Fix: relayd: don't call lttng_ht_destroy in RCU read-side C.S.
[lttng-tools.git] / src / bin / lttng-relayd / session.c
index 14ae874ea782ef45624447659d988c1bd3a05258..2300e5f1adab5c6c2190af4829cb9c2767f3e2f3 100644 (file)
@@ -131,7 +131,14 @@ static void rcu_destroy_session(struct rcu_head *rcu_head)
        struct relay_session *session =
                        caa_container_of(rcu_head, struct relay_session,
                                rcu_node);
-
+       /*
+        * Since each trace has a reference on the session, it means
+        * that if we are at the point where we teardown the session, no
+        * trace belonging to that session exist at this point.
+        * Calling lttng_ht_destroy in call_rcu worker thread so we
+        * don't hold the RCU read-side lock while calling it.
+        */
+       lttng_ht_destroy(session->ctf_traces_ht);
        free(session);
 }
 
@@ -155,12 +162,6 @@ static void destroy_session(struct relay_session *session)
 
        ret = session_delete(session);
        assert(!ret);
-       /*
-        * Since each trace has a reference on the session, it means
-        * that if we are at the point where we teardown the session, no
-        * trace belonging to that session exist at this point.
-        */
-       lttng_ht_destroy(session->ctf_traces_ht);
        call_rcu(&session->rcu_node, rcu_destroy_session);
 }
 
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