From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 18 Apr 2014 16:01:04 +0000 (-0400)
Subject: Fix: rcu_barrier(): uninitialized futex field
X-Git-Tag: v0.8.5~7
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=4fdcbc21f1039e67a80ed504d31383115e5f8052;p=userspace-rcu.git

Fix: rcu_barrier(): uninitialized futex field

This uninitialized futex field can lead to rcu_barrier() hang. This
issue has been found with Valgrind.

Fixes #787

Reported-by: Keir Fraser <keir@cohodata.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu-call-rcu-impl.h b/urcu-call-rcu-impl.h
index c2e175b..f0751f5 100644
--- a/urcu-call-rcu-impl.h
+++ b/urcu-call-rcu-impl.h
@@ -814,6 +814,7 @@ void rcu_barrier(void)
 		count++;
 
 	completion.barrier_count = count;
+	completion.futex = 0;
 
 	cds_list_for_each_entry(crdp, &call_rcu_data_list, list) {
 		struct call_rcu_completion_work *work;