[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 #8 from 76nemo76 at gmx.ch ---
Finally I have compiled and installed FreeBSD Prerelease 12.1. A little bit
long and painful (about 14 hours of compilation). 

The results are better now. It seems that if the cable is disconnected from the
machine or the network switch is unplugged the connection is no more lost.

However, when passing the command "ifconfig -a" the network card (where the
cable is disconnected) is still marked as active. To see the igb0 card no more
marked as "active", I have to pass the commands (this card is a member of a
bridge)
                   1) ifconfig bridge0 down
                   2) ifconfig igb0 down
                   3) ifconfig -a indicates yet that the connection
                                  is no more "active"
                   3) ifconfig igb0 up
                   4) ifconfig bridge0 up

Since someone has indicated that after a while when the cable is disconnected
the probleam is present again, I have to do more check before being certain
that this problem is really solved.

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