Add suppressed exceptions to stack.

core/src/main/java/ch/cyberduck/core/KeychainLoginService.java

@@ -196,12 +196,7 @@ public class KeychainLoginService implements LoginService {
             }
             catch(LoginCanceledException c) {
                 // Canceled by user
-                try {
-                    c.initCause(e);
-                }
-                catch(IllegalArgumentException | IllegalStateException r) {
-                    log.warn("Ignore error {} initializing failure {} with cause {}", r, e, c);
-                }
+                c.addSuppressed(e);
                 throw c;
             }
             log.debug("Reset credentials for {}", bookmark);

core/src/main/java/ch/cyberduck/core/worker/MountWorker.java

@@ -86,7 +86,13 @@ public class MountWorker extends Worker<Path> {
             // Retrieve directory listing of working directory
             final ListWorker worker = new ListWorker(cache, home, listener);
             listener.message(worker.getActivity());
-            cache.put(home, worker.run(session));
+            try {
+                cache.put(home, worker.run(session));
+            }
+            catch(BackgroundException f) {
+                f.addSuppressed(e);
+                throw f;
+            }
             return home;
         }
     }