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0e1f616
(Get the code!)
I tested this on Xenial, Artful and Bionic.
In Bionic and Artful it breaks as shown before:
error: Failed to start domain bg
error: An error occurred, but the cause is unknown
In Xenial as well - it just takes much longer.
So this is at least not a regression.
Note: the feature itself is rather old, since [1] (2012)
Still all I see is:
Apr 20 09:14:21 b libvirtd[4207]: Warning: Kernel filter failed: Bad file descriptor
Apr 20 09:14:21 b libvirtd[4207]: 4379: error : virNWFilterSnoo
With debug enabled the log does not hold more info.
The code in that area prepares (compile) and sets the filters.
The handle is created with handle = pcap_create(ifname, pcap_errbuf);
And several operations succeed on that handle before the pcap_setfilter fails eventually.
I wondered if this might be due to my KVM-in-LXD setup and tried X/B on Bare metal, to the same effect/error.
For this case one would need to debug libvirtd to find what is going on, I'm not sure yet this works/worked anywere (since even latest release is broken atm).
For now I'm waiting on a confirmation if there is a known fix (or not) before considering debugging it deeper. If there is no known fix an outline of the important/urgency from the reporters POV would be nice. Given that this seems to never worked I'll rate it rather low for now.
[1]: https:/