From 266b7a021f7dcc4d4531961a47f4ef74c3c4ab6b Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 3 Jul 2013 15:08:35 -0700
Subject: [PATCH] fs/exec.c:de_thread: mt-exec should update ->real_start_time

924b42d5 ("Use boot based time for process start time and boot time in
/proc") updated copy_process/do_task_stat but forgot about de_thread().
This breaks "ps axOT" if a sub-thread execs.

Note: I think that task->start_time should die.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: John Stultz <johnstul@us.ibm.com>
Cc: Tomas Janousek <tjanouse@redhat.com>
Cc: Tomas Smetana <tsmetana@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/exec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/exec.c b/fs/exec.c
index 396aec2dae90..9c73def87642 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -932,6 +932,7 @@ static int de_thread(struct task_struct *tsk)
 		 * also take its birthdate (always earlier than our own).
 		 */
 		tsk->start_time = leader->start_time;
+		tsk->real_start_time = leader->real_start_time;
 
 		BUG_ON(!same_thread_group(leader, tsk));
 		BUG_ON(has_group_leader_pid(tsk));
-- 
2.11.0