Kernel does not re-read new partition created on mdraid device and shows warning: Device or resource busy.

Issue

• The new partition is not getting re-read by partprobe or partx.

Number      Start       End         Size        File system Name    Flags
1           65536s      2097465343s 2097399808s             test1
2           2097479680s 4194887679s 2097408000s             test2
3           4194893824s 6292301823s 2097408000s             test3
4           6292307968s 8389715967s 2097408000s             test4
5           8389722112s 10487130111s 2097408000s            test5

• Getting warning while creating next [6th] partition.

(parted) mkpart test6 10487136256s  12584544255s
Warning: WARNING: the kernel failed to re-read the partition table on /dev/md0 (Device or resource busy).  As a result, it may not reflect all of your changes until after reboot.
(parted) print
Model: Unknown (unknown)
Disk /dev/md0: 25392250880s
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number      Start       End         Size        File system Name    Flags
1           65536s      2097465343s 2097399808s             test1
2           2097479680s 4194887679s 2097408000s             test2
3           4194893824s 6292301823s 2097408000s             test3
4           6292307968s 8389715967s 2097408000s             test4
5           8389722112s 10487130111s 2097408000s            test5
6           10487136256s 12584544255s 2097408000s           test6

(parted) quit
Information: You may need to update /etc/fstab.

• partx shows "Device or resource busy"

# partx -v -a /dev/md0
device-mapper: reload ioctl on md0p1 failed: Device or resource busy
create/reload failed on md0p1
device-mapper: reload ioctl on md0p2 failed: Device or resource busy
create/reload failed on md0p2
device-mapper: reload ioctl on md0p3 failed: Device or resource busy
create/reload failed on md0p3
device-mapper: reload ioctl on md0p4 failed: Device or resource busy
create/reload failed on md0p4
device-mapper: reload ioctl on md0p5 failed: Device or resource busy
create/reload failed on md0p5
device-mapper: reload ioctl on md0p6 failed: Device or resource busy
create/reload failed on md0p6

• fdisk shows "No such file or directory"

# fdisk /dev/md0p6
fdisk: cannot open /dev/md0p11: No such file or directory