[Bug 241069] zfs: scrub does not detect all errors on active spares

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241069

            Bug ID: 241069
           Summary: zfs: scrub does not detect all errors on active spares
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

This is a partial regression of https://www.illumos.org/issues/8473, which I
fixed in illumos rev 554675e (FreeBSD 323813).  Previously, ZFS scrub would
never detect errors on active spares.  Now, it detects some of them, but not
all.  The problem can be reproduced with the
hotspare_test:hotspare_scrub_002_pos test from the ZFS test suite, or by these
commands:

truncate -s 64m /tmp/a /tmp/b /tmp/c /tmp/d
sudo zpool create -f testpool raidz1 /tmp/a /tmp/b /tmp/c spare /tmp/d
sudo zpool replace testpool /tmp/a /tmp/d
/bin/dd if=/dev/zero bs=1024k count=63 oseek=1 conv=notrunc of=/tmp/d
sync
sudo zpool scrub testpool
zpool status testpool # Will show only a few errors
sudo zpool offline testpool /tmp/a
sudo zpool scrub testpool
zpool status testpool # Will show new errors!!!

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