libvirt users - Jul 2017 - memory snapshot save error

libvirt
version: 3.4.0
architecture: x86_64 ubuntu16.04-server
hypervisor: kvm,qemu

when I want make a memery snapshot for a vm ,and I call virsh save ,but tell me
this error:
error: Failed to save domain 177 to /datapool/mm.img
error: operation failed: domain save job: unexpectedly failed

xml configure:
<domain type='kvm' id='177'>
  <name>virt23</name>
  <uuid>e50c1d59-c4a3-4413-b6c9-20e90cced343</uuid>
  <metadata/>
  <memory unit='KiB'>10485760</memory>
  <currentMemory unit='KiB'>10485760</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='x86_64'
machine='pc-i440fx-2.5'>hvm</type>
    <boot dev='hd'/>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/datapool/zhuohf/virt23.qcow2'/>
      <backingStore/>
      <target dev='vdc' bus='virtio'/>
      <alias name='virtio-disk2'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x05' function='0x0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
<source file='/datapool/zhuohf/ubuntu-16.04.2-desktop-amd64.iso'/>
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      <backingStore/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <alias name='ide0-1-0'/>
      <address type='drive' controller='0' bus='1'
target='0' unit='0'/>
    </disk>
    <controller type='usb' index='0'
model='piix3-uhci'>
      <alias name='usb'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x2'/>
    </controller>
    <controller type='pci' index='0'
model='pci-root'>
      <alias name='pci.0'/>
    </controller>
    <controller type='ide' index='0'>
      <alias name='ide'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x1'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:e0:31:68'/>
      <source network='default' bridge='virbr0'/>
      <target dev='vnet11'/>
      <model type='rtl8139'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
    </interface>
    <input type='mouse' bus='ps2'>
      <alias name='input0'/>
    </input>
    <input type='keyboard' bus='ps2'>
      <alias name='input1'/>
</input>
    <graphics type='vnc' port='5909' autoport='yes'
listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='cirrus' vram='16384' heads='1'
primary='yes'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <stats period='1'/>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
    </memballoon>
  </devices>
  <seclabel type='none' model='none'/>
  <seclabel type='dynamic' model='dac'
relabel='yes'>
    <label>+0:+0</label>
    <imagelabel>+0:+0</imagelabel>
  </seclabel>
</domain>

before I encounter the same error,that time is my disk not free space，but this
time I can't find error reason.

Thanks

On Tue, Jul 25, 2017 at 09:39:22 +0800, 露露 wrote:
> libvirt
> version: 3.4.0
> architecture: x86_64 ubuntu16.04-server
> hypervisor: kvm,qemu
> 
> when I want make a memery snapshot for a vm ,and I call virsh save ,but
tell me this error:
> error: Failed to save domain 177 to /datapool/mm.img
> error: operation failed: domain save job: unexpectedly failed
You need to provide debug logs of the libvirt daemon in this case.