1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/pid.h b/include/linux/pid.h
index b91f4732dc1b..f84d532b5d23 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -152,7 +152,13 @@ pid_t pid_vnr(struct pid *pid);
                         hlist_for_each_entry_rcu((task), pos___,        \
                                 &pid->tasks[type], pids[type].node) {
 
+                        /*
+                         * Both old and new leaders may be attached to
+                         * the same pid in the middle of de_thread().
+                         */
 #define while_each_pid_task(pid, type, task)                            \
+                                if (type == PIDTYPE_PID)                \
+                                        break;                          \
                         }                                               \
         } while (0)