[Bug 261100] After update to FreeBSD 13 Stable ( stable/13 aef4a2f5a ) lagg0 stop receiving traffic

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 11 Jan 2022 09:02:05 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261100

            Bug ID: 261100
           Summary: After update to FreeBSD 13 Stable ( stable/13
                    aef4a2f5a ) lagg0 stop receiving traffic
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rpalov@e-card.bg

After we update one server from FreeBSD-CURRENT 13 r369433 to  stable/13
aef4a2f5a both lagg interfaces stop working.

One of them is in LACP mode other is in Failover mode.

Both interfaces are used as vlan parents. 

All native interfaces( laggport ) are ibg* .

When we replace failover lagg in vlan definition with native interface the
network is working. 

It can be reproduced if You include the native interface of the machine which
is proved as working, for example igb0, to lagg0 and  migrate ip configuration
from igb0 to lagg0, then try use the lagg0 as uplink of the machine. 

Cheers
Rumen

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