On Mon, Oct 16, 2023 at 07:20:06AM +0700, Bagas Sanjaya wrote: > On Sun, Oct 15, 2023 at 09:56:14PM +0200, Vladimir Smelhaus wrote: > > Netfilter ignores the timeout settings for a flowtable > > > > # sysctl -a -r flowtable > > net.netfilter.nf_flowtable_tcp_timeout = 30 > > net.netfilter.nf_flowtable_udp_timeout = 30 > > > > Situation. A long udp connection (tunnel) with some data flowing through a > > router. The connection is sent to a flowtable on the router. It's a few > > packets per second, more here and there, a pause here and there, and so on > > over and over. The pauses are minimal and are also limited by the tunnel > > settings to be no longer than 25 seconds. Everything is satisfying to make > > the connection last continuously in the flowtable and not reappear in > > forward. However, the connection keeps dropping out of the flowtable. It > > stays in the flowtable (offloaded) for a second at most and then it is > > kicked out, back to forward. > > > > In an attached test script you can see counters that should be zero but are not. If I watch the normal packet flow on a particular router, I can see packets in the conntrack table that should be OFFLOAD as ASSURED. > > > > Tested in kernel 6.5.6. In an old(er) kernel 5.10 it works as expected. > > > > Then please perform bisection to find a culprit that introduces your > regression (see Documentation/admin-guide/bug-bisect.rst in the kernel > sources for reference). Also, it'd been great if you also post the > reproducer script inline (within your email) instead, as some MUAs > (like mutt that I'm using now) may ignore the attachment. > > Anyway, thanks for the regression report. I'm adding it to regzbot: > > #regzbot ^introduced: v5.10..v6.5 Fix here: https://patchwork.ozlabs.org/project/netfilter-devel/patch/20231024193815.1987-1-pablo@xxxxxxxxxxxxx/ it is a bug from Jun 2023, regression was introduced in the v6.5 development cycle. Thanks for reporting.
