[Bug 222273] Kernel panic (fatal trap 12) due to network related processes (igb driver)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222273

            Bug ID: 222273
           Summary: Kernel panic (fatal trap 12) due to network related
                    processes (igb driver)
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: aayla.secura.1138 at gmail.com

Created attachment 186312
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=186312&action=edit
kgdb backtrace

The steps to getting it to panic are a bit elaborate, but the bug is
reproducible every time: If I stop the netif service, then run dhclient on the
wired network interface and in the meantime (while dhclient is sending discover
messages) I perform a network related operation, such as printing the routing
table, the kernel panics with Fatal trap 12: page fault while in kernel mode.

FreeBSD version is 11.0-RELEASE-p1.

It is a server machine: The CPU is Xeon E3-1275v6. The motherboard is Intel
DBS1200SPLR, it has two Ethernet ports, both using igb driver. I tried wiring
each and the panic occurs either way, but only if dhclient is run on the active
(plugged in) interface.

I attach the crash dump from one of the panics. The original forum thread I
opened is here: https://forums.freebsd.org/threads/62338/

The bug may be the same, or related, to this:
https://lists.freebsd.org/pipermail/freebsd-hackers/2017-June/051200.html

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