Create Raid6 with 1 missing member fails

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I tried to create a raid6 with one missing member, but it fails.
It works fine to create a raid6 with two missing members. Is it supposed to be like that ?

mdadm -C /dev/md0 -n5 -l6 -c256 /dev/sd[bcde]1 missing
raid5: failed to run raid set md0
mdadm: RUN_ARRAY failed: Input/output error
mdadm: stopped /dev/md0

mdadm --version
mdadm - v2.6.4 - 19th October 2007
uname -a
Linux compaq2.lan 2.6.23.15-137.fc8 #1 SMP Sun Feb 10 17:03:13 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

mdadm --examine /dev/sdb1
/dev/sdb1:
         Magic : a92b4efc
       Version : 00.90.00
          UUID : e4147673:e22e02ac:09e8c875:b3e364c1
 Creation Time : Sun Feb 17 14:31:55 2008
    Raid Level : raid6
 Used Dev Size : 488295424 (465.67 GiB 500.01 GB)
    Array Size : 1464886272 (1397.02 GiB 1500.04 GB)
  Raid Devices : 5
 Total Devices : 5
Preferred Minor : 0

   Update Time : Sun Feb 17 14:31:55 2008
         State : active
Active Devices : 4
Working Devices : 4
Failed Devices : 1
 Spare Devices : 0
      Checksum : d9c93170 - correct
        Events : 0.1

    Chunk Size : 256K

     Number   Major   Minor   RaidDevice State
this     0       8       17        0      active sync   /dev/sdb1

  0     0       8       17        0      active sync   /dev/sdb1
  1     1       8       33        1      active sync   /dev/sdc1
  2     2       8       49        2      active sync   /dev/sdd1
  3     3       8       65        3      active sync   /dev/sde1
  4     4       0        0        4      faulty

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