After updating 'mdadm' package system fails to boot

Issue

• The system is using mdraid array for root volume group and /boot filesystem. After updating the mdadm rpm to version 3.3.4-8.el6, system is failing to boot with following errors:

  dracut Warning: LVM rootvg/root not found
  dracut Warning: LVM rootvg/root not found
  
  Dropping to debug shell.
  
  sh: can't access tty; job control turned off
  dracut:/# cat /proc/mdstat
  Personalities :
  unused devices: <none>
  

• However we are able to manually assemble the mdraid array from dracut prompt as shown below and system boots up properly. The same issue was not observed with previous version of mdadm rpm:

  dracut:/# IMSM_NO_PLATFORM=1 mdadm --assemble /dev/md0 /dev/sdb /dev/sdc
  md: md0 stopped.
  md: bind<sdc>
  md: bind<sdb>
  mdadm: Container /dev/md0 has been assembled with 2 drives
  
  dracut:/# IMSM_NO_PLATFORM=1  mdadm -A /dev/md/Volume0 /dev/md0
  md: md126 stopped.
  md: bind<sdb>
  md: bind<sdc>
  md: raid1 personality registered for level 1
  bio: create slab <bio-1> at 1
  md/raid1:md126: active with 2 out of 2 mirrors
  md126: detected capacity change from 0 to 480099958784
   md126: p1 p2
  md: md126 switched to read-write mode.
  mdadm: Started /dev/md/Volume0 with 2 devices
  
  dracut:/# ls -l /dev/root
  ls: cannot access /dev/root: No such file or directory
  
  dracut:/# lvm vhchange -ay rootvg
  File descriptor 9 (/.console_lock) leaked on lvm invocation. Parent PID 2344: sh
    8 logical volume(s) in volume group "rootvg" now active
  
  dracut:/# ls -l /dev/root
  lrwxrwxrwxx 1 0 root 4 Sep 19 12:46 /dev/root -> dm-0
  dracut:/# 
  dracut:/#