Red Hat Bugzilla – Bug 1254927
qemu-img shows Input/output error when compressing guest image
Last modified: 2015-12-04 11:53:55 EST
Description of problem: qemu-img-rhev-2.3.0-18.el7.x86_64 and qemu-img-rhev-2.3.0-1.el7.x86_64, Both hit this issue. e.g # qemu-img convert -c -f qcow2 -O qcow2 /home/win7-64-bak.qcow2 /home/win7-64-bak-compress.qcow2 qemu-img: error while compressing sector 9263232: Input/output error Version-Release number of selected component (if applicable): qemu-img-rhev-2.3.0-18.el7.x86_64 3.10.0-304.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.# qemu-img info /home/win7-64-bak.qcow2 image: /home/win7-64-bak.qcow2 file format: qcow2 virtual size: 40G (42949672960 bytes) disk size: 26G cluster_size: 65536 Format specific information: compat: 0.10 refcount bits: 16 2.# qemu-img convert -c -f qcow2 -O qcow2 /home/win7-64-bak.qcow2 /home/win7-64-bak-compress.qcow2 qemu-img: error while compressing sector 9263232: Input/output error 3.# qemu-img info /home/win7-64-bak-compress.qcow2 image: /home/win7-64-bak-compress.qcow2 file format: qcow2 virtual size: 40G (42949672960 bytes) disk size: 2.0G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false 4.# qemu-img check /home/win7-64-bak-compress.qcow2 No errors were found on the image. 70497/655360 = 10.76% allocated, 98.46% fragmented, 97.99% compressed clusters Image end offset: 2147614720 Actual results: Expected results: Additional info:
Can you please grant access to the affected image? (or upload an image we can use to reproduce it).
Fixed upstream with 3e5feb6202149e8a963a33b911216e40d790f1d7, we'll see whether a backport for rhev-7.3.0 is needed or whether that commit will be included by rebase.
Fixed upstream, patch is simple, impact on customers is real.
Fix included in qemu-kvm-rhev-2.3.0-23.el7
Reproduced with qemu-kvm-rhev-2.3.0-15.el7.x86_64/ Steps: # qemu-img info win7-64-sp1-virtio.qcow2 image: win7-64-sp1-virtio.qcow2 file format: qcow2 virtual size: 30G (32212254720 bytes) disk size: 7.8G cluster_size: 65536 Format specific information: compat: 0.10 refcount bits: 16 # qemu-img convert -c -f qcow2 -O qcow2 /home/win7-64-sp1-virtio.qcow2 /home/win7-64-bak-compress.qcow2 qemu-img: error while compressing sector 9418752: Input/output error # qemu-img info win7-64-bak-compress.qcow2 image: win7-64-bak-compress.qcow2 file format: qcow2 virtual size: 30G (32212254720 bytes) disk size: 2.0G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false So this bug is reproduced. Verify this bug with qemu-kvm-rhev-2.3.0-24.el7.x86_64 Steps as above: # qemu-img convert -c -f qcow2 -O qcow2 /home/win7-64-sp1-virtio.qcow2 /home/win7-64-bak-compress1.qcow2 -p (100.00/100%) # qemu-img info win7-64-bak-compress1.qcow2 image: win7-64-bak-compress1.qcow2 file format: qcow2 virtual size: 30G (32212254720 bytes) disk size: 3.5G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false No error occurs, so this bug is fixed.
According to comment7, set this issue as verified.
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-2015-2546.html