When reporting bugs, please always use the latest version of QEMU, old versions like 2.1 are not supported anymore. I just also noticed that Stefan Hajnoczi replied to the bug mail on the qemu-devel mailing list (see https://www.mail-archive.com/qemu-devel@nongnu.org/msg422186.html) - seems like the bridge did not mirror this to the bug tracker:
"QEMU image compression uses the compression feature available in some disk image formats (like qcow2). This is not the same as compressing a file with gzip, bzip2, or similar tools. Therefore this error is expected and not a bug." ** Changed in: qemu Status: New => Invalid -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1655764 Title: qemu-img convert -c compression can't decompress Status in QEMU: Invalid Bug description: Used -c compression option of qemu-img convert to compress qcow2, then libvirt mount for compressed image don't work as well as decompression also not working, tried zlib-flate to decompress To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1655764/+subscriptions