[Bug 254341] igb hung every 5-20 hours. ifconfig down+up solves the problem for next N hours

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254341

--- Comment #8 from Vladislav Shabanov <vlad.shabanov at gmail.com> ---
Bad news:
At 15:00 I turned off all options (-rxcsum -rxcsum6 ...) and left the machine
alone. At 20:05 the NIC hung again. 

Now I can reproduce the hung using sequence of 
   ifconfig bge0 txcsum6 ; ifconfig bge0 -txcsum6
   ifconfig bge0 something-else; ifconfig bge0 -something-else;

After 5-6 calls network dies. 

Alas, I can reproduce the problem, but I still have no workaround. The only
solution is  watchdog script pinging other host and ifconfig down/up.

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