row0vers.c:

  Add forgotten mutex_enter()

innobase/row/row0vers.c

@@ -88,6 +88,7 @@ row_vers_impl_x_locked_off_kernel(
 		a rollback we always undo the modifications to secondary index
 		records before the clustered index record. */
 
+		mutex_enter(&kernel_mutex);
 		mtr_commit(&mtr);
 
 	        return(NULL);