system_u process does not have system_r

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I've mapped user 'de' to system_u --

semanage login -l

Login Name           SELinux User         MLS/MCS Range Service

__default__          unconfined_u         s0-s0:c0.c1023       *
de                   system_u             s0-s0:c0.c1023       *
root                 unconfined_u         s0-s0:c0.c1023       *
system_u             system_u             s0-s0:c0.c1023       *

However the processes do not have system_r role, as a result the type value of many context fail to set cause unconfined_r is not allowed to have that type.

ps auxZ | grep nano
system_u:unconfined_r:unconfined_t:s0 de 544 0.0 0.3 115024 1568 pts/1 S+ 22:11 0:00 nano system_u:unconfined_r:unconfined_t:s0 root 611 0.0 0.1 112632 888 pts/0 S+ 22:14 0:00 grep --color=auto nano

Actually unconfined_r role is not allowed for the user --

seinfo -uuser_u -x
   user_u
      default level: s0
      range: s0
      roles:
         object_r
         user_r
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