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Description of problem:
when backend is block device, create a qcow2 format image, will got error hint as "Header extension too large".
Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.475.el6.x86_64
How reproducible:
Sometimes
Steps to Reproduce:
1.using qemu-img to create a qcow2 format image.
e.g:
# qemu-img create -f qcow2 /dev/iscsi-juli/disk1.qcow2 1G
Formatting '/dev/iscsi-juli/disk1.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536
Header extension too large
/dev/iscsi-juli/disk1.qcow2: error while creating qcow2: Invalid argument
2.
3.
Actual results:
# qemu-img create -f qcow2 /dev/iscsi-juli/disk1.qcow2 1G
Formatting '/dev/iscsi-juli/disk1.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536
Header extension too large
/dev/iscsi-juli/disk1.qcow2: error while creating qcow2: Invalid argument
Expected results:
Create this qcow2 format image successfully.
Additional info:
Workaround:
1, write zero to this block devcie.
# dd if=/dev/zero of=/dev/iscsi-juli/disk1.qcow2 bs=4k count=1
2, create qcow2 format image, will success.
# qemu-img create -f qcow2 /dev/iscsi-juli/disk1.qcow2 1G
Formatting '/dev/iscsi-juli/disk1.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536
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, 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://rhn.redhat.com/errata/RHBA-2016-0815.html