Hello, I'm running bird 1.6.x branch (packages from Debian/Buster; currently 1.6.6) on recent 4.19 custom-build kernels without any issues (on armhf hardware). My BGP sessions are carrying only few routes (default + some more specifics). One idea that comes in my mind is default kernel limit for IPv6 routes in memory (sysctl net.ipv6.route.max_size); and such default is quite low for fullbgp/DFZ IPv6 deployments and it's still set to 4096 on Debian/Buster with stock kernels. Can people having issues with 4.19 kernels check sysctl mentioned above? - Daniel On 11/21/19 6:12 PM, Ondrej Zajicek wrote:
On Thu, Nov 21, 2019 at 04:09:24PM +0000, Andrew Hearn wrote:
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?
Perhaps try kernel 5.2.x or 5.3.x from buster-backports?