From 26c9fb15e7df1ef1e2a6ed95c31ad4142f017bde Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@redhat.com>
Date: Sun, 30 Oct 2005 15:02:50 -0800
Subject: [PATCH] --- yaml --- r: 11857 b: refs/heads/master c:
 7f2a52555998c699a7e89f24636c909d6fc08a60 h: refs/heads/master i:   11855:
 77fd29217990b793a292c57323103eb0249dbc44 v: v3

---
 [refs]              | 2 +-
 trunk/kernel/exit.c | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 62c4a253217b..e44620dbce94 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 396dc44bcac58f464b7b23c345052e37881cccea
+refs/heads/master: 7f2a52555998c699a7e89f24636c909d6fc08a60
diff --git a/trunk/kernel/exit.c b/trunk/kernel/exit.c
index 6ef8f7356a74..2d39ccc367e6 100644
--- a/trunk/kernel/exit.c
+++ b/trunk/kernel/exit.c
@@ -1383,6 +1383,15 @@ static long do_wait(pid_t pid, int options, struct siginfo __user *infop,
 
 			switch (p->state) {
 			case TASK_TRACED:
+				/*
+				 * When we hit the race with PTRACE_ATTACH,
+				 * we will not report this child.  But the
+				 * race means it has not yet been moved to
+				 * our ptrace_children list, so we need to
+				 * set the flag here to avoid a spurious ECHILD
+				 * when the race happens with the only child.
+				 */
+				flag = 1;
 				if (!my_ptrace_child(p))
 					continue;
 				/*FALLTHROUGH*/