[Bug 197989] gpart(8) can't define start for new partition

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197989

            Bug ID: 197989
           Summary: gpart(8) can't define start for new partition
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: timp87 at gmail.com

Hi! There is a problem with gpart(8) in some cases.

I have HP Proliant server with smart array raid controller (ciss driver).
Sometimes gpart(8) can't define the start of a new partition that I want to
add.

Here is an example:

Two disks build into one mirror using HP Smart Array.
# gpart create -s gpt da0
da0 created

# gpart add -t freebsd-ufs -s 512k da0
ad0p1 added

# gpart show
=>  40   286677040   da0   GPT (137G)
    40         752         - free - (376K)
    792       1024     1   freebsd-ufs (512K)
   1816  286675264         - free - (137G)

# gpart add -t freebsd-ufs -s 512k da0
gpart: start '792': No space left on device

What? But I have free space on device. And why gpart(8) tries to add new
partition from 792? I already have such partition. It should start from 1816!

Same story with MBR scheme, with 10.1-STABLE and 10.1-RELEASE.

Looks like gpart(8) is buggy.

FreeBSD 11.0-CURRENT amd64 r279210 (from 2015-02-23)

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