mdadm: Cannot get exclusive access to /dev/md127

[Rich Emberson <emberson.rich@xxxxxxxxx>]

I've got a two disk raid and I want to it and convert the
disks to some non-raid usage. The raid was never used and has no data.
Also, the raid disks are encrypted along with the rest of the disk
in the machine.

When I try to stop raid I get the following:

# mdadm --stop /dev/md127
mdadm: Cannot get exclusive access to /dev/md127:Perhaps a running process, mounted filesystem or active volume group?

Googling about this there are a number of folks hitting this problem
over a number of fedora releases. Sadly, I could not find any fix.
For some the solution (nuclear solutions) was to use a different linux
distro or reinstall. I've got a lot of data on other disks on this system and
really don't want to use a nuclear solution.


Background information:

$ uname -a
Linux medusa 3.17.7-200.fc20.x86_64 #1 SMP Wed Dec 17 03:35:33 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

MDADM
# mdadm --misc --detail  /dev/md127
        Version : 1.2
  Creation Time : Fri Apr 25 17:19:52 2014
     Raid Level : raid1
     Array Size : 3906885632 (3725.90 GiB 4000.65 GB)
  Used Dev Size : 3906885632 (3725.90 GiB 4000.65 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Sun Feb  1 09:37:32 2015
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : localhost.localdomain:raid1
           UUID : be78cb55:f26bbf2b:7ad9b344:a2427875
         Events : 8527

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       49        1      active sync   /dev/sdd1

MDADM.CONF
# cat /etc/mdadm.conf
# mdadm.conf written out by anaconda
MAILADDR root
AUTO +imsm +1.x -all
ARRAY /dev/md/raid1 level=raid1 num-devices=2 UUID=be78cb55:f26bbf2b:7ad9b344:a2427875

LSOF
# lsof | grep md127
md127_rai  1044           root  cwd       DIR              253,1      4096          2 /
md127_rai  1044           root  rtd       DIR              253,1      4096          2 /
md127_rai  1044           root  txt   unknown                                         /proc/1044/exe
udisksd    2120           root   13r      REG               0,15      4096      30332 /sys/devices/virtual/block/md127/md/sync_action
udisksd    2120           root   14r      REG               0,15      4096      30345 /sys/devices/virtual/block/md127/md/degraded
gmain      2120  2121     root   13r      REG               0,15      4096      30332 /sys/devices/virtual/block/md127/md/sync_action
gmain      2120  2121     root   14r      REG               0,15      4096      30345 /sys/devices/virtual/block/md127/md/degraded
gdbus      2120  2123     root   13r      REG               0,15      4096      30332 /sys/devices/virtual/block/md127/md/sync_action
gdbus      2120  2123     root   14r      REG               0,15      4096      30345 /sys/devices/virtual/block/md127/md/degraded
probing-t  2120  2124     root   13r      REG               0,15      4096      30332 /sys/devices/virtual/block/md127/md/sync_action
probing-t  2120  2124     root   14r      REG               0,15      4096      30345 /sys/devices/virtual/block/md127/md/degraded
cleanup    2120  2125     root   13r      REG               0,15      4096      30332 /sys/devices/virtual/block/md127/md/sync_action
cleanup    2120  2125     root   14r      REG               0,15      4096      30345 /sys/devices/virtual/block/md127/md/degraded

FSTAB ENTRY
/dev/mapper/luks-ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 /raid1                  ext4    defaults,x-systemd.device-timeout=0 1 2

BY-UUID
# ls -l /dev/disk/by-uuid/ | grep md127
lrwxrwxrwx. 1 root root 11 Jan 10 19:32 ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 -> ../../md127

Thanks
Richard

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