11.2-RC3 regression - networking igb driver

[David Samms]

There is a regression in 11.2-RC3 that effects the igb driver for Intels
C2000 SoC I354 Quad GbE Controller

Supermicro A1SRi-2558F
http://www.supermicro.com/products/motherboard/Atom/X10/A1SRi-2558F.cfm

This server has run 10.x and 11.x fine up till 11.2-RC3.

PROBLEM:
with 11.2-RC3 the server boots and gets a network connection to the
cable modem, but the interface (igb0) resets every 4-8 second. The reset
time appears to be related to network load, but reset withing 10s with
next to no traffic. I did try swapping cables, but with no effect. With
each reset the interface successfully obtains an IP address via DHCP,
works for a few seconds and resets.

Restoring the server to 11.1-RELEASE-p10 resolves the problem.

Any suggestions?
--
David Samms
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