FreeBSD 11.0-RC3 failed on hyper-v 2012r2

[Alexander Shitov]

I've found that FreeBSD 11.0-RC3 failed to install on hyperv 2012r2 on
disk partitioning step

------------------------Abort-----------------
|Partitioning error                          |
|                                            |
|An installation step has been aborted. Would|
|you like to restart the installation or exit|
|the installer?                              |
    <Restart>     <Exit>                     |
---------------------------------------------
Any thoughts?

Relevant bug https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212721