mdadm times out when stopping disks, while the system is booting. No raid degradation.

Issue

• mdadm attempts to stop a disk and times out, while the system is being booted.

• The following is seen in /var/log/messages:

  Jan 01 00:00:00 localhost systemd: Timed out stoppping /dev/md1.
  Jan 01 00:00:00 localhost systemd: Timed out stoppping /sys/devices/virtual/block/md1.
  Jan 01 00:00:00 localhost systemd: Timed out stoppping /dev/md/var.
  Jan 01 00:00:00 localhost systemd: Timed out stoppping /dev/disk/by-uuid/00000000-0000-0000-0000-000000000000
  Jan 01 00:00:00 localhost systemd: Timed out stoppping /dev/disk/by-id/md-uuid-00000000-0000-0000-0000-000000000000
  Jan 01 00:00:00 localhost systemd: Timed out stoppping /dev/disk/by-id/md-name-localhost:var.
  

• mdadm raid does not get degraded.