Description of problem:

When installing FC7, I had a disk partition with 3 primary partitions and 1
extended partition. After the last (primary) partition there was a lot of free
space. I didn't at first realize that I had in effect the maximum number of
partitions, so I pointed to this free space when choosing mount points and
designated it as a new partition (ext3).
When I entered "OK" however, in stead of a remark, that the disk already had the
maximum number of (primary or extended) partitions, Anaconda crashed.
I repeated this, when I had found what the problem was: the crash is repeatable.

When I deleted one of the primary partitions I could designate the free space
fine. From that point on I could continue the install without problems.

Version-Release number of selected component (if applicable):
It is Anaconda from the DVD for installing FC7 on a x86_64 system.
The disk brand is (I guess) unimportant.

How reproducible:
Have a disk with 4 primary partitions or (as in my case) 3 primary partitions
plus one extended partition -- plus enough free space following the last primary
partition.

Steps to Reproduce:
1. Install FC7
2. Choose custom adapting the partitions
3. keep all primary and extended partition and designate the free space as a new
partition.
  
Actual results:
Anaconda crashes with a bugtrace.

Expected results:
Anaconda remarks on the maximum number of primary or extended partitions.
Possibly some extra verbal explanation using an example or something like that.
Not a crash.

Additional info:
None.