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12d87c3ba5
safe_process puts its children (mysqld, in this case) into a separate process group, to be able to kill it all at once. buildslave kills mtr's process group when it loses connection to the master. result? buildslave kills mtr and safe_process, but leaves stale mysqld processes in their own process groups. fix: put safe_process itself into a separate process group, then buildslave won't kill it and safe_process will kill mysqld'd and itself when it will notice that the parent mtr no longer exists.