libvirt users - Feb 2015 - QEMU 2.2.0 managedsave: Unknown savevm section type 5

Hello,

I am running into issues restoring VMs during reboot for some of my XP VMs
- the environment is QEMU 2.2.0, libvirt 1.2.12 on CentOS 6.5 with KVM and
libvirt-guests is set to suspend at shutdown. The weird part is Windows 7
is restored properly from the managedsave however XP does not, doing a
start from virsh shows this:

virsh # start xp-check
error: Failed to start domain xp-check
error: internal error: early end of file from monitor: possible problem:
Unknown savevm section type 5
2015-02-04T23:55:37.117515Z qemu-kvm: load of migration failed: Invalid
argument

(qemu-kvm is a link to qemu-system-x86_64).

Any ideas how to fix this ?


Thanks

On 05.02.2015 01:54, Paul Apostolescu wrote:
> Hello,
> 
> I am running into issues restoring VMs during reboot for some of my XP
> VMs - the environment is QEMU 2.2.0, libvirt 1.2.12 on CentOS 6.5 with
> KVM and libvirt-guests is set to suspend at shutdown. The weird part is
> Windows 7 is restored properly from the managedsave however XP does not,
> doing a start from virsh shows this:
> 
> virsh # start xp-check
> error: Failed to start domain xp-check
> error: internal error: early end of file from monitor: possible problem:
> Unknown savevm section type 5
> 2015-02-04T23:55:37.117515Z qemu-kvm: load of migration failed: Invalid
> argument
> 
> (qemu-kvm is a link to qemu-system-x86_64).
> 
> Any ideas how to fix this ? 
Smells like qemu bug to me. The only way that this could be a libvirt
bug is that libvirt will generate a different qemu command line when the
guest is started and restored. Can you check that please?

Michal

How is saving done in libvirt ? I've looked at the QEMU source and
save/load does not use subsections at all (this is the "type 5" from
the
error message I get) but the live migration code does.

These are the commands from the corresponding /var/log/libvirt/qemu logs:

Windows 7:

LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none
/usr/libexec/qemu-kvm -name win7-check -S -machine
pc-i440fx-2.2,accel=kvm,usb=off -m 4000 -realtime mlock=off -smp
4,sockets=4,cores=1,threads=1 -uuid a905d7b0-4f48-4f13-a322-133009411e94
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/win7-check.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc
base=localtime,driftfix=slew -no-shutdown -boot strict=on -device
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=/data/win7-check.qcow2,if=none,id=drive-ide0-0-0,format=qcow2,cache=unsafe
-device
ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1
-netdev tap,fd=24,id=hostnet0 -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:52:71:88,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc
127.0.0.1:3 -device VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x2 -incoming
fd:21 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg
timestamp=on

XP:

LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none
/usr/libexec/qemu-kvm -name xp-check   -S -machine
pc-i440fx-2.2,accel=kvm,usb=off -m 977  -realtime mlock=off -smp
2,sockets=2,cores=1,threads=1 -uuid 429a6a4c-c5a3-4d75-89c0-9a075010aa9c
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/xp-check.monitor,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
base=localtime,driftfix=slew -no-shutdown -boot strict=on -device
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=/data/xp-check.qcow2,if=none,id=drive-ide0-0-0,format=qcow2,cache=unsafe
-device
ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1
-netdev tap,fd=23,id=hostnet0 -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:c5:25:ba,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc
127.0.0.1:1 -device VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x2 -incoming
fd:21 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg
timestamp=on

- Paul

On Thu Feb 05 2015 at 7:02:25 AM Michal Privoznik <mprivozn@redhat.com>
wrote:
> On 05.02.2015 01:54, Paul Apostolescu wrote:
> > Hello,
> >
> > I am running into issues restoring VMs during reboot for some of my XP
> > VMs - the environment is QEMU 2.2.0, libvirt 1.2.12 on CentOS 6.5 with
> > KVM and libvirt-guests is set to suspend at shutdown. The weird part
is
> > Windows 7 is restored properly from the managedsave however XP does
not,
> > doing a start from virsh shows this:
> >
> > virsh # start xp-check
> > error: Failed to start domain xp-check
> > error: internal error: early end of file from monitor: possible
problem:
> > Unknown savevm section type 5
> > 2015-02-04T23:55:37.117515Z qemu-kvm: load of migration failed:
Invalid
> > argument
> >
> > (qemu-kvm is a link to qemu-system-x86_64).
> >
> > Any ideas how to fix this ?
>
> Smells like qemu bug to me. The only way that this could be a libvirt
> bug is that libvirt will generate a different qemu command line when the
> guest is started and restored. Can you check that please?
>
> Michal
>

On 02/05/2015 05:02 AM, Michal Privoznik wrote:
> On 05.02.2015 01:54, Paul Apostolescu wrote:
>> Hello,
>>
>> I am running into issues restoring VMs during reboot for some of my XP
>> VMs - the environment is QEMU 2.2.0, libvirt 1.2.12 on CentOS 6.5 with
>> KVM and libvirt-guests is set to suspend at shutdown. The weird part is
>> Windows 7 is restored properly from the managedsave however XP does
not,
>> doing a start from virsh shows this:
>>
>> virsh # start xp-check
>> error: Failed to start domain xp-check
>> error: internal error: early end of file from monitor: possible
problem:
>> Unknown savevm section type 5
>> 2015-02-04T23:55:37.117515Z qemu-kvm: load of migration failed: Invalid
>> argument
>>
>> (qemu-kvm is a link to qemu-system-x86_64).
>>
>> Any ideas how to fix this ? 
> 
> Smells like qemu bug to me.
Agreed.  Usually a sign of you upgrading to a newer qemu version than
the one that created the managedsave image.  Beyond reporting it to the
qemu folks, my other suggestion is to downgrade qemu, see if you can
restore the file, then cleanly shut down the guest.  Then upgrade qemu,
and boot from scratch instead of trying to load the save image.  That
way, you avoid the cross-qemu migration bug.  Another option is to nuke
the managedsave image and force a fresh boot, but that's a bit more
drastic as it loses any unsaved data that was in memory but not flushed
to disk, and most likely require an fsck (that is, nuking the
managedsave image is equivalent to pulling the power cord on a running
bare-metal machine, then recovering when restoring power for the next
boot) [virsh managedsave-remove]

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

On Wed, Feb 04, 2015 at 07:54:07PM -0500, Paul Apostolescu
wrote:
> Hello,
> 
> I am running into issues restoring VMs during reboot for some of my XP VMs
> - the environment is QEMU 2.2.0, libvirt 1.2.12 on CentOS 6.5 with KVM and
> libvirt-guests is set to suspend at shutdown. The weird part is Windows 7
> is restored properly from the managedsave however XP does not, doing a
> start from virsh shows this:
> 
> virsh # start xp-check
> error: Failed to start domain xp-check
> error: internal error: early end of file from monitor: possible problem:
> Unknown savevm section type 5
> 2015-02-04T23:55:37.117515Z qemu-kvm: load of migration failed: Invalid
> argument
> 
> (qemu-kvm is a link to qemu-system-x86_64).
> 
> Any ideas how to fix this ?
It could be this QEMU issue:
http://thread.gmane.org/gmane.comp.emulators.qemu/319527/focus=319653

Jan
> 
> 
> Thanks
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