From: David Goulet <dgoulet@efficios.com>
Date: Tue, 14 Feb 2012 20:35:31 +0000 (-0500)
Subject: Fix missing session locks
X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=commitdiff_plain;h=4ee14516054068e38d7dc5dbeaccd39151ca2d06

Fix missing session locks

When an application registers, an update is triggered to create pending
events of the global event registry. This process MUST held the session
lock and the session list locks since it's iterating over all sessions.

Signed-off-by: David Goulet <dgoulet@efficios.com>
---

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 8e794bdf4..6c4b8ec5c 100644
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -769,12 +769,18 @@ static void update_ust_app(int app_sock)
 {
 	struct ltt_session *sess, *stmp;
 
+	session_lock_list();
+
 	/* For all tracing session(s) */
 	cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
+		session_lock(sess);
 		if (sess->ust_session) {
 			ust_app_global_update(sess->ust_session, app_sock);
 		}
+		session_unlock(sess);
 	}
+
+	session_unlock_list();
 }
 
 /*