---

yaml
---
r: 25515
b: refs/heads/master
c: f5e9028
h: refs/heads/master
i:
  25513: 9af4b73
  25511: 75ce824
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 491d4bed8051c655c7664b85446e13901463eb63
+refs/heads/master: f5e902817fee1589badca1284f49eecc0ef0c200

trunk/fs/exec.c

@@ -678,6 +678,18 @@ static int de_thread(struct task_struct *tsk)
 		while (leader->exit_state != EXIT_ZOMBIE)
 			yield();
 
+		/*
+		 * The only record we have of the real-time age of a
+		 * process, regardless of execs it's done, is start_time.
+		 * All the past CPU time is accumulated in signal_struct
+		 * from sister threads now dead.  But in this non-leader
+		 * exec, nothing survives from the original leader thread,
+		 * whose birth marks the true age of this process now.
+		 * When we take on its identity by switching to its PID, we
+		 * also take its birthdate (always earlier than our own).
+		 */
+		current->start_time = leader->start_time;
+
 		spin_lock(&leader->proc_lock);
 		spin_lock(&current->proc_lock);
 		proc_dentry1 = proc_pid_unhash(current);