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This bug has been copied from bug #635354 and has been proposed
to be backported to 6.0 z-stream (EUS).

Verified this issue on
# uname -r
2.6.32-71.3.1.el6_0.x86_64
# rpm -q qemu-kvm
qemu-kvm-0.12.1.2-2.113.el6_0.2.x86_64

backing-image (block_device with qcow2 format) -->pass
backing-image (block_deivce with raw format) -->pass
backing-image (file with qcow2 format) --> pass
backing-image (file with raw format) ---> pass


based on above ,this issue has already been fixed.

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Previously, attempting to commit a copy-on-write image to a raw backing disk image using the "quemu-img commit" command may have failed with the following error:

  qemu-img: Error while committing image

With this update, this error no longer occurs, and such images can now be committed as expected.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2010-0855.html