[Bug 229829] [zfs] scrubbing prevents shutdown and slows down startup

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229829

            Bug ID: 229829
           Summary: [zfs] scrubbing prevents shutdown and slows down
                    startup
           Product: Base System
           Version: 11.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: d8zNeCFG at aon.at

Scenario 1:
- FreeBSD 11.2
- UFS root fs
- 6 x 1.5 TB SATA disks in RAIDZ2 pool
- The pool is being scrubbed
- Issue "shutdown -p now"

Actual result 1:
- The system shuts down, shows that UFS fs has been synced
- The system continues scrubbing (in what appears to be right after all "usual"
kernel log messages) and does not power off

Expected result 1:
- The system stops scrubbing and powers off

Scenario 2:
- Continued from scenario 1
- Press hard reset button
- The system starts booting into multi-user

Actual result 2:
- As soon as the pool is imported, scrubbing continues
- As a result, system startup is extremely slow, the UFS fs check does not
finish in a reasonable time

Expected result 2:
- Scrubbing should not continue right with pool import
- System startup should be normal speed

Scenario 3:
- Continued from scenario 2
- Press hard reset button
- Boot system single user
- Run "fsck -p" in an effort to fix the UFS fs first; is successful
- Run "zpool list status"

Actual result 3:
- The system starts scrubbing the pool immediately
- As a result, "zpool list status" does not finish for a long time (actual
duration can be given later)

Expected result 3:
- Scrubbing should not continue right with the pool import
- zpool import and zpool list status should continue with normal speed

In summary, I believe that the solution is that before shutdown, all scrubbing
activities should be paused. Similarly, on boot any pool marked for scrubbing
should be treated as if scrubbing were paused on it.

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