On 20/06/2019 17:13, Benedikt Neuffer wrote: > Hi, > > On 19.06.19 20:09, Alarig Le Lay wrote: >> Hi, >> >> On mer. 19 juin 09:10:53 2019, Robert Sander wrote: >>> Hi, >>> >>> our routers run on Debian stretch with bird 1.6.4 from >>> bird.network.cz/debian. >>> >>> Yesterday I tried kernel 4.19 from backports.debian.org and ran into a >>> weird issue with IPv6 BGP sessions: >>> >>> All Peerings reported "Error: Hold timer expired" ca. every 40 minutes. >>> >>> IPv6 forwarding was flapping all the time. >>> >>> After rebooting into kernel 4.9 everything worked again. >>> >>> IPv4 BGP was not affected and also OSPF (v4 and v6). I could disable all >>> IPv6 BGP peerings on this router and then it forwarded to another router >>> learned via OSPF for IPv6 without issues. >>> >>> Has anyone seen such a behaviour? >> >> I’ve seen this with 4.19 on gentoo. For now I’m still running 4.14. >> https://archives.gentoo.org/gentoo-user/message/fab628cc53e4a55589410f9dff6abd23 >> > > Same here. Gentoo, Linux 4.19.52, Bird 2.0.4. I am running a full table > using a separate VRF and the default table as management VRF. > > Without traffic through the box (all IPv6 prefixes filtered) the bgp > sessions is stable. With traffic the bgp session dies after some time > and ssh connections in the default table freezes. > > I did some packet captures and saw tcp retransmissions before hold timer > expires. > > Kernel 4.14.127 is here stable, too. Sadly I have no time for a kernel > bisect until September. (And no glue where to start and how to trigger > the bug faster.)
Sorry to bring up a fairly old thread... We believe we are seeing this problem too, since a Stretch->Buster upgrade - was there a solution to this? Thanks Andrew.