On Mon, Dec 09, 2013 at 09:17:28PM -0500, Chris Lalancette wrote: I'll make a comment here and copy it to the github issue tracker. When libguestfs sends files over the link between the appliance and the library (such as when running the guestfs_tar_out call), it sends 8 KByte chunks of data. If the library cannot read a chunk, it will print this error. The normal case would be that system call (eg read(2)) would fail. This is likely to be a "should never happen" issue, and this code is well tested. Oz calls guestfs_tar_out with the /dev/fd/NN parameter (there's nothing wrong with that). This explains why /dev/fd/NN is shown in the error message. The bug suggests that strace shows a problem with a file descriptor being closed, but without the complete strace output, plus the precise version of libguestfs, this is not useful. I can't really debug this further without knowing the precise version of libguestfs, the full strace output, and ideally having a reproducible bug report. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones 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