[CRIU] [PATCH 00/11] rework init child-reaper reparent handling for pidnses

[Pavel Tikhomirov]

That is not a CHILD_SUBREAPER case, only handles children
reparented to the init of pidns.

Redo re-reparenting of adopted branches from init 'back' to
their session leaders and helpers. Do it for each pidns.

First two patches are fixes, 3-6 adding helpers, 7 is main
thing and 8-10 adding different tests.

https://jira.sw.ru/browse/PSBM-62139

Pavel Tikhomirov (11):
  pstree: use RB_EMPTY_NODE to check that node is not linked
  restore: fix sys_wait4 error handling in case no child
  pstree/pid: add helper to get free pids in pidns and all it's
    ancestors
  pstree: add helper for_each_pssubtree_item to walk item's subtree
  pstree: add is_session_leader helper and use it where possible
  pstree: make equal_pid handle sid comparison between nested pidnses
  pstree: rework init reparent handling for pid namespaces
  pstree: enable sid handling back
  zdtm: add test for new init reparent handling
  zdtm: test for new init reparent handling with nested pidns
  zdtm: test for new init reparent handling with tricky setns

 criu/cr-restore.c               |  14 +-
 criu/include/pid.h              |  34 ++--
 criu/include/pstree.h           |   7 +-
 criu/namespaces.c               |  19 +-
 criu/pie/restorer.c             |   2 +-
 criu/pstree.c                   | 299 +++++++++++++++++++--------
 criu/tty.c                      |   4 +-
 test/zdtm/static/Makefile       |   1 +
 test/zdtm/static/session01.c    |  12 +-
 test/zdtm/static/session04.c    | 434 ++++++++++++++++++++++++++++++++++++++++
 test/zdtm/static/session04.desc |   1 +
 11 files changed, 702 insertions(+), 125 deletions(-)
 create mode 100644 test/zdtm/static/session04.c
 create mode 100644 test/zdtm/static/session04.desc

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2.9.3