[Libguestfs] Release notes appendix for libguestfs 1.20 on Fedora 18

Daniel P. Berrange berrange at redhat.com
Thu Dec 13 13:57:00 UTC 2012

On Thu, Dec 13, 2012 at 01:53:24PM +0000, Richard W.M. Jones wrote:
> I'm just about to release libguestfs 1.20.  This appendix covers
> issues specific to Fedora 18.
> Fedora 18 defaults to using the libvirt attach-method, meaning that
> libvirt is used to create and manage the libguestfs appliance.  There
> are several benefits to this (see the full release notes).  You can
> switch back to the ordinary method (directly running qemu) at any time
> by doing:
>   export LIBGUESTFS_ATTACH_METHOD=appliance
> There is a bug in libvirt (or perhaps libnl, or somewhere else) which
> causes libvirtd to segfault occasionally:
>   https://bugzilla.redhat.com/show_bug.cgi?id=875741

This is jus a dup of the other similar BZ you filed


The flaw is netcf, using libnl APIs that are not threadsafe. It is trivially
demonstrated by just having 2 threads call netcf_init/netcf_close in

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