Issue #2540438 by znerol, timmillwood: Invalid format string when falling back to error_log in _drupal_log_error()

Issue #2528292 by Fabianx, dawehner: Decouple Error testing from relying on a cached on disk-container that is created by a different Kernel

Issue #2509898 by dawehner, znerol, larowlan, lauriii, Aki Tendo, Wim Leers: Additional uncaught exception thrown while handling exception after service changes