[Bug 235524] igb ethernet interface loses active link state

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235524

eborisch+FreeBSD at gmail.com changed:

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                 CC|                            |eborisch+FreeBSD at gmail.com

--- Comment #1 from eborisch+FreeBSD at gmail.com ---
I'm running into this as well, no pppoe involved. Everything is up and running
just fine until (on Friday evening of Memorial day weekend, of course) ...

May 24 21:28:03 <host> kernel: igb0: TX(0) desc avail = 42, pidx = 574
May 24 21:28:03 <host> kernel: igb0: link state changed to DOWN
May 24 21:28:05 <host> kernel: igb0: TX(3) desc avail = 1024, pidx = 0
May 24 21:28:35 <host> syslogd: last message repeated 18 times

Can't try net/intel-em-kmod as this is an I350 card:

igb0 at pci0:4:0:0:        class=0x020000 card=0x152115d9 chip=0x15218086 rev=0x01
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'I350 Gigabit Network Connection'
    class      = network
    subclass   = ethernet

After it decides there is no carrier (lights go out on physical card, too)
rebooting is the only way I've found to wake back up.

Running amd64 12.0-p3 at the time. Custom kernel config, but comes up and is
stable until this occurs. Doesn't *seem* to be during high traffic, but I
suppose there could have been an undetected (looking at monitoring data) spike
right before it happened. (This was the interface the monitoring data is sent
out, so....)

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