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+
+qemu-img will fail to convert images in 2.3.0
+
+Hello guys,
+
+    There seems to be a bug in qemu-img with 2.3.0 that wasn't there in 2.2.1  .... qemu convert will always fail converting.  See the output below:
+
+
+Started by upstream project "Create windows image" build number 73
+originally caused by:
+ Started by user anonymous
+Building remotely on builder (builder lab) in workspace /var/lib/jenkins/remote/workspace/Prepare windows Image
+[Prepare WS2008R2 Image] $ /bin/sh -xe /tmp/hudson4138890034689910617.sh
++ sudo bash -x /var/images/prepare_windows.sh WS2008R2
++ set +x
+
+Preparing: windows
+Virtio CD: virtio-win-0.1.96.iso
+
+Sparsifying...
+qemu-img: error while compressing sector 11131648: Input/output error
+virt-sparsify: error: external command failed: qemu-img convert -f 
+qcow2 -O 'qcow2' -c -o 'compat=0.10' '/tmp/sparsifyb459a0.qcow2' 
+'/var/images/generated/WS2008R2.qcow2'
+
+virt-sparsify: If reporting bugs, run virt-sparsify with debugging 
+enabled (-v) and include the complete output.
+Build step 'Execute shell' marked build as failure
+Warning: you have no plugins providing access control for builds, so falling back to legacy behavior of permitting any downstream builds to be triggered
+Finished: FAILURE
+
+Thanks,
+Dave
+
+I can't reproduce this.  qemu-img convert works just fine here.
+
+qemu-img convert -f qcow2 -O qcow2 -c -o compat=0.10 x.img y.img
+
+(from a random winXP guest image).
+
+The only possibly relevant change I can see in 2.3 is that the qcow2 driver added an additional error check to a truncate operation. Can you please run qemu-img under strace -f and either provide the output as an attachment or paste the relevant failing call(s) if you can recognise them?
+
+I rolled back QEMU to 2.2.1 and it succeeded converting the image ...   I'll try to see if I can re-upgrade QEMU without breaking again the CI we have here.
+
+This problem is fixed with commit 3e5feb62 ("qcow2: Handle EAGAIN returned from update_refcount"), which will be included in qemu 2.4.0.
+