# Buggy code
def _thread_multi_return(cls, minion_instance, opts, data):
    """
    This method should be used as a threading target, start the actual
    minion side execution.
    """
    # this seems awkward at first, but it's a workaround for Windows
    # multiprocessing communication.
    if not minion_instance:
        minion_instance = cls(opts)
    ret = {
        "return": {},
        "success": {},
    }
    for ind in range(0, len(data["fun"])):
        ret["success"][data["fun"][ind]] = False
        try:
            func = minion_instance.functions[data["fun"][ind]]
            args, kwargs = parse_args_and_kwargs(func, data["arg"][ind], data)
            ret["return"][data["fun"][ind]] = func(*args, **kwargs)
            ret["success"][data["fun"][ind]] = True
        except Exception as exc:
            trb = traceback.format_exc()
            log.warning("The minion function caused an exception: {0}".format(exc))
            ret["return"][data["fun"][ind]] = trb
        ret["jid"] = data["jid"]
    minion_instance._return_pub(ret)
    if data["ret"]:
        for returner in set(data["ret"].split(",")):
            ret["id"] = opts["id"]
            try:
                minion_instance.returners["{0}.returner".format(returner)](ret)
            except Exception as exc:
                log.error("The return failed for job {0} {1}".format(data["jid"], exc))


# Traceback (AttributeError)
[ERROR   ] Error in function _master_opts:
Traceback (most recent call last):
File "/usr/lib/pymodules/python2.7/salt/master.py", line 1444, in run_func
ret = getattr(self, func)(load)
File "/usr/lib/pymodules/python2.7/salt/master.py", line 891, in _master_opts
envs = self._file_envs()
File "/usr/lib/pymodules/python2.7/salt/fileserver/__init__.py", line 153, in envs
ret.update(self.servers[fstr]())
File "/usr/lib/pymodules/python2.7/salt/fileserver/hgfs.py", line 176, in envs
tags = repo.get_tags()
AttributeError: 'hgclient' object has no attribute 'get_tags'

# Fixed code
def _thread_multi_return(cls, minion_instance, opts, data):
    """
    This method should be used as a threading target, start the actual
    minion side execution.
    """
    # this seems awkward at first, but it's a workaround for Windows
    # multiprocessing communication.
    if not minion_instance:
        minion_instance = cls(opts)
    ret = {
        "return": {},
        "success": {},
    }
    for ind in range(0, len(data["fun"])):
        ret["success"][data["fun"][ind]] = False
        try:
            func = minion_instance.functions[data["fun"][ind]]
            args, kwargs = parse_args_and_kwargs(func, data["arg"][ind], data)
            ret["return"][data["fun"][ind]] = func(*args, **kwargs)
            ret["success"][data["fun"][ind]] = True
        except Exception as exc:
            trb = traceback.format_exc()
            log.warning("The minion function caused an exception: {0}".format(exc))
            ret["return"][data["fun"][ind]] = trb
        ret["jid"] = data["jid"]
        ret["fun"] = data["fun"]
        ret["fun_args"] = data["arg"]
    minion_instance._return_pub(ret)
    if data["ret"]:
        for returner in set(data["ret"].split(",")):
            ret["id"] = opts["id"]
            try:
                minion_instance.returners["{0}.returner".format(returner)](ret)
            except Exception as exc:
                log.error("The return failed for job {0} {1}".format(data["jid"], exc))