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e0622ca281
The libxl driver is racy in it's interactions with libxl and libvirt's event loop. The event loop can invoke callbacks after libxl has deregistered the event, and possibly access freed data associated with the event. This patch fixes the race by converting libxlDomainObjPrivate to a virObjectLockable, and locking it while executing libxl upcalls and libvirt event loop callbacks. Note that using the virDomainObj lock is not satisfactory since it may be desirable to hold the virDomainObj lock even when libxl events such as reading and writing to xenstore need processed.
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>