[Bug 239240] igb: TX(2) desc avail = 1024, pidx = 0 messages appear when the network card loses ethernet link

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239240

--- Comment #9 from 76nemo76 at gmx.ch ---
After compiling the Prerelease 12.1, the problem is a little bit different. As
somebody else has noticed, when the network card is disconnected the connection
seems to work for quite a long time (about 30 minutes in my longest test).

But if you unplug the network switch for longer (one night for instance), a
similar but different message (this time it is about a watchdog) is displayed.

The message produced is:
igb0: Watchdog timeout (TX: 0 desc avail: 1024 pidx: 0) -- resetting

Is it possible to suppress the watchdog?

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