The test failure looks like a problem in libguestfs (or maybe qemu) rather than nbdkit.
TBH in Fedora we disable nbdkit tests on 32-bit armv7, 32-bit i686 and all POWER: https://src.fedoraproject.org/rpms/nbdkit/blob/44518f07e0b28a799fa683f1f5ec2ca9c000ac01/f/nbdkit.spec#_419 Now that's not because they shouldn't work eventually, it's because we don't routinely test nbdkit upstream on these architectures. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top