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Re: [sumo-user] Double Free or Corruption Error
Output file size shouldn't be a reason for crashing because the things that were written are no longer stored in memory.
Still, it would be a good idea to monitor the memory utilization of your computer to see if it hits the RAM boundary.

Another thing you could try is building the debug version of sumo, then starting sumo in the debugger and send me a stack trace. See https://sumo.dlr.de/wiki/TraCI/Interfacing_TraCI_from_Python#Debugging_a_TraCI_session_on_Linux

regards,
Jakob


Am Di., 19. März 2019 um 08:31 Uhr schrieb Toby Cannon <tobycannon50@xxxxxxxxx>:
Hi all,
I'm currently trying to run a big simulation with traci using a cropped version of the cologne scenario.
I'm outputting both the full output as well as the edge emissions data to XML files.

After around 4000 (roughly half way) timesteps I am getting the error:

double free or corruption (!prev)
Traceback (most recent call last):
  File "mainScript.py", line 108, in <module>
    main()
  File "mainScript.py", line 92, in main
    CHDurations, CHDistances = simulation("CH")
  File "mainScript.py", line 53, in simulation
    traci.simulationStep()
  File "/home/toby/sumo-1.1.0/tools/traci/__init__.py", line 127, in simulationStep
    responses = _connections[""].simulationStep(step)
  File "/home/toby/sumo-1.1.0/tools/traci/connection.py", line 323, in simulationStep
    result = self._sendExact()
  File "/home/toby/sumo-1.1.0/tools/traci/connection.py", line 99, in _sendExact
    raise FatalTraCIError("connection closed by SUMO")
traci.exceptions.FatalTraCIError: connection closed by SUMO

It's running on Ubuntu with 8GB memory.
The full output XML file is at 3.4GB when it crashed which I feel may be a cause.
Does anyone know what may be causing this error and how I can fix it?

Many thanks,
Toby


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