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Date:      Tue, 28 Apr 2020 01:46:49 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 235524] igb(4): Ethernet interface loses active link state
Message-ID:  <bug-235524-7501-m5aGFwlOjq@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-235524-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-235524-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235524

Mel Pilgrim <ports.maintainer@evilphi.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ports.maintainer@evilphi.co
                   |                            |m

--- Comment #7 from Mel Pilgrim <ports.maintainer@evilphi.com> ---
I believe this is still recurring, even on 12.1-R, and that pf is involved
somehow. Every few weeks, a server will go offline.  When I bring up the
management console, the link light is off and the console is full of errors
like this:

igb1: Watchdog timeout (TX: 2 desc avail: 42 pidx: 504) -- resetting
igb1: Watchdog timeout (TX: 2 desc avail: 1024 pidx: 0) -- resetting

With the first occurring once, then the second repeating every 2-3 seconds.

If I ifconfig down the interface, the watchdog timeout errors cease and the
link light comes on.  If I then ifconfig up the interface the link light go=
es
off again and the watchdog timeout errors resume.

Thus far, only rebooting fixes this state.

Anecdote: this behaviour seems to correlate to whether or not pf is in use.=
  I
have multiple of this exact hardware (Supermicro X11SSH-LN4F), some run pf,
some don't. The behaviour occurs on every machine running pf, and none of t=
he
ones not running pf.  It wasn't occurring on two machines for months, then =
pf
was enabled, and the behaviour started.  It was occuring on one of the mach=
ines
running pf, then pf was disabled, and after months it has not recurred.

I'm posting this here because the observation--the paradoxical if up/down
behaviour fixed only with a reboot--is the same, and I have machines running
12.x that do it, suggesting this has only been partially masked.

--=20
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