[Bug 1524697] [NEW] wrong --detail --test

[Constantine Shulyupin]

Public bug reported:

Degradation in 3.2 to 3.3.4, last working 3.2.6.

mdadm --detail  --test returns 0 on for degraded array, when only the
second of two disks is removed, works as expected when the first disk
removed.

Expected:
  --test        -t   : exit status 0 if ok, 1 if degrade, 2 if dead, 4 if missing

Expected:
mdadm --detail  /dev/md2 --test ; echo $?
/dev/md2:
        Version : 1.2
  Creation Time : Thu Dec 10 11:50:20 2015
     Raid Level : raid1
     Array Size : 780226240 (744.08 GiB 798.95 GB)
  Used Dev Size : 780226240 (744.08 GiB 798.95 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Thu Dec 10 11:50:22 2015
          State : active, degraded 
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : A1
           UUID : 333592b4:40d92ae2:9cf82398:b92d466e
         Events : 24

    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1       8       34        1      active sync   /dev/sdc2
1
^^ not a bug

Bug:

mdadm --detail  /dev/md1 --test ; echo $?
/dev/md1:
        Version : 1.2
  Creation Time : Thu Dec 10 11:39:41 2015
     Raid Level : raid1
     Array Size : 780226240 (744.08 GiB 798.95 GB)
  Used Dev Size : 780226240 (744.08 GiB 798.95 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Thu Dec 10 11:42:35 2015
          State : active, degraded 
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : A1
           UUID : 6a29c716:b804f9f3:3519867f:32f98380
         Events : 32

    Number   Major   Minor   RaidDevice State
       0       8       18        0      active sync   /dev/sdb2
       2       0        0        2      removed
0
^^^ BUG

** Affects: mdadm (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1524697

Title:
  wrong --detail  --test

Status in mdadm package in Ubuntu:
  New

Bug description:
  Degradation in 3.2 to 3.3.4, last working 3.2.6.

  mdadm --detail  --test returns 0 on for degraded array, when only the
  second of two disks is removed, works as expected when the first disk
  removed.

  Expected:
    --test        -t   : exit status 0 if ok, 1 if degrade, 2 if dead, 4 if missing

  Expected:
  mdadm --detail  /dev/md2 --test ; echo $?
  /dev/md2:
          Version : 1.2
    Creation Time : Thu Dec 10 11:50:20 2015
       Raid Level : raid1
       Array Size : 780226240 (744.08 GiB 798.95 GB)
    Used Dev Size : 780226240 (744.08 GiB 798.95 GB)
     Raid Devices : 2
    Total Devices : 1
      Persistence : Superblock is persistent

    Intent Bitmap : Internal

      Update Time : Thu Dec 10 11:50:22 2015
            State : active, degraded 
   Active Devices : 1
  Working Devices : 1
   Failed Devices : 0
    Spare Devices : 0

             Name : A1
             UUID : 333592b4:40d92ae2:9cf82398:b92d466e
           Events : 24

      Number   Major   Minor   RaidDevice State
         0       0        0        0      removed
         1       8       34        1      active sync   /dev/sdc2
  1
  ^^ not a bug

  Bug:

  mdadm --detail  /dev/md1 --test ; echo $?
  /dev/md1:
          Version : 1.2
    Creation Time : Thu Dec 10 11:39:41 2015
       Raid Level : raid1
       Array Size : 780226240 (744.08 GiB 798.95 GB)
    Used Dev Size : 780226240 (744.08 GiB 798.95 GB)
     Raid Devices : 2
    Total Devices : 1
      Persistence : Superblock is persistent

    Intent Bitmap : Internal

      Update Time : Thu Dec 10 11:42:35 2015
            State : active, degraded 
   Active Devices : 1
  Working Devices : 1
   Failed Devices : 0
    Spare Devices : 0

             Name : A1
             UUID : 6a29c716:b804f9f3:3519867f:32f98380
           Events : 32

      Number   Major   Minor   RaidDevice State
         0       8       18        0      active sync   /dev/sdb2
         2       0        0        2      removed
  0
  ^^^ BUG

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