Bug#924349: linux-image-4.19.0-2-amd64: IPv6 reverse path filtering incorrectly removes IPv6 traffic from bridge

[Salvatore Bonaccorso <carnil@debian.org>]

Hi Ralf,

On Mon, Mar 11, 2019 at 10:43:48PM +0100, Ralf Jung wrote:
> Package: src:linux
> Version: 4.19.16-1
> Severity: normal
> 
> Dear Maintainer,
> 
> since a recent update, IPv6 communication between two of my VMs stopped working.
> You can see some of the debugging effort at
> <https://bugzilla.redhat.com/show_bug.cgi?id=1680681>.  It turned out that
> setting IPv6_rpfilter=no in /etc/firewalld/firewalld.conf fixes the problem---so
> the ip6tables reverse path filtering is incorrectly dropping packets here.
> 
> A self-compiled upstream 4.20.14 kernel does not show this problem, but the
> latest kernel in testing still does.

have you tried to isolate the fixing commit for this issue?

Regards,
Salvatore