srv0srv.c:

  srv_printf_innodb_monitor(): Removed extraneous rewind() call.
  The caller of this function calls rewind() if necessary.
  In this way, we avoid rewind()ing stderr in
  srv_lock_timeout_and_monitor_thread().

innobase/srv/srv0srv.c

@@ -1439,7 +1439,6 @@ srv_printf_innodb_monitor(
 
 	srv_last_monitor_time = time(NULL);
 
-	rewind(file);
 	fputs("\n=====================================\n", file);
 
 	ut_print_timestamp(file);