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Bug
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Resolution: Not a Bug
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Undefined
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None
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rhel-10.1
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None
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None
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None
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rhel-virt-core-libvirt-1
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None
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False
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False
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None
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None
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None
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None
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Unspecified
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Unspecified
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Unspecified
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None
What were you trying to do that didn't work?
No VM I/O error occurs during migration when the image size exceeds the disk size
Please provide the package NVR for which bug is seen:
libvirt-11.5.0-4.1.el10_1.x86_64
qemu-kvm-10.0.0-14.el10_1.x86_64
How reproducible:
100%
Steps to reproduce
1. Prepare a small local disk on src host. Create nfs server on it and mount the nfs dir on both src and dest host.
On src host: # truncate -s 30M /var/tmp/test.disk # losetup /dev/loop0 /var/tmp/test.disk # losetup -l NAME SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE DIO LOG-SEC /dev/loop0 0 0 0 0 /var/tmp/test.disk 0 512 # mkfs.ext4 /dev/loop0 # mount /dev/loop0 /mnt # exportfs -v /var/lib/avocado/data/avocado-vt/images <world>(async,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash) /mnt <world>(async,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash) # mkdir /nfs # mount -t nfs 127.0.0.1:/mnt /nfs -o rw,soft,timeo=15,retrans=3 # Create an image(larger than 30M). # qemu-img create -f qcow2 /nfs/100M.qcow2 100M Formatting '/nfs/100M.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=104857600 lazy_refcounts=off refcount_bits=16 On dest host: # mkdir /nfs # mount -t nfs <source host ip>:/mnt /nfs -o rw,soft,timeo=15,retrans=3
2. Prepare the VM.
# virsh dumpxml vm1 --xpath //disk <disk type="file" device="disk"> <driver name="qemu" type="qcow2" cache="none" io="native" discard="unmap"/> <source file="/var/lib/libvirt/migrate/vm1.qcow2" index="2"/> <backingStore/> <target dev="vda" bus="virtio"/> <alias name="virtio-disk0"/> <address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/> </disk> <disk type="file" device="disk"> <driver name="qemu" type="qcow2" cache="none" error_policy="stop"/> <source file="/nfs/100M.qcow2" index="1"/> <backingStore/> <target dev="vdb" bus="virtio"/> <alias name="virtio-disk1"/> <address type="pci" domain="0x0000" bus="0x07" slot="0x00" function="0x0"/> </disk>
3. Migrate VM.
# virsh migrate vm1 --live --p2p --verbose --desturi qemu+tcp://<dest host ip>/system --abort-on-error
Migration: [100.00 %]
Expected results:
Migration failed and error message:
error: operation failed: job 'migration out' failed due to I/O error
Actual results:
Migration successfully.
Additional info:
1. After migration, Vm running on dest host. Login the VM and check disk.
# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS vda 252:0 0 10G 0 disk ├─vda1 252:1 0 600M 0 part /boot/efi ├─vda2 252:2 0 1G 0 part /boot └─vda3 252:3 0 8.4G 0 part ├─rhel-root 253:0 0 7.4G 0 lvm / └─rhel-swap 253:1 0 1G 0 lvm [SWAP] vdb 252:16 0 100M 0 disk
2. Formatting vdb failed. And the VM status changed to paused.
# mkfs.ext4 /dev/vdb
