Description of problem:
f9 alpha x86_64 live cd : after partitioning scrren, partition table was not
changed by user but , after some other error, anaconda reports that it was
unable to inform the kernel about changes to /dev/sdb5. fortunately, it offers
the option to ignore the warning.

Version-Release number of selected component (if applicable):


How reproducible:
always

Steps to Reproduce:
1.select custom partitioning
2.don't modify the existing partitions, just assign a / and go further
3.
  
Actual results:
anaconda complains that it was unable to inform the kernel about modifications
to /dev/sdb5....

Expected results:
no errors

Additional info:
/dev/sdb5 is actually not used during instllation but, /dev/sdb6 (as it is seen
by anaconda) it is used as / ,and is the only used partition.

the output as seen by installed fedora{8,9_alpha} :

# fdisk -l

Disk /dev/sda: 250.0 GB, 250058268160 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000d7f52

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        1338    10747453+  83  Linux
/dev/sda2   *        1339        1351      104422+  83  Linux
/dev/sda3            1352        1476     1004062+  82  Linux swap / Solaris
/dev/sda4            1477       30401   232340062+   5  Extended
/dev/sda5            1477       20000   148794029+  83  Linux
/dev/sda6           20001       21338    10747484+  83  Linux
/dev/sda7           21339       30400    72790483+  83  Linux

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000379ab

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1       60801   488384001   83  Linux

anaconda switches sda and sdb .