1 files changed, 8 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/vendor/mysql.rb b/activerecord/lib/active_record/vendor/mysql.rb
index 0d8cc2efd8..58ebed7d4f 100644
--- a/activerecord/lib/active_record/vendor/mysql.rb
+++ b/activerecord/lib/active_record/vendor/mysql.rb
@@ -1173,8 +1173,14 @@ class << Mysql
 
   def finalizer(net)
     proc {
-      net.clear
-      net.write Mysql::COM_QUIT.chr
+      begin
+        net.clear
+        net.write Mysql::COM_QUIT.chr
+        net.close
+      rescue Error => error
+        # Swallow lost connection errors if connection is already closed.
+        raise unless error.errno == Error::CR_SERVER_LOST
+      end
     }
   end