[PATCH]ptrace-wait_task_zombie-do-not-account-traced-sub-threads-fix

[Oleg Nesterov]

On 06/15, Roland McGrath wrote:
>
> ACK, but I think it warrants a comment explaining that task_detached() here
> always means "ptrace'd but not reparented".

Please see below. Not sure my comment is more clear...

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

--- PTRACE/kernel/exit.c~1_WAIT_REPARENTED_COMMENT	2009-06-18 20:39:07.000000000 +0200
+++ PTRACE/kernel/exit.c	2009-06-18 20:42:05.000000000 +0200
@@ -1188,7 +1188,10 @@ static int wait_task_zombie(struct wait_
 	}
 
 	traced = ptrace_reparented(p);
-
+	/*
+	 * It can be ptraced but not reparented, check
+	 * !task_detached() to filter out sub-threads.
+	 */
 	if (likely(!traced) && likely(!task_detached(p))) {
 		struct signal_struct *psig;
 		struct signal_struct *sig;

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