[Bug 2026889] [NEW] mdadm --remove does not remove failed component

[Andrei Caraman]

Public bug reported:

mdadm 4.2-0ubuntu2 on jammy:

mdadm doesn't remove failed components from raid1 device and returns a 0
exit code.  Using the actual device name instead of "failed" or
"detached" doesn't make a difference.

root at server:~# cat /proc/mdstat 
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sdc2[2] sda2[3] sdb2[4](F)
      975581912 blocks super 1.2 [2/2] [UU]
      bitmap: 1/2 pages [4KB], 262144KB chunk

md9 : active raid1 sdc1[2] sda1[0] sdb1[1](F)
      1046528 blocks super 1.2 [2/2] [UU]
 
unused devices: <none>
root at server:~# mdadm /dev/md9 -r detached 
root at server:~# mdadm /dev/md1 -r detached 
root at server:~# mdadm /dev/md9 -r failed
root at server:~# mdadm /dev/md1 -r failed
root at server:~# $?
0: command not found
root at server:~# cat /proc/mdstat 
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] 
md1 : active raid1 sdc2[2] sda2[3] sdb2[4](F)
      975581912 blocks super 1.2 [2/2] [UU]
      bitmap: 1/2 pages [4KB], 262144KB chunk

md9 : active raid1 sdc1[2] sda1[0] sdb1[1](F)
      1046528 blocks super 1.2 [2/2] [UU]
 
unused devices: <none>
root at server:~#

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

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Title:
  mdadm --remove does not remove failed component

Status in mdadm package in Ubuntu:
  New

Bug description:
  mdadm 4.2-0ubuntu2 on jammy:

  mdadm doesn't remove failed components from raid1 device and returns a
  0 exit code.  Using the actual device name instead of "failed" or
  "detached" doesn't make a difference.

  root at server:~# cat /proc/mdstat 
  Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
  md1 : active raid1 sdc2[2] sda2[3] sdb2[4](F)
        975581912 blocks super 1.2 [2/2] [UU]
        bitmap: 1/2 pages [4KB], 262144KB chunk

  md9 : active raid1 sdc1[2] sda1[0] sdb1[1](F)
        1046528 blocks super 1.2 [2/2] [UU]
   
  unused devices: <none>
  root at server:~# mdadm /dev/md9 -r detached 
  root at server:~# mdadm /dev/md1 -r detached 
  root at server:~# mdadm /dev/md9 -r failed
  root at server:~# mdadm /dev/md1 -r failed
  root at server:~# $?
  0: command not found
  root at server:~# cat /proc/mdstat 
  Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] 
  md1 : active raid1 sdc2[2] sda2[3] sdb2[4](F)
        975581912 blocks super 1.2 [2/2] [UU]
        bitmap: 1/2 pages [4KB], 262144KB chunk

  md9 : active raid1 sdc1[2] sda1[0] sdb1[1](F)
        1046528 blocks super 1.2 [2/2] [UU]
   
  unused devices: <none>
  root at server:~#

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