ubuntu_ltp_controllers:cpuset_load_balance: "get latest cpu failed" on spitfire

On spitfire(amd64) for xenial:linux-hwe(4.15.0-163.171~16.04.1) on sru-20211108 the last test (25) shows a lot of repeated occurrences of the same messages:

  ...
  cpuset_load_balance 25 TINFO: cpuset_cpu_hog: get latest cpu failed.
  cpuset_load_balance 25 TINFO: : Invalid argument
  cpuset_load_balance 25 TINFO: cpuset_cpu_hog: get latest cpu failed.
  cpuset_load_balance 25 TINFO: : Invalid argument
  cpuset_load_balance 25 TINFO: cpuset_cpu_hog: get latest cpu failed.
  cpuset_load_balance 25 TINFO: : Invalid argument
  cpuset_load_balance 25 TFAIL: load balance test failed.
  INFO: ltp-pan reported some tests FAIL
  LTP Version: 20210927
  INFO: Test end time: Fri Nov 12 16:02:41 UTC 2021
16:02:42 INFO | END ERROR ubuntu_ltp_controllers.cpuset_load_balance ubuntu_ltp_controllers.cpuset_load_balance timestamp=1636732962 localtime=Nov 12 16:02:42

Right now, spitfire is showing deploy failures and also failures to do setups and is busy. I suspect this is some special condition which the test-case does not expect.