[libvirt-users] Libvirt newer than 2.1.0 doesnt start up

[Laine Stump]

On 10/19/2016 01:58 AM, Michal Privoznik wrote:
> On 17.10.2016 22:32, Rene Pasing wrote:
>> Hi all,
>>
>> I have some problems with libvirt >2.1.0 (so 2.2.0 and 2.3.0): I have a
>> working environment using libvirt 2.1.0 with 1 domain (called "mail")
>> and one network (called "default6"), both are autostarted. I have no
>> problems with this environment using libvirt 2.1.0, everything works great.
>>
>> But after (testwise) updating to libvirt 2.2.0 or 2.3.0, libvirt doesn't
>> start up anymore.
>>
>> Some investigations showed that apparently my "default6" network is the
>> problem. Libvirt is starting correctly after disabling all autostarts.
>> When I then virsh' into the system daemon and type "net-start default6",
>> then nothing happens and that command just hangs infinitely.
>>
>> Further information, relevant log entries and e.g. the used default6.xml
>> configuration file can be found here, as I first thought it would be a
>> configuration error from my side:
>> https://bbs.archlinux.org/viewtopic.php?pid=1653221
>>
>> Do you maybe have an idea what could be going on? Or do you maybe need
>> more information, and if yes, which exactly?
> Those "Network is already in use by interface virbr1" error messages
> worry me. Is the bridge active before you start libvirtd? If so we might
> be losing netowrk state XML (or fail to parse it) and thus think network
> is not started and because of autostart we try to start it again (which
> fails).

My suspicion was that error happens during a 2nd attempt to start the 
network when libvirtd has already hung once while trying to start the 
network, and was killed, thus preventing proper cleanup of a 
half-started network.