[Bug 214946] zfs autoexpand seems to be not working in 11 and above

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214946

            Bug ID: 214946
           Summary: zfs autoexpand seems to be not working in 11 and above
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tsoome at freebsd.org

After expanding the disk for VM and using gpart resize, and setting
autoexpand=on the pool does still not getting added space:

# zpool list
NAME    SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
zroot  13.9G  11.5G  2.34G        4G    71%    83%  1.00x  ONLINE  -

# zpool get autoexpand
NAME   PROPERTY    VALUE   SOURCE
zroot  autoexpand  on      local

# zpool export zroot
# zpool list
no pools available
# zpool import -N zroot
# zpool list
NAME    SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
zroot  13.9G  11.5G  2.35G        4G    71%    83%  1.00x  ONLINE  -

no change. however:

# zpool reopen zroot
# zpool list
NAME    SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
zroot  17.9G  11.5G  6.34G         -    55%    64%  1.00x  ONLINE  -

but the interesting fact is, this session is done from cd boot; when zroot was
booted from, even zpool reopen did not trigger the resize.

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