also lock oldname when applied

Library/Homebrew/formula.rb

@@ -689,10 +689,15 @@ class Formula
   def lock
     @lock = FormulaLock.new(name)
     @lock.lock
+    if oldname && (oldname_rack = HOMEBREW_CELLAR/oldname).exist? && oldname_rack.resolved_path == rack
+      @oldname_lock = FormulaLock.new(oldname)
+      @oldname_lock.lock
+    end
   end
 
   def unlock
     @lock.unlock unless @lock.nil?
+    @oldname_lock.unlock unless @oldname_lock.nil?
   end
 
   def pinnable?

Library/Homebrew/keg.rb

@@ -216,7 +216,13 @@ class Keg
   end
 
   def lock
-    FormulaLock.new(name).with_lock { yield }
+    FormulaLock.new(name).with_lock do
+      if oldname_opt_record
+        FormulaLock.new(oldname_opt_record.basename.to_s).with_lock { yield }
+      else
+        yield
+      end
+    end
   end
 
   def completion_installed?(shell)