[Bug 213372] Repartitioning existing disk does not work

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213372

            Bug ID: 213372
           Summary: Repartitioning existing disk does not work
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bz at austonley.org.uk

Existing 1 Tb Toshiba 3.5" SATA partitioned with 11RC3
932G GPT
512KB freebsd-boot
920GB freebsd-ufs as /
12GB freebsd-swap

11RELEASE DVD (the final version) in USB drive.  Motherboard (ASRock
Q1900TM-ITX) offers USB and UEFI options to boot drive.  Select USB.  Select UK
ISO-8859-1 option which tests OK except for the usual missing £ sign.

Select Manual partioning.
Delete swap and / partitions.
Select Create

Add partition dialog appears immediately overlain by Error dialog saying there
is no / partition etc.
Accept Yes to continue.

Both dialogs are cleared and the entire free space is occupied by a 932GB UFS
partition.  Attempting to modify this does not permit modification to size.

Alternatively select the EUFI option for the DVD drive and proceed as before
with the partition table reverted.

Enter 600GB as the size for the root partition.

There was an error dialog complaining about lack of a bootable partition. 
Accept the offer to add this and it ignores the existing freebsd-boot partition
and adds an EFI partition followed by the new UFS partiton

The new partition table shows the UFS partition as 0.3TB.

Select Modify.  The Modify dialog showns the partition as -300GB (not exactly
-300 but I didn't note the two least significant digits).

Deleted this and tried creating a 0.6TB partition.  T is not accepted.

Deleted again and tried adding a 300GB partition which is displayed as 0.7TB

If I attempt to add a third partition the sizing looks sane enough but with the
insane size being shown I'm not prepared to commit this.

I still have the original partitions set up if you want me to experiment.

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