[Bug 210417] Reproducible igb related panic 11.0-ALPHA4

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210417

            Bug ID: 210417
           Summary: Reproducible igb related panic 11.0-ALPHA4
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rpp at ci.com.au
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 171625
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=171625&action=edit
crashino core.txt.1

Kernel panics within a few seconds with heavy network load. Using "iperf -c
another_host" is sufficient to induce the problem. Setting hw.igb.enable_msix=0
in loader.conf "solves" the problem. The problem occurs on at least 2 similar
machines with same motherboards. Hradware is Asus P9D C224 with integrated
<Intel(R) PRO/1000 Network Connection, Version - 2.5.3-k.
crashino core.txt.1 attached.

--Richard

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