cpuset_hierarchy from controller in LTP failed on Eoan

Issue found on P9 node "baltar".
this is a new issue after bug 1836188 was fixed locally.

03:58:29 DEBUG| [stdout] startup='Thu Feb 6 03:47:05 2020'
03:58:29 DEBUG| [stdout] cpuset_hierarchy 1 TINFO: father cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 1 TINFO: child cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 1 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 3 TINFO: father cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 3 TINFO: child cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 3 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 5 TINFO: father cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 5 TINFO: child cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 5 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 7 TINFO: father cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 7 TINFO: child cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 7 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 9 TINFO: father cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 9 TINFO: child cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 9 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 11 TINFO: father cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 11 TINFO: child cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 11 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 13 TINFO: father cpuset.cpus 0-1
03:58:29 DEBUG| [stdout] cpuset_hierarchy 13 TINFO: child cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 13 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 15 TINFO: father cpuset.cpus 0-1
03:58:29 DEBUG| [stdout] cpuset_hierarchy 15 TINFO: child cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 15 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 17 TINFO: father cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 17 TINFO: child cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 17 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 19 TINFO: father cpuset.cpus 0-155
03:58:29 DEBUG| [stdout] cpuset_hierarchy 19 TINFO: child cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 19 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 21 TINFO: father cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 21 TINFO: child cpuset.cpus
03:58:29 DEBUG| [stdout] cpuset_hierarchy 21 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 23 TINFO: father cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 23 TINFO: child cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 23 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 25 TINFO: father cpuset.cpus 0-155
03:58:29 DEBUG| [stdout] cpuset_hierarchy 25 TINFO: child cpuset.cpus 1
03:58:29 DEBUG| [stdout] cpuset_hierarchy 25 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 27 TINFO: father cpuset.cpus 0-155
03:58:29 DEBUG| [stdout] cpuset_hierarchy 27 TINFO: child cpuset.cpus 0-1
03:58:29 DEBUG| [stdout] cpuset_hierarchy 27 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 29 TINFO: father cpuset.cpus 0-1
03:58:29 DEBUG| [stdout] cpuset_hierarchy 29 TINFO: child cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 29 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 31 TINFO: father cpuset.cpus 0-1
03:58:29 DEBUG| [stdout] cpuset_hierarchy 31 TINFO: child cpuset.cpus 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 31 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 33 TINFO: father cpuset.mems
03:58:29 DEBUG| [stdout] cpuset_hierarchy 33 TINFO: child cpuset.mems
03:58:29 DEBUG| [stdout] cpuset_hierarchy 33 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 35 TINFO: father cpuset.mems
03:58:29 DEBUG| [stdout] cpuset_hierarchy 35 TINFO: child cpuset.mems
03:58:29 DEBUG| [stdout] cpuset_hierarchy 35 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 37 TINFO: father cpuset.mems 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 37 TINFO: child cpuset.mems
03:58:29 DEBUG| [stdout] cpuset_hierarchy 37 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 39 TINFO: father cpuset.mems 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 39 TINFO: child cpuset.mems 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 39 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 41 TINFO: father cpuset.mems 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 41 TINFO: child cpuset.mems
03:58:29 DEBUG| [stdout] cpuset_hierarchy 41 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] cpuset_hierarchy 43 TINFO: father cpuset.mems 0
03:58:29 DEBUG| [stdout] cpuset_hierarchy 43 TINFO: child cpuset.mems
03:58:29 DEBUG| [stdout] cpuset_hierarchy 43 TPASS: Hierarchy test succeeded.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 319: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 45 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 331: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 47 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 343: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 49 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 356: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 51 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 369: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 53 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 382: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 55 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 395: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 57 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 408: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 59 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 421: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 61 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] /opt/ltp/testcases/bin/cpuset_hierarchy_test.sh: 434: echo: echo: I/O error
03:58:29 DEBUG| [stdout] cpuset_hierarchy 63 TFAIL: Break the hierarchy limit.
03:58:29 DEBUG| [stdout] tag=cpuset_hierarchy stime=1580960825 dur=1 exit=exited stat=1 core=no cu=49 cs=49