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

[Tim Rohde]

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

[Tim Rohde (t-rohde)]

There are 2 Bug reports in the redhat bugzilla already.

https://bugzilla.redhat.com/show_bug.cgi?id=1210903

https://bugzilla.redhat.com/show_bug.cgi?id=1197592

i would say, we can close this bug here to avoid double work.

Cheers Tim

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Rafael David Tinoco (rafaeldtinoco)]

Upstream "fixed" the issue - by finishing "block-commit" - in v1.3. That is why I'm marking this bug as a duplicate of the Ubuntu bug. I'll provide more comments in that bug.