[Bug 209443] [Hyper-V]FreeBSD 10.3 on Windows 2012 server may fail to add/remove a disk by hot plugin

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209443

            Bug ID: 209443
           Summary: [Hyper-V]FreeBSD 10.3 on Windows 2012 server may fail
                    to add/remove a disk by hot plugin
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: honzhan at microsoft.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

FreeBSD 10.3 on windows 2012 R2 hyper-v may fail to hot add/remove a SCSI disk.
The reproduce steps are:
1. boot the system
2. add a vhd disk through hyperv manager settings: From SCSI Controller, add a
new virtual hard disk, select vhd and 1G size. Finally click "Apply"
3. From the hyperv manager console, we can see a new disk is added.
4. repeat the above step 2 and 3 twice to add two disks, but you can only see
one hot plugin disk. The first hot plugin disk is missing.

If you use "camcontrol rescan <bus:target:lun>" to rescan the missing device,
it will go back. But if you used this command issue twice rescan, the disk may
miss again.

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