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-rw-r--r--kernel/exit.c27
1 files changed, 26 insertions, 1 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index d9e8e5ee9d7f..567909fd6be4 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -879,7 +879,32 @@ static inline void exit_child_reaper(struct task_struct *tsk)
879 if (likely(tsk->group_leader != task_child_reaper(tsk))) 879 if (likely(tsk->group_leader != task_child_reaper(tsk)))
880 return; 880 return;
881 881
882 panic("Attempted to kill init!"); 882 if (tsk->nsproxy->pid_ns == &init_pid_ns)
883 panic("Attempted to kill init!");
884
885 /*
886 * @tsk is the last thread in the 'cgroup-init' and is exiting.
887 * Terminate all remaining processes in the namespace and reap them
888 * before exiting @tsk.
889 *
890 * Note that @tsk (last thread of cgroup-init) may not necessarily
891 * be the child-reaper (i.e main thread of cgroup-init) of the
892 * namespace i.e the child_reaper may have already exited.
893 *
894 * Even after a child_reaper exits, we let it inherit orphaned children,
895 * because, pid_ns->child_reaper remains valid as long as there is
896 * at least one living sub-thread in the cgroup init.
897
898 * This living sub-thread of the cgroup-init will be notified when
899 * a child inherited by the 'child-reaper' exits (do_notify_parent()
900 * uses __group_send_sig_info()). Further, when reaping child processes,
901 * do_wait() iterates over children of all living sub threads.
902
903 * i.e even though 'child_reaper' thread is listed as the parent of the
904 * orphaned children, any living sub-thread in the cgroup-init can
905 * perform the role of the child_reaper.
906 */
907 zap_pid_ns_processes(tsk->nsproxy->pid_ns);
883} 908}
884 909
885fastcall NORET_TYPE void do_exit(long code) 910fastcall NORET_TYPE void do_exit(long code)