Description of problem:
mounting an encrypted intel bios raid array hangs after the following updates :
mdadm-3.2.6-1.fc18.x86_64 to mdadm-3.2.6-12.fc18.x86_64

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

How reproducible:
100%

Steps to Reproduce:
1. install fc18 on server with existing array (that was running fc17).
2. update the mdadm package
3. try to mount filesystem
  
Actual results:
mount command hangs. no errors in any logs.

Expected results:
filesystem should mount

Additional info:
i can opens the luks device ok. other info that may be useful :

mdadm -D /dev/md127
/dev/md127:
        Version : imsm
     Raid Level : container
  Total Devices : 4

Working Devices : 4


           UUID : 3936b762:57f0fc35:dcb179b9:f5bb1675
  Member Arrays : /dev/md/Volume0_0

    Number   Major   Minor   RaidDevice

       0       8       32        -        /dev/sdc
       1       8       48        -        /dev/sdd
       2       8       64        -        /dev/sde
       3       8       16        -        /dev/sdb

mdadm -D /dev/md126
/dev/md126:
      Container : /dev/md/imsm0, member 0
     Raid Level : raid5
     Array Size : 2930280448 (2794.53 GiB 3000.61 GB)
  Used Dev Size : 976760320 (931.51 GiB 1000.20 GB)
   Raid Devices : 4
  Total Devices : 4

          State : active 
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-asymmetric
     Chunk Size : 64K


           UUID : 67651b3e:5d9144be:c79d629e:f907af03
    Number   Major   Minor   RaidDevice State
       3       8       16        0      active sync   /dev/sdb
       2       8       32        1      active sync   /dev/sdc
       1       8       48        2      active sync   /dev/sdd
       0       8       64        3      active sync   /dev/sde

/etc/crypttab 
luks-7425e393-21ac-4f25-be4a-458eb968aaaf UUID=7425e393-21ac-4f25-be4a-458eb968aaaf none

/etc/fstab
/dev/mapper/luks-7425e393-21ac-4f25-be4a-458eb968aaaf  /data      ext4    defaults,x-systemd.device-timeout=0 1 2

dumpe2fs -h /dev/dm-4
dumpe2fs 1.42.5 (29-Jul-2012)
Filesystem volume name:   <none>
Last mounted on:          /data
Filesystem UUID:          6c305a06-927c-438c-ad4d-9ba5e84acaec
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              183148544
Block count:              732569563
Reserved block count:     36628478
Free blocks:              404976428
Free inodes:              182924049
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      849
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
RAID stride:              16
RAID stripe width:        48
Flex block group size:    16
Filesystem created:       Sat Jan 28 05:03:11 2012
Last mount time:          Sun Feb  3 12:50:06 2013
Last write time:          Sun Feb  3 12:50:06 2013
Mount count:              15
Maximum mount count:      23
Last checked:             Mon Jan 28 20:14:15 2013
Check interval:           15552000 (6 months)
Next check after:         Sat Jul 27 21:14:15 2013
Lifetime writes:          5224 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      13f95ee5-1ba6-4574-8351-c305c5e32a53
Journal backup:           inode blocks
Journal features:         journal_incompat_revoke
Journal size:             128M
Journal length:           32768
Journal sequence:         0x007ae9d8
Journal start:            1