[Qemu-devel] [Bug 1455475] [NEW] Block Commit: [100 %]error: failed to pivot job for disk vda

[Tim Rohde]

Public bug reported:

Hi,

i´ve a Problem with committing a snapshot. The problem was discussed on
the libvirt mailing list earlier this year.

https://www.redhat.com/archives/libvirt-users/2015-January/msg00029.html


Iam running gentoo and:

Compiled against library: libvirt 1.2.14
Using library: libvirt 1.2.14
Using API: QEMU 1.2.14
Running hypervisor: QEMU 2.3.0

I´am running a Windows Server 2012 R2 VM with the latest quest driver
(0.1.96) and  QEMU quest Agent 0.12.1 installed.

The domain is started with following command line:

/usr/bin/qemu-system-x86_64 -name $DOMAIN -S -machine 
pc-i440fx-1.6,accel=kvm,usb=off -m 8192 -realtime mlock=off -smp 
8,sockets=8,cores=1,threads=1 -uuid c96ef576-dbfc-49aa-9dd0-068886c4ef0e 
-no-user-config -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/$DOMAIN.monitor,server,nowait 
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime 
-no-shutdown -boot strict=on -device 
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device 
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive 
file=/var/lib/libvirt/images/$DOMAIN.qcow2,if=none,id=drive-virtio-disk0,format=qcow2
 -device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
 -netdev tap,fd=25,id=hostnet0,vhost=on,vhostfd=26 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:07:b4:0a,bus=pci.0,addr=0x3 
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 
-chardev 
socket,id=charchannel0,path=/var/lib/libvirt/qemu/f16x86_64.agent,server,nowait 
-device 
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
 -device usb-tablet,id=input0 -vnc 127.0.0.1:6 -k de -device 
VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x5 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on
char device redirected to /dev/pts/2 (label charserial0)


I´ve created the snapshot with:

virsh # snapshot-create-as --domain $DOMAIN snap1 --diskspec 
vda,file=/var/lib/libvirt/images/snap1.qcow2 --quiesce --disk-only --atomic 
--no-metadata
Domain snapshot snap1 created

If i try to commit the snapshot i get this error:

virsh # blockcommit $DOMAIN vda --active --verbose --pivot
error: internal error: unable to execute QEMU command 'block-commit': Device 
'drive-virtio-disk0' is busy: block device is in use by block job: commit


virsh # blockjob $DOMAIN /var/lib/libvirt/images/snap1.qcow2
Block Commit: [100 %]

virsh # $DOMAIN var/lib/libvirt/images/snap1.qcow2 --abort

virsh # blockjob $DOMAIN /var/lib/libvirt/images/snap1.qcow2
No current block job for /var/lib/libvirt/images/snap1.qcow2


I´ve test this with qemu 2.1 and the problem does`nt exist.

/usr/bin/qemu-system-x86_64 -name $DOMAIN -S -machine pc-
i440fx-1.6,accel=kvm,usb=off -m 8192 -realtime mlock=off -smp
8,sockets=8,cores=1,threads=1 -uuid 30c49f37-6e62-49f6-a9df-ad2fef1fa312
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/$DOMAIN.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime
-no-shutdown -boot strict=on -device piix3-usb-
uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-serial-pci,id=virtio-
serial0,bus=pci.0,addr=0x6 -drive
file=/var/lib/libvirt/images/$DOMAIN.qcow2,if=none,id=drive-virtio-
disk0,format=qcow2 -device virtio-blk-
pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,id=virtio-
disk0,bootindex=1 -chardev pty,id=charserial0 -device isa-
serial,chardev=charserial0,id=serial0 -chardev
socket,id=charchannel0,path=/var/lib/libvirt/qemu/f16x86_64.agent,server,nowait
-device virtserialport,bus=virtio-
serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
-device usb-tablet,id=input0 -vnc 127.0.0.1:0 -k de -device
VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x5 -device virtio-balloon-
pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on


Compiled against library: libvirt 1.2.11
Using library: libvirt 1.2.11
Using API: QEMU 1.2.11
Running hypervisor: QEMU 2.1.2


virsh # snapshot-create-as --domain windows.trohde-snapshot-test 
windows.trohde-snapshot-test_snap1 --diskspec 
vda,file=/var/lib/libvirt/images/windows.trohde-snapshot-test_snap1.qcow2 
--quiesce --disk-only --atomic --no-metadata
Domain snapshot windows.trohde-snapshot-test_snap1 created

virsh # blockcommit $DOMAIN vda --active --verbose --pivot
Block Commit: [100 %]
Successfully pivoted

Cheers

Tim

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: blockcomit qemu snapshot

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https://bugs.launchpad.net/bugs/1455475

Title:
  Block Commit: [100 %]error: failed to pivot job for disk vda

Status in QEMU:
  New

Bug description:
  Hi,

  i´ve a Problem with committing a snapshot. The problem was discussed
  on the libvirt mailing list earlier this year.

  https://www.redhat.com/archives/libvirt-
  users/2015-January/msg00029.html

  
  Iam running gentoo and:

  Compiled against library: libvirt 1.2.14
  Using library: libvirt 1.2.14
  Using API: QEMU 1.2.14
  Running hypervisor: QEMU 2.3.0

  I´am running a Windows Server 2012 R2 VM with the latest quest driver
  (0.1.96) and  QEMU quest Agent 0.12.1 installed.

  The domain is started with following command line:

  /usr/bin/qemu-system-x86_64 -name $DOMAIN -S -machine 
pc-i440fx-1.6,accel=kvm,usb=off -m 8192 -realtime mlock=off -smp 
8,sockets=8,cores=1,threads=1 -uuid c96ef576-dbfc-49aa-9dd0-068886c4ef0e 
-no-user-config -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/$DOMAIN.monitor,server,nowait 
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime 
-no-shutdown -boot strict=on -device 
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device 
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive 
file=/var/lib/libvirt/images/$DOMAIN.qcow2,if=none,id=drive-virtio-disk0,format=qcow2
 -device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
 -netdev tap,fd=25,id=hostnet0,vhost=on,vhostfd=26 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:07:b4:0a,bus=pci.0,addr=0x3 
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 
-chardev 
socket,id=charchannel0,path=/var/lib/libvirt/qemu/f16x86_64.agent,server,nowait 
-device 
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
 -device usb-tablet,id=input0 -vnc 127.0.0.1:6 -k de -device 
VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x5 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on
  char device redirected to /dev/pts/2 (label charserial0)

  
  I´ve created the snapshot with:

  virsh # snapshot-create-as --domain $DOMAIN snap1 --diskspec 
vda,file=/var/lib/libvirt/images/snap1.qcow2 --quiesce --disk-only --atomic 
--no-metadata
  Domain snapshot snap1 created

  If i try to commit the snapshot i get this error:

  virsh # blockcommit $DOMAIN vda --active --verbose --pivot
  error: internal error: unable to execute QEMU command 'block-commit': Device 
'drive-virtio-disk0' is busy: block device is in use by block job: commit

  
  virsh # blockjob $DOMAIN /var/lib/libvirt/images/snap1.qcow2
  Block Commit: [100 %]

  virsh # $DOMAIN var/lib/libvirt/images/snap1.qcow2 --abort

  virsh # blockjob $DOMAIN /var/lib/libvirt/images/snap1.qcow2
  No current block job for /var/lib/libvirt/images/snap1.qcow2

  
  I´ve test this with qemu 2.1 and the problem does`nt exist.

  /usr/bin/qemu-system-x86_64 -name $DOMAIN -S -machine pc-
  i440fx-1.6,accel=kvm,usb=off -m 8192 -realtime mlock=off -smp
  8,sockets=8,cores=1,threads=1 -uuid 30c49f37-6e62-49f6-a9df-
  ad2fef1fa312 -no-user-config -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/$DOMAIN.monitor,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime
  -no-shutdown -boot strict=on -device piix3-usb-
  uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-serial-pci,id
  =virtio-serial0,bus=pci.0,addr=0x6 -drive
  file=/var/lib/libvirt/images/$DOMAIN.qcow2,if=none,id=drive-virtio-
  disk0,format=qcow2 -device virtio-blk-
  pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,id=virtio-
  disk0,bootindex=1 -chardev pty,id=charserial0 -device isa-
  serial,chardev=charserial0,id=serial0 -chardev
  
socket,id=charchannel0,path=/var/lib/libvirt/qemu/f16x86_64.agent,server,nowait
  -device virtserialport,bus=virtio-
  serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
  -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -k de -device
  VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x5 -device virtio-balloon-
  pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on


  Compiled against library: libvirt 1.2.11
  Using library: libvirt 1.2.11
  Using API: QEMU 1.2.11
  Running hypervisor: QEMU 2.1.2

  
  virsh # snapshot-create-as --domain windows.trohde-snapshot-test 
windows.trohde-snapshot-test_snap1 --diskspec 
vda,file=/var/lib/libvirt/images/windows.trohde-snapshot-test_snap1.qcow2 
--quiesce --disk-only --atomic --no-metadata
  Domain snapshot windows.trohde-snapshot-test_snap1 created

  virsh # blockcommit $DOMAIN vda --active --verbose --pivot
  Block Commit: [100 %]
  Successfully pivoted

  Cheers

  Tim

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