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Ad pointed out by Dan Berrange: So if some thread in libvirtd is currently executing a logging call, while another thread calls virExec(), that other thread no longer exists in the child, but its lock is never released. So when the child then does virLogReset() it deadlocks. The only way I see to address this, is for the parent process to call virLogLock(), immediately before fork(), and then virLogUnlock() afterwards in both parent & child. This will ensure that no other thread can be holding the lock across fork(). * src/util/logging.[ch] src/libvirt_private.syms: export virLogLock() and virLogUnlock() * src/util/util.c: lock just before forking and unlock just after - in both parent and child.
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>