Add a monkey pach of https://github.com/carrierwaveuploader/carrierwave/pull/2314

config/initializers/carrierwave_monkey_patch.rb

+# This is a monkey patch until https://github.com/carrierwaveuploader/carrierwave/pull/2314 has been merged
+# This fixes a problem https://gitlab.com/gitlab-org/gitlab-ce/issues/46182 that carrierwave loads large files into memory
+# and triggers sidekiq shutdown by hitting RSS limit.
+module CarrierWave
+  module Storage
+    class Fog < Abstract
+      class File
+        def read
+          file_body = file.body
+
+          return if file_body.nil?
+          return file_body unless file_body.is_a?(::File)
+
+          begin
+            file_body = ::File.open(file_body.path) if file_body.closed? # Reopen if it's closed
+            file_body.read
+          ensure
+            file_body.close
+          end
+        end
+
+        def store(new_file)
+          if new_file.is_a?(self.class)
+            new_file.copy_to(path)
+          else
+            fog_file = new_file.to_file
+            @content_type ||= new_file.content_type
+            @file = directory.files.create({
+              :body         => fog_file ? fog_file : new_file.read,
+              :content_type => @content_type,
+              :key          => path,
+              :public       => @uploader.fog_public
+            }.merge(@uploader.fog_attributes))
+            fog_file.close if fog_file && !fog_file.closed?
+          end
+          true
+        end
+      end
+    end
+  end
+end