Hello, Frederic.
7e381b0eb1 ("cgroup: Drop task_lock(parent) on cgroup_fork()") removed
task_lock from cgroup_fork citing that current->cgroups can't change
due to threadgroup_change locking; however, threadgroup_change locking
is used only during CLONE_THREAD forking. If @current is forking a
new process, there's nothing preventing someone else to migrate the
parent while forking is in progress and delete the css_set it
currently is using. Am I confused somewhere?
Thanks.
--
tejun
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