as e.g. Trusty these days
on Xenial as incorrectly "too new" virtual HW, restarting the
guest will fix that - but as part of that new attributes that it
incorrectly gained when migrating/moving to the new host will be
taken away (to match the definition the guest had when it was
This is actually a fix, but might appear as a regression to
somebody without knowing what was going on.
Also anybody that "wants" the new HW can just upgrade the machine
type to get it, which is actually recommended anyway .
* This is a complex issue, please catch me (cpaelzer) on IRC if you
need/want to go into detail.
Or for Cloud Archive questions coreycb.
--- original description ---
I'm currently live-migrating many VMs from an old server to a new one,
and some VM can't be live migrated.
The source host is trusty with qemu-system-x86 1:2.3+dfsg-5ubuntu9.4~cloud2
The destination host is xenial with qemu-system-x86 1:2.5+dfsg-5ubuntu10.6
When the issue occurs, the destination host raises an error  and
stop the migration process.
The only difference I see between VMs where live migration works and
those were it doesn't work is a different machine type.
* migration works when VM have been created with pc-i440fx-vivid
* migration doesn't work when VM have been created with pc-i440fx-utopic
 the qemu error report by libvirt on the destination host
2016-11-14 08:25:40.774+0000: starting up libvirt version: 1.3.1, package: 1ubuntu10.5 (Stefan Bader <stefan.bader at canonical.com> Thu, 06 Oct 2016 13:07:20 +0200), qemu version: 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.6), hostname: n7.tetaneutral.net
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin QEMU_AUDIO_DRV=spice /usr/bin/kvm-spice -name a81e7133-9601-4432-86dd-a2401dcad8c2 -S -machine pc-i440fx-utopic,accel=kvm,usb=off -cpu Nehalem -m 256 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid a81e7133-9601-4432-86dd-a2401dcad8c2 -smbios 'type=1,manufacturer=OpenStack Foundation,product=OpenStack Nova,version=2015.1.2,serial=fe2641d2-543a-4d65-b75f-6337bf4b8744,uuid=a81e7133-9601-4432-86dd-a2401dcad8c2' -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-a81e7133-9601-4432-86dd-a2401dcad8c2/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive 'file=rbd:disks/a81e7133-9601-4432-86dd-a2401dcad8c2_disk.config:id=openstack-service:key=XXXXXXXXXXXX==:auth_supported=cephx\;none:mon_host=192.168.99.251\:6789\;192.168.99.252\:6789\;192.168.99.253\:6789,format=raw,if=none,id=drive-ide0-1-1,readonly=on,cache=none,aio=native' -device ide-cd,bus=ide.1,unit=1,drive=drive-ide0-1-1,id=ide0-1-1 -drive 'file=rbd:disks/volume-a82bb407-5ccb-4b0e-ba68-a0de1cd58cc3:id=openstack-service:key=XXXXXXXXXXXXXXXXXX:auth_supported=cephx\;none:mon_host=192.168.99.251\:6789\;192.168.99.252\:6789\;192.168.99.253\:6789,format=raw,if=none,id=drive-virtio-disk0,serial=a82bb407-5ccb-4b0e-ba68-a0de1cd58cc3,cache=none,aio=native' -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=43,id=hostnet0,vhost=on,vhostfd=45 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:37:fb:ba,bus=pci.0,addr=0x3 -chardev file,id=charserial0,path=/var/lib/nova/instances/a81e7133-9601-4432-86dd-a2401dcad8c2/console.log -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -device usb-tablet,id=input0 -spice port=5916,addr=0.0.0.0,disable-ticketing,seamless-migration=on -k en-us -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=16,bus=pci.0,addr=0x2 -incoming defer -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on
2016-11-14T08:25:44.216364Z qemu-system-x86_64: Unknown ramblock "/rom at etc/acpi/rsdp", cannot accept migration
2016-11-14T08:25:44.216394Z qemu-system-x86_64: error while loading state for instance 0x0 of device 'ram'
2016-11-14T08:25:44.216509Z qemu-system-x86_64: load of migration failed: Invalid argument
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