[Bug 233895] 12.0-RC2: Repeated double fault on AWS r4.large

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233895

            Bug ID: 233895
           Summary: 12.0-RC2: Repeated double fault on AWS r4.large
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: leif at ofWilsonCreek.com

Created attachment 199989
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=199989&action=edit
Screenshot of panic.

I'm testing 12.0-RC2 on AWS, and getting double-fault panics. We've observed it
at least 3 times, with a stop/start between each, and on two hosts (the only
hosts we have on 12). A stop/start should move it to new host hardware,
eliminating the plausibility of bad hardware. The last release that has been
stable for us is 11.1. (11.2 did not work on AWS due to the crash bug in ena.)
This happens on an r4.large instance (r4.large is large enough to use the ena
NIC driver rather than xn, fwiw).

Screenshot from AWS attached.

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