magento2: Unable to send the cookie. Size of 'mage-messages' is 13831 bytes in reports

Preconditions

1. Magento CE 2.0.11

Steps to reproduce

1. Login as customer
2. Change email to an existing one of another customer
3. Submit form

Expected result

1. Should show an error message like ‘Email already in use’

Actual result

1. On production server: 503 error

Unable to send the cookie. Size of ‘mage-messages’ is 13831 bytes.

This limit is set in Magento\Framework\Stdlib\Cookie\PhpCookieManager::MAX_COOKIE_SIZE 2. On developer mode: just page reload and no error message displayed for customer.

This error is caused by returned stack trace that is too large for the cookie limit (4096 bytes) in Magento\Customer\Controller\Account\EditPost::execute()

       try {
                $this->customerRepository->save($customerCandidateDataObject);
            } catch (AuthenticationException $e) {
                $this->messageManager->addError($e->getMessage());
            } catch (InputException $e) {
                $this->messageManager->addException($e, __('Invalid input'));
            } catch (\Exception $e) {
                $message = __('We can\'t save the customer.')
                    . $e->getMessage()
                    . '<pre>' . $e->getTraceAsString() . '</pre>';
                $this->messageManager->addException($e, $message);
            }