[Bug 229986] Virtualbox + zfs scrub + gstat leads to deadlock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229986

            Bug ID: 229986
           Summary: Virtualbox + zfs scrub + gstat leads to deadlock
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: d8zNeCFG at aon.at

Scenario:
- Machine recently upgrade to 11.2, but with https://reviews.freebsd.org/D7538
because of excessive swapping
- Machine with raidz2 pool with 6 1.5 TB partitions
- Machine acts as VirtualBox host to a FreeBSD 11.2 client
- Run "zpool scrub" on the pool
- Run vbox with 11.2 client
- Shut down the client with "shutdown -p now" (from within the client)
- In another terminal window, gstat is running

Result:
- Gstat hangs
- vbox client hangs at the very end (power down not executed)

Expected result:
- Gstat should continue running
- Vbox client should stop executing

Scenario continued:
- Pause the scrub with "zpool scrub -p"

Result:
- After a few seconds, gstat continues and the vbox client terminates

This behavior is 100% reproducible and did not happen with 11.1.

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