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========= killed error solution ======== free -m mkdir -p /var/_swap_ cd /var/_swap_ #Here, 1M * 2000 ~= 2GB of swap memory dd if=/dev/zero of=swapfile bs=1M count=2000 mkswap swapfile swapon swapfile chmod 600 swapfile echo "/var/_swap_/swapfile none swap sw 0 0" >> /etc/fstab #cat /proc/meminfo free -m

There is also in Magento 2 a form key validator Magento \Framework\Data\Form\FormKey\Validator public function validate(\Magento\Framework\App\RequestInterface $request) { $formKey = $request->getParam('form_key', null); if (!$formKey || $formKey !== $this->_formKey->getFormKey()) { return false;//for solving please return true here } return true; }