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I noticed this while auditing all calls to virCommandRun that request an exit status from virCommandRun. Two functions in the openvz driver openvzDomainGetBarrierLimit openvzDomainSetBarrierLimit request an exit status from virCommandRun (thus assuring that virCommandRun won't log any errors just due to a non-0 exit status), but then fail to examine that exit status. This could result in the functions believing that the call to "vzlist" was successful, even though it may have encountered an error.
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>