Mdadm –detail command is not displaying the state of a degraded md array as degraded

[NEEBA V V]

The problem is :
Mdadm –detail command is not displaying the state of an md array as degraded, when actually the array is in degraded state:
Expected behavious is State should be 'Clean,degraded' for a degraded md array.

OS : Ubuntu 14.04.3 LTS
Kernel : 4.2.0-23-generic
mdadm v. 3.2.5-5

1. Create a md array
# mdadm --create /dev/md500 -n2 -l1 /dev/disk/by-id/scsi-3644a84203ba22f001d6f5278428ed6e6 /dev/disk/by-id/scsi-3644a84203ba22f001d6f527d42d5713d
mdadm: Note: this array has metadata at the start and
    may not be suitable as a boot device. If you plan to
    store '/boot' on this device please ensure that
    your boot-loader understands md/v1.x metadata, or use
    --metadata=0.90
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md500 started.

# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md500 : active raid1 sdc[1] sdb[0]
      20955008 blocks super 1.2 [2/2] [UU]

unused devices: <none>

# mdadm --detail /dev/md500
/dev/md500:
        Version : 1.2
  Creation Time : Mon Feb 1 11:14:34 2016
     Raid Level : raid1
     Array Size : 20955008 (19.98 GiB 21.46 GB)
  Used Dev Size : 20955008 (19.98 GiB 21.46 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Mon Feb 1 11:16:19 2016
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : blrfsserv149:500 (local to host blrfsserv149)
           UUID : ff415711:f14f374c:b61831d4:0558303e
         Events : 17

    Number Major Minor RaidDevice State
       0 8 16 0 active sync /dev/sdb
       1 8 32 1 active sync /dev/sdc

2. Offline a device using scsi offline command
# echo 1 > /sys/bus/scsi/devices/0:2:1:0/delete

3. Check the mdadm --details, the state is still 'clean'
Expected behavious is State should be 'Clean,degraded'

# mdadm --detail /dev/md400
/dev/md400:
        Version : 1.2
  Creation Time : Mon Feb 1 17:36:08 2016
     Raid Level : raid1
     Array Size : 20955008 (19.98 GiB 21.46 GB)
  Used Dev Size : 20955008 (19.98 GiB 21.46 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Mon Feb 1 17:46:05 2016
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : blrfsserv149:400 (local to host blrfsserv149)
           UUID : 00728830:7dd439a9:e1abe1bf:d8ab91b5
         Events : 2

    Number Major Minor RaidDevice State
       0 8 16 0 active sync
       1 8 32 1 active sync /dev/sdc

[NEEBA V V (neeba-vv)]

I have observed that:
If md array is created with partitioned disk, the state change with array degrade is working as expected.
Verified with kernel 4.2.0-23-generic

1. Create md array with partitioned disk
# mdadm --detail /dev/md500
/dev/md500:
Version : 1.2
Creation Time : Mon Feb 15 16:17:59 2016
Raid Level : raid1
Array Size : 11709312 (11.17 GiB 11.99 GB)
Used Dev Size : 11709312 (11.17 GiB 11.99 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Mon Feb 15 16:19:55 2016
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Name : blrfsserv149:500 (local to host blrfsserv149)
UUID : d76dbca0:5ff06b36:8057cfde:96d9475b
Events : 17

Number Major Minor RaidDevice State
0 8 81 0 active sync /dev/sdf1
1 8 97 1 active sync /dev/sdg1

2. Offline the scsi device using scsi command
# lsscsi | grep sdf
[0:2:5:0] disk DELL PERC H730 Mini 4.25 /dev/sdf

# echo 1 > /sys/bus/scsi/devices/0:2:5:0/delete
# lsscsi | grep sdf

3. Check the details of md array, the state is changed from clean to clean,degraded
# mdadm --detail /dev/md500
/dev/md500:
Version : 1.2
Creation Time : Mon Feb 15 16:17:59 2016
Raid Level : raid1
Array Size : 11709312 (11.17 GiB 11.99 GB)
Used Dev Size : 11709312 (11.17 GiB 11.99 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent

Update Time : Mon Feb 15 16:21:02 2016
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0

Name : blrfsserv149:500 (local to host blrfsserv149)
UUID : d76dbca0:5ff06b36:8057cfde:96d9475b
Events : 20

Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 97 1 active sync /dev/sdg1