[Bug 209580] ZFS and geli broken with INVARIANTS enabled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209580

            Bug ID: 209580
           Summary: ZFS and geli broken with INVARIANTS enabled
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: shawn.webb at hardenedbsd.org

On 10-STABLE/amd64 with INVARIANTS enabled, when a user attempts to do a new
installation with the ZFS wizard, selecting the option to encrypt the pool
causes a ZFS deadlock. The deadlock resolver (DEADLKRES) doesn't resolve this
deadlock.

The commit (from github) that I used to generate the new installation image:
8cc4bb22bd5b562b7e64f69904c876eb0146d170

This issue was originally reported to HardenedBSD:
https://github.com/HardenedBSD/hardenedBSD/issues/168

Steps to reproduce:
1. Generate a new installation cdrom image with GENERIC compiled with
INVARIANTS and INVARIANT_SUPPORT
2. Boot the cdrom image in bhyve
3. Attempt an installation with encrypted ZFS through the installer
4. Notice the deadlock

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