bird 3.1.5 crashes after adding "-R" to BIRD_ARGS

[Maria Matejka]

On Mon, Jan 05, 2026 at 03:35:43PM +0100, Christoph via Bird-users wrote:

> Some more lines from the logfile suggests an issue with netlink performance?
> 
> 2026-01-05 01:16:00.367 [0001] <WARN> Netlink: File exists << many times
> [...]
> 2026-01-05 01:16:44.093 [0001] <WARN> kernel1: Can't scan, still pruning

This is more likely a synchronization bug. Will check though.

> 2026-01-05 01:22:42.408 [0001] <BUG> kernel1.ipv4: Attempted to start
> channel's already started export
> 2026-01-05 01:24:21.910 [0001] <BUG> kernel1.ipv4: Attempted to start
> channel's already started export

And this is even more suspicious. Will check whether it's possible to
reproduce that from this description and get back to you if i need more
information from you.

> net.core.rmem_max=16777216
> net.core.rmem_default=4194304
> net.core.wmem_max=4194304
> 
> Are these still sensible values or should they be increased further?
> This is a BGP router getting 2 full tables.

BIRD 3 should be _faster_ doing this, not slower. If you need to update
these values, it's definitely _our_ bug.

Maria

-- 
Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://trubka.network.cz/pipermail/bird-users/attachments/20260105/ae2566f0/attachment.htm>