Deadlocks when using pf tags or socket owner matching

[Kristof Provost]

On 8 Jul 2020, at 12:52, Kajetan Staszkiewicz wrote:
> I have forgot to mention my system: it's FreeBSD 11.3-RELEASE-p9
>
> I have also managed to replicate this (or a similar) issue on a test
> system built with lock debugging and I got this:
>
> Jul  8 10:32:07 hwlb-aw-01 kernel: lock order reversal:
> Jul  8 10:32:07 hwlb-aw-01 kernel: 1st 0xffffffff81850760 pf rulesets
> (pf rulesets) @
> /usr/home/kajetan.staszkiewicz/freebsd.git/sys/netpfil/pf/pf.c:6006
> Jul  8 10:32:07 hwlb-aw-01 kernel: 2nd 0xfffff8011f7028a8 tcpinp
> (tcpinp) @
> /usr/home/kajetan.staszkiewicz/freebsd.git/sys/netinet/in_pcb.c:1994

This lock order reversal is almost certainly the reason for the deadlock 
you report in your previous e-mail.

The problem relates to the UID filtering functionality, so not using 
that feature will avoid the deadlock.
I believe I’ve seen previous reports about issues in this area as 
well.

I’ll try to put this on my short-sh term todo list, but I can’t 
promise anything. Free time is exceptionally rare these days.

Best regards,
Kristof