Bug 1993308

Eric, can you post the backport to 8.4.z?

Thanks

Hi Eric,

Can you please confirm which batch update this bug will be targeted for?

Thanks.

We need to know if this will be available in the next 8.4.z update, so we can
require a version with the fix for RHV 4.4.9.

Patches posted downstream:
https://mailman-int.corp.redhat.com/archives/rhvirt-patches/2021-September/msg00069.html

Test on qemu-kvm-5.2.0-16.module+el8.4.0+13043+9eb47245.11, the problem has been resolved.

Test Env:
  Kernel version:4.18.0-305.el8.x86_64
  qemu-kvm version:qemu-kvm-5.2.0-16.module+el8.4.0+13043+9eb47245.11

Test Steps:
 1.Create a qcow2 image
   #qemu-img create -f qcow2 /home/data.qcow2 2G

 2.Add a persistent bitmap offline
   #qemu-img bitmap /home/data.qcow2 --add bitmap_persistent

 3.Expose the persistent bitmap via qemu-nbd
   #qemu-nbd -t -p 10098 /home/data.qcow2 -B bitmap_persistent

 4.Kill qemu-nbd
   #kill -9 $pid_qemu_nbd

 5.Check image info of data.qcow2
   # qemu-img info /home/data.qcow2 
image: /home/data.qcow2
file format: qcow2
virtual size: 2 GiB (2147483648 bytes)
disk size: 324 KiB
cluster_size: 65536
Format specific information:
    compat: 1.1
    compression type: zlib
    lazy refcounts: false
    bitmaps:
        [0]:
            flags:
                [0]: in-use
                [1]: auto
            name: bitmap_persistent
            granularity: 65536
    refcount bits: 16
    corrupt: false
    extended l2: false

  6.Add a new persistent bitmap to /home/data.qcow2
    #qemu-img bitmap /home/data.qcow2 --add bitmap_add

  7.Check image info of /home/data.qcow2
    #qemu-img info /home/data.qcow2 
image: /home/data.qcow2
file format: qcow2
virtual size: 2 GiB (2147483648 bytes)
disk size: 452 KiB
cluster_size: 65536
Format specific information:
    compat: 1.1
    compression type: zlib
    lazy refcounts: false
    bitmaps:
        [0]:
            flags:
                [0]: in-use
                [1]: auto
            name: bitmap_persistent
            granularity: 65536
        [1]:
            flags:
                [0]: auto
            name: bitmap_add
            granularity: 65536
    refcount bits: 16
    corrupt: false
    extended l2: false

 8.Convert image with all bitmaps
   #qemu-img convert -O qcow2 /home/data.qcow2 /home/test/data_new.qcow2 --bitmaps
qemu-img: Cannot copy inconsistent bitmap 'bitmap_persistent'
Try --skip-broken-bitmaps, or use 'qemu-img bitmap --remove' to delete it

 9.Convert image with inconsistent bitmap skipped.
   #qemu-img convert -O qcow2 /home/data.qcow2 /home/test/data_new.qcow2 --bitmaps --skip-broken-bitmaps
qemu-img: warning: Skipping inconsistent bitmap 'bitmap_persistent'

 10.Check image info of converted image
   #qemu-img info /home/test/data_new.qcow2 
image: /home/test/data_new.qcow2
file format: qcow2
virtual size: 2 GiB (2147483648 bytes)
disk size: 324 KiB
cluster_size: 65536
Format specific information:
    compat: 1.1
    compression type: zlib
    lazy refcounts: false
    bitmaps:
        [0]:
            flags:
                [0]: auto
            name: bitmap_add
            granularity: 65536
    refcount bits: 16
    corrupt: false
    extended l2: false

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: virt:av and virt-devel:av security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:4112