Hi,
I was looking into the issue and came up with an alternative solution that
changes task iteration to be consistent with cgroup_is_populated() check and
moving the responsibility to check PF_EXITING on the consumers of iterator API.

I haven't check your approach thoroughly, however, it appears to me it
complicates (already non-trivial) cgroup destruction path. I ran your selftest
on the iterators approach and it proved working.

Michal Koutný (2):
  cgroup: Unify css_set task lists
  cgroup: Iterate tasks that did not finish do_exit()

Suren Baghdasaryan (1):
  kselftest/cgroup: add cgroup destruction test

 include/linux/cgroup-defs.h                |  15 ++-
 include/linux/cgroup.h                     |   4 +-
 kernel/cgroup/cgroup.c                     |  86 ++++++++--------
 kernel/cgroup/debug.c                      |  16 ++-
 tools/testing/selftests/cgroup/test_core.c | 113 +++++++++++++++++++++
 5 files changed, 176 insertions(+), 58 deletions(-)

-- 
2.24.1


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