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BZ:https://bugzilla.redhat.com/show_bug.cgi?id=871273 when using virsh qemu-attach to attach an existing qemu process, if it misses the -M option in qemu command line, libvirtd crashed because the NULL value of def->os.machine in later use. Example: /usr/libexec/qemu-kvm -name foo \ -cdrom /var/lib/libvirt/images/boot.img \ -monitor unix:/tmp/demo,server,nowait \ error: End of file while reading data: Input/output error error: Failed to reconnect to the hypervisor This patch tries to set default machine type if the value of def->os.machine is still NULL after qemu command line parsing.
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>