diff options
| author | Michal Koutný <mkoutny@suse.com> | 2020-01-24 12:40:15 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2020-02-12 17:02:53 -0500 |
| commit | 9c974c77246460fa6a92c18554c3311c8c83c160 (patch) | |
| tree | b18bb13e7ddc8ed4522b6bc095ad279ba341ebb1 /drivers/idle | |
| parent | 2d4ecb030dcc90fb725ecbfc82ce5d6c37906e0e (diff) | |
cgroup: Iterate tasks that did not finish do_exit()
PF_EXITING is set earlier than actual removal from css_set when a task
is exitting. This can confuse cgroup.procs readers who see no PF_EXITING
tasks, however, rmdir is checking against css_set membership so it can
transitionally fail with EBUSY.
Fix this by listing tasks that weren't unlinked from css_set active
lists.
It may happen that other users of the task iterator (without
CSS_TASK_ITER_PROCS) spot a PF_EXITING task before cgroup_exit(). This
is equal to the state before commit c03cd7738a83 ("cgroup: Include dying
leaders with live threads in PROCS iterations") but it may be reviewed
later.
Reported-by: Suren Baghdasaryan <surenb@google.com>
Fixes: c03cd7738a83 ("cgroup: Include dying leaders with live threads in PROCS iterations")
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/idle')
0 files changed, 0 insertions, 0 deletions