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We need to drop the server lock before calling virObjectUnlock(client) since in case we had the last reference to the client, its dispose callback would be called and that could possibly try to lock the server and cause a deadlock. This is exactly what happens when there is only one QEMU domain running and it is marked to be autodestroyed when the connection dies. This results in qemuProcessAutoDestroy -> qemuProcessStop -> virNetServerRemoveShutdownInhibition call sequence, where the last function locks the server.
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>