[Bug 240944] em(4): Crash with Intel 82571EB NIC with AMD Piledriver and Steamroller APUs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240944

--- Comment #13 from Kevin Bowling <kbowling@freebsd.org> ---
(In reply to Ace from comment #12)
> ecap 0001[100] = AER 1 0 fatal 1 non-fatal 2 corrected

You have some fatal PCI errors occurring on the card, and that looks consistent
with the other pciconf reports..  just to start with a low effort guess can you
try disabling PCI Link Power management (ASPM) and/or AER (advanced error
reporting) in the system's firmware and see what happens?

Beyond that there are a number of relevant errata we may need to check off in
the driver to see if we are missing some mitigation
http://iommu.com/datasheets/e1000-datasheets/82571eb-82572ei-gbe-controller-spec-update.pdf
the above two firmware changes stand out to me as eliminating some possible
issues.

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