ubuntu_ltp_controllers memcg_subgroup_charge / memcg_max_usage_in_bytes / memcg_usage_in_bytes starts failing with LTP20220527 (Invalid argument)

[Po-Hsu Lin]

Please note this issue is only limited to nodes in our bare-metal pool, as I am currently testing this branch there.

With LTP test suite updated to 20220527 (https://github.com/linux-test-project/ltp/tree/20220527), these 3 tests:

  * memcg_subgroup_charge
  * memcg_max_usage_in_bytes
  * memcg_usage_in_bytes

starts failing on Ubuntu Bionic / Focal with identical error message:

  memcg_max_usage_in_bytes_test 1 TINFO: Warming up pid: 21434
  memcg_process: mmap(anonymous) failed: Invalid argument
  /opt/ltp/testcases/bin/memcg_max_usage_in_bytes_test.sh: 234: kill: No such process

  memcg_max_usage_in_bytes_test 1 TFAIL: Process 21434 exited with 1 after warm up

Bisect shows commit 0402163 is the cause, revert that change can make this green again.

Issue reported upstream, you will find the complete test log there: https://github.com/linux-test-project/ltp/issues/947

[Po-Hsu Lin (cypressyew)]

On PowerPC systems with Ubuntu Bionic there will be 2 more failures:
  * memcg_failcnt
  * memcg_stat_rss

[Po-Hsu Lin (cypressyew)]

This issue has been fixed with commit bda92ad659 "memcg/functional: Fix usage of PAGESIZE from memcg_lib.sh" in LTP upstream.

We will include this in the next LTP update.

[Po-Hsu Lin (cypressyew)]

LTP update pushed to our fork.