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If a guest image is saved in compressed format, and the restore fails in some way after the intermediate process used to uncompress the image has been started, but before qemu has been started to hook up to the uncompressor, libvirt will endlessly wait for the uncompressor to finish, but it never will because it's still waiting to have something hooked up to drain its output. The solution is to close the pipes on both sides of the uncompressor, then send a SIGTERM before calling waitpid on it (only if the restore has failed, of course).
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>