about Uninterrumpible process killable

about Uninterrumpible process killable

I'm studying about process status and I've found that if I run a command
in D STATE and then I've tried to kill:
[root@mpinode02 Distros]# time find / -mmin +10 > /dev/null &
[1] 15592
[root@mpinode02 Distros]# ps -C find -ostat,comm,wchan
STAT COMMAND WCHAN
D find sleep_on_buffer
[root@mpinode02 Distros]# kill 15592
[root@mpinode02 Distros]# ps -C find -ostat,comm,wchan
STAT COMMAND WCHAN
D find sleep_on_buffer
[1]+ Terminado time find / -mmin +10 > /dev/null
So, as you can see process with D in the real world was killed. Please
could you explain me when a process is really uninterrumpible?
Thanks in advance!