[Bug 216881] zpool detach hangs if autoexpand is set to on.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216881

            Bug ID: 216881
           Summary: zpool detach hangs if autoexpand is set to on.
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jmc-freebsd2 at milibyte.co.uk
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

FreeBSD curlew.lan 11.0-RELEASE-p2 FreeBSD 11.0-RELEASE-p2 #0: Mon Oct 24
06:55:27 UTC 2016    
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

zpool detach hangs and eventually freezes the entire system if autoexpand is
set to on.

After rebooting the detached device is still shown in the pool but is
inaccessible and cannot be removed

For example, starting with this pool:

        root at fbsd11:~ # zpool status

        pool: test
        state: ONLINE
        scan: resilvered 74.5K in 0h0m with 0 errors on Mon Feb  6 13:55:04
2017
        config:

                NAME            STATE     READ WRITE CKSUM
                test            ONLINE       0     0     0
                mirror-0      ONLINE       0     0     0
                        gpt/ztest1  ONLINE       0     0     0
                        gpt/ztest2  ONLINE       0     0     0

        errors: No known data errors

        root at fbsd11:~ # zpool get autoexpand

        NAME  PROPERTY    VALUE   SOURCE
        test  autoexpand  on      local

If I attempt to detach test gpt/ztest2 it hangs and after rebooting I have the
following:

        root at fbsd11:~ # zpool status

        pool: test
        state: DEGRADED
        status: One or more devices could not be opened.  Sufficient replicas
exist for
                the pool to continue functioning in a degraded state.
        action: Attach the missing device and online it using 'zpool online'.
                see: http://illumos.org/msg/ZFS-8000-2Q
        scan: resilvered 74.5K in 0h0m with 0 errors on Mon Feb  6 13:55:04
2017
        config:

                NAME                      STATE     READ WRITE CKSUM
                test                      DEGRADED     0     0     0
                mirror-0                DEGRADED     0     0     0
                        gpt/ztest1            ONLINE       0     0     0
                        12467057712079289495  UNAVAIL      0     0     0  was
/dev/gpt/ztest2

        errors: No known data errors

At this stage the former gpt/ztest2 cannot be detached or reattached until I
set autoexpand to off which then enables me to detach it.

A similar problem was resolved with FreeNAS in November and might be relevant -
https://bugs.pcbsd.org/issues/14337

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