[Bug 276870] mbuf cluster leak with on pf+bird2 bgp routers

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276870

Gleb Smirnoff <glebius@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |melifaro@FreeBSD.org

--- Comment #3 from Gleb Smirnoff <glebius@FreeBSD.org> ---
On Wed Feb  7 15:25:11  2024 UTC, thomas@gibfest.dk wrote:
> Over the holidays I upgraded from bird 2.0.9 to bird 2.14, as well as upgrading
> FreeBSD from 13-STABLE-384a885111ad to 13-STABLE-2cbd132986a7. I suspect one of
> these two changes made this problem appear. I made no changes to bird or router
> config other than the upgrades.

What I would suspect here is NETLINK. Lots of stuff merged between
384a885111ad and 2cbd132986a7.

Thomas, is it possible for you to work more on isolating the regression?

Things to check:
1) Did bird upgrade 2.0.9 to 2.14 switch bird to use NETLINK instead of
   route socket?

If 1) is false, there are two options: 2.0.9 and 2.14 both used NETLINK
or both used route socket. If the latter, than my guess is totally wrong
and Mark's guess is much better. If the former, than we need to bisect
between 384a885111ad and 2cbd132986a7.

2) If 1) is true, then please compile 2.14 with NETLINK disabled and
   check if leak has gone.

If 1) and 2) are true it could be the problem was in 384a885111ad
as well, but you did not use NETLINK.

3) Check if running with NETLINK on 384a885111ad reproduces the leak
   or not? (Be careful, as lots of bugs were removed after 384a885111ad)

Depending on 3) we may need to run bisection.

Anyway, please keep us updated when you got more info, starting with 1).

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