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https://bugzilla.redhat.com/show_bug.cgi?id=892079 One of my previous patches (f2a4e5f176c408) tried to fix crashing libvirtd on domain detroy. However, we need to copy pattern from qemuProcessHandleMonitorEOF() instead of decrementing reference counter. The rationale for this is, if qemu process is dying due to domain being destroyed, we obtain EOF on both the monitor and agent sockets. However, if the exit is expected, qemuProcessStop is called, which cleans both agent and monitor sockets up. We want qemuAgentClose() to be called iff the EOF is not expected, so we don't leak an FD and memory. Moreover, there could be race with qemuProcessHandleMonitorEOF() which could have already closed the agent socket, in which case we don't want to do anything.
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>