    private void safelyDeactivate(ManagedContext context, HttpServletRequest request) {
        try {
            context.deactivate();
        } catch(Exception e) {
            ServletLogger.LOG.unableToDeactivateContext(context, request);
            ServletLogger.LOG.catchingDebug(e);
        }
    }
The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.