These KVM test appliance images are designed to be used with the kvm-xfstests system which can be found here: git://git.kernel.org/pub/scm/fs/ext2/xfstests-bld.git If you are testing a 32-bit x86 kernel you must use the root_fs.img.i386. If you are using a 64-bit kernel, you may use either the i386 or x86_64 root_fs.img file. Information on how to use these images can be found at the Quick Start guide, located at: https://github.com/tytso/xfstests-bld/blob/master/Documentation/kvm-quickstart.md The "corresponding source" of the GPL binaries found in these KVM images can be found in the source packages for the Debian distribution's Jessie and Jessie-backports release as of January 23, 2017: http://snapshot.debian.org/archive/debian/20170123T152343Z/ ... as well as the following git repositories: e2fsprogs v1.43.4-42-g00b010e7 (Sun, 5 Feb 2017 21:08:45 -0500) fio fio-2.17-1-g54441e7 (Wed, 18 Jan 2017 08:18:28 -0700) quota 2b37958 (Tue, 9 Aug 2016 19:17:56 +0200) xfsprogs v4.9.0-1-g07d66eb (Sat, 7 Jan 2017 23:27:26 -0500) xfstests-bld b5b3526 (Tue, 7 Feb 2017 12:56:21 -0500) xfstests linux-v3.8-1365-g892733a (Sun, 5 Feb 2017 20:15:01 -0500) The gen-image script found in the kvm-xfstests/test-appliance directory of the xfstests-bld git repository, plus Debian jessie's debootstrap, constitutes the scripts used to control the creation of these KVM images. Local changes to xfstests can be found at: https://github.com/tytso/xfstests release-2017-02-07-892733ab https://github.com/tytso/xfsprogs release-2017-02-07-07d66eb9 The URL's for the other git repositories and scripts to download the sources from those repositories can be found in xfstests-bld's scripts.