# Buggy code
def _UpdateProcessingStatus(self, pid, process_status):
    """Updates the processing status.

    Args:
      pid (int): process identifier (PID) of the worker process.
      process_status (dict[str, object]): status values received from
          the worker process.

    Raises:
      KeyError: if the process is not registered with the engine.
    """
    self._RaiseIfNotRegistered(pid)

    if not process_status:
        return

    process = self._processes_per_pid[pid]

    processing_status = process_status.get("processing_status", None)

    self._RaiseIfNotMonitored(pid)

    display_name = process_status.get("display_name", "")
    number_of_consumed_errors = process_status.get("number_of_consumed_errors", None)
    number_of_produced_errors = process_status.get("number_of_produced_errors", None)
    number_of_consumed_events = process_status.get("number_of_consumed_events", None)
    number_of_produced_events = process_status.get("number_of_produced_events", None)
    number_of_consumed_reports = process_status.get("number_of_consumed_reports", None)
    number_of_produced_reports = process_status.get("number_of_produced_reports", None)
    number_of_consumed_sources = process_status.get("number_of_consumed_sources", None)
    number_of_produced_sources = process_status.get("number_of_produced_sources", None)

    if processing_status != definitions.PROCESSING_STATUS_IDLE:
        last_activity_timestamp = process_status.get("last_activity_timestamp", 0.0)

        if last_activity_timestamp:
            last_activity_timestamp += self._PROCESS_WORKER_TIMEOUT

            current_timestamp = time.time()
            if current_timestamp > last_activity_timestamp:
                logging.error(
                    (
                        "Process {0:s} (PID: {1:d}) has not reported activity within "
                        "the timeout period."
                    ).format(process.name, pid)
                )
                processing_status = definitions.PROCESSING_STATUS_NOT_RESPONDING

    self._processing_status.UpdateWorkerStatus(
        process.name,
        processing_status,
        pid,
        display_name,
        number_of_consumed_sources,
        number_of_produced_sources,
        number_of_consumed_events,
        number_of_produced_events,
        number_of_consumed_errors,
        number_of_produced_errors,
        number_of_consumed_reports,
        number_of_produced_reports,
    )


# Traceback (KeyError)
[ERROR] (nsrlsvr   ) PID:XXXXX <analysis_process> <dfvfs.path.os_path_spec.OSPathSpec object at 0xXXXXXXXXXXXX>
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/plaso/multi_processing/analysis_process.py", line 138, in _Main
self._analysis_mediator.ProduceAnalysisReport(self._analysis_plugin)
File "/usr/lib/python2.7/dist-packages/plaso/analysis/mediator.py", line 95, in ProduceAnalysisReport
analysis_report = plugin.CompileReport(self)
File "/usr/lib/python2.7/dist-packages/plaso/analysis/interface.py", line 280, in CompileReport
hash_analysis)
File "/usr/lib/python2.7/dist-packages/plaso/analysis/interface.py", line 187, in _HandleHashAnalysis
event_uuids = self._event_uuids_by_pathspec.pop(pathspec)
KeyError: <dfvfs.path.os_path_spec.OSPathSpec object at 0xXXXXXXXXXXXX>

# Fixed code
def _UpdateProcessingStatus(self, pid, process_status):
    """Updates the processing status.

    Args:
      pid (int): process identifier (PID) of the worker process.
      process_status (dict[str, object]): status values received from
          the worker process.

    Raises:
      KeyError: if the process is not registered with the engine.
    """
    self._RaiseIfNotRegistered(pid)

    if not process_status:
        return

    process = self._processes_per_pid[pid]

    processing_status = process_status.get("processing_status", None)

    self._RaiseIfNotMonitored(pid)

    display_name = process_status.get("display_name", "")
    number_of_consumed_errors = process_status.get("number_of_consumed_errors", None)
    number_of_produced_errors = process_status.get("number_of_produced_errors", None)

    number_of_consumed_event_tags = process_status.get(
        "number_of_consumed_event_tags", None
    )
    number_of_produced_event_tags = process_status.get(
        "number_of_produced_event_tags", None
    )

    number_of_consumed_events = process_status.get("number_of_consumed_events", None)
    number_of_produced_events = process_status.get("number_of_produced_events", None)

    number_of_consumed_reports = process_status.get("number_of_consumed_reports", None)
    number_of_produced_reports = process_status.get("number_of_produced_reports", None)

    number_of_consumed_sources = process_status.get("number_of_consumed_sources", None)
    number_of_produced_sources = process_status.get("number_of_produced_sources", None)

    if processing_status != definitions.PROCESSING_STATUS_IDLE:
        last_activity_timestamp = process_status.get("last_activity_timestamp", 0.0)

        if last_activity_timestamp:
            last_activity_timestamp += self._PROCESS_WORKER_TIMEOUT

            current_timestamp = time.time()
            if current_timestamp > last_activity_timestamp:
                logging.error(
                    (
                        "Process {0:s} (PID: {1:d}) has not reported activity within "
                        "the timeout period."
                    ).format(process.name, pid)
                )
                processing_status = definitions.PROCESSING_STATUS_NOT_RESPONDING

    self._processing_status.UpdateWorkerStatus(
        process.name,
        processing_status,
        pid,
        display_name,
        number_of_consumed_sources,
        number_of_produced_sources,
        number_of_consumed_events,
        number_of_produced_events,
        number_of_consumed_event_tags,
        number_of_produced_event_tags,
        number_of_consumed_errors,
        number_of_produced_errors,
        number_of_consumed_reports,
        number_of_produced_reports,
    )