Merge branch '2.3' into 2.4

system-test/backend_auth_fail.cpp

@@ -0,0 +1,42 @@
+/**
+ * @backend_auth_fail.cpp Repeatedly connect to maxscale while the backends reject all connections
+ *
+ * MaxScale should not crash
+ */
+
+#include <maxtest/testconnections.hh>
+
+int main(int argc, char** argv)
+{
+    MYSQL* mysql[1000];
+    TestConnections* Test = new TestConnections(argc, argv);
+
+    Test->repl->execute_query_all_nodes((char*) "set global max_connections = 10;");
+
+    for (int x = 0; x < 3; x++)
+    {
+        Test->tprintf("Creating 100 connections...\n");
+        for (int i = 0; i < 100; i++)
+        {
+            Test->set_timeout(30);
+            mysql[i] = Test->maxscales->open_readconn_master_connection(0);
+            execute_query_silent(mysql[i], "select 1");
+        }
+        Test->stop_timeout();
+
+        for (int i = 0; i < 100; i++)
+        {
+            Test->set_timeout(30);
+            mysql_close(mysql[i]);
+        }
+    }
+
+    // Wait for the connections to clean up
+    Test->stop_timeout();
+    sleep(2 * Test->repl->N);
+
+    Test->check_maxscale_alive(0);
+    int rval = Test->global_result;
+    delete Test;
+    return rval;
+}