[Bug 235524] ethernet interface loses active link state

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235524

            Bug ID: 235524
           Summary: ethernet interface loses active link state
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: denis at h3q.com

my machine uses an igb interface for pppoe to a dsl-modem. after some load on
the interface (max 16mbit) the link state changes to DOWN.

sometimes using "ifconfig pppoe0 down" and then "ifconfig pppoe0 up" helps but
mostly not and the only solution is to reboot the machine.

Every aspect of involved hardware changed over the years but the problems
persists.

funny thing is that the link goes active if I run "ifconfig pppoe0 down". but
as soon as I run "ifconfig pppoe0 up" the link state goes to inactive.

first messages in var/log/message when this happens:

Feb  4 16:20:14 monolith kernel: igb3: TX(0) desc avail = 42, pidx = 876
Feb  4 16:20:15 monolith kernel: pppoe0: link state changed to DOWN

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