[Bug 274926] Problem with netwokr card, and when restart network, crash system

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274926

--- Comment #8 from Olivier Cochard <olivier@freebsd.org> ---
To sum up, there are 2 problems here:
1). The root cause: After network cable disconnect, the negotiated speed is 10
Mbps in place of 1Gbps.

Notice there are multiple reports of this same 10Mbps negotiation bug (after
sleep or disconnection) on Linux with same chipset. Power management seems to
be the culprit on Linux:
https://bugzilla.redhat.com/show_bug.cgi?id=1627816

And the Linux patches that solved it are:

e1000e: PCIm function state support:
https://lkml.kernel.org/netdev/20190628224932.3389-16-jeffrey.t.kirsher@intel.com/

e1000e: Make speed detection on hotplugging cable more reliable
https://lkml.kernel.org/netdev/309B89C4C689E141A5FF6A0C5FB2118B970D75A2@ORSMSX103.amr.corp.intel.com/T/


2). The second bug with netif restart that trigger a panic, and the text
version of the core dump is requested to get more clue about this one.

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