This bug has been copied from bug #598488 and has been proposed to be backported to 5.5 z-stream (EUS).
Reproduced on kvm-83-164.el5_5.10, and verified pass on kvm-83-164.el5_5.11. Steps: 1.Create a disk on *RHEL6* host #qemu-img create -f qcow2 -ocluster_size=512 test.qcow2 1G 2.Copy this disk to RHEL5 host #/usr/libexec/qemu-kvm test.qcow2 -monitor stdio -vnc :10 (qemu)savevm aaa (qemu)savevm bbb (qemu)info snapshots (qemu)quit 3.#qemu-img check test.qcow2 On kvm-83-164.el5_5.10: [root@dhcp-91-161 home]# qemu-img check test2.qcow2 ERROR cluster 134400 refcount=0 reference=1 ERROR cluster 134467 refcount=2 reference=1 ERROR cluster 134468 refcount=2 reference=1 ERROR cluster 134656 refcount=0 reference=1 ERROR cluster 134723 refcount=2 reference=1 ERROR cluster 134724 refcount=2 reference=1 ERROR cluster 134725 refcount=2 reference=1 ERROR cluster 135936 refcount=0 reference=1 ERROR cluster 136072 refcount=2 reference=1 ERROR cluster 136073 refcount=2 reference=1 ERROR cluster 136192 refcount=0 reference=1 ERROR cluster 136328 refcount=2 reference=1 ERROR cluster 136329 refcount=2 reference=1 ERROR cluster 136330 refcount=2 reference=1 14 errors were found on the image. On kvm-83-164.el5_5.11: [root@dhcp-91-161 home]# qemu-img check testing.qcow2 No errors were found on the image.
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-2010-0479.html