[Bug 231166] 11.1->11.2 Update brings em network link state flapping

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231166

--- Comment #3 from steven_nikkel at ertyu.org ---
Weird behaviour today. I left the cable unplugged over night. Plugged it in
this morning and the interface worked properly. It worked fine for an hour
while I watched and poked at it, passed IPv6 packets fine, picked up IPv4 DHCP,
forgot to test otherwise. Then I downed the realtek interface and things seemed
to stop working on the intel interface as well. Downed and upped the intel
interface and it came back to life, but the link state flapping started again.
Trying all the usual things isn't making it go away again either.

Per Compri, I am using 64bit OS, not seeing Interrupt Storm messages, don't
think it's interrupt rate related as there is hardly any traffic flowing when
this starts, but I did try upping the setting, which had no effect.

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