Comment known CFNetworkExecuteProxyAutoConfigurationURL leak.

resolver_mac.c

@@ -158,14 +158,21 @@ bool proxy_resolver_mac_get_proxies_for_url(void *ctx, const char *url) {
 
     CFStreamClientContext context = {0, proxy_resolver, NULL, NULL, NULL};
 
+    // There is a known issue mentioned in Chromium source, that the run loop instance 
+    // returned by CFNetworkExecuteProxyAutoConfigurationURL leaks.
+
+    // Additionally it is discussed on these forums:
+    //  http://www.openradar.appspot.com/20974299
+    //  https://forums.developer.apple.com/forums/thread/724883
+    //  https://stackoverflow.com/questions/53290871
+
     CFRunLoopSourceRef run_loop = CFNetworkExecuteProxyAutoConfigurationURL(
         url_ref, target_url_ref, proxy_resolver_mac_auto_config_result_callback, &context);
     if (!run_loop) {
         proxy_resolver->error = ELOOP;
         LOG_ERROR("Failed to execute pac url (%" PRId64 ")\n", proxy_resolver->error);
         goto mac_done;
     }
-
     CFRunLoopAddSource(CFRunLoopGetCurrent(), run_loop, PROXY_RESOLVER_RUN_LOOP);
     CFRunLoopRunInMode(PROXY_RESOLVER_RUN_LOOP, PROXY_RESOLVER_TIMEOUT_SEC, false);
     CFRunLoopRemoveSource(CFRunLoopGetCurrent(), run_loop, PROXY_RESOLVER_RUN_LOOP);