[Bug 225960] zfs: g_access leak when unmounting UFS on a zvol

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225960

            Bug ID: 225960
           Summary: zfs: g_access leak when unmounting UFS on a zvol
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

Sometimes a g_access leak can be triggered by creating a UFS filesystem on a
zvol, and then unmounting it.  The result is a zvol whose geom mode is r0w0e2,
even though it has no consumers.  The zvol cannot be destroyed, and neither can
its parent pool.  Rebooting solves the problem.  While not 100% reproducible,
this problem is frequently reproduced by the
sys/cddl/zfs/tests/cli_root/zfs_copies/zfs_copies_test:zfs_copies_001_pos test
from the ZFS test suite.

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