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Re: [sumo-user] Unspecified Fatal Error and blank trace logging outputs
Could it be that multiple processes are writing to the same traceFile?
I recommend investigation on this front because reproducing the crash in isolation will probably be necessary to fix it.

Am Mo., 1. März 2021 um 22:53 Uhr schrieb Harald Schaefer <fechsaer@xxxxxxxxx>:

Hi Marcelo,

what you can try is to enable core dumps in your shell

    ulimit -c unlimited

Then run your test series.

The corefile might be very large, depending on your scenario size.

At the end you should have a file named core in your current working directory.

You can examine this file by

    gdb <path to sumo-bin> core

and type e.g. bt

The stacktrace might help the developers of SUMO

Greetings, Harald

Am 01.03.21 um 17:22 schrieb Marcelo Andrade Rodrigues D Almeida:
Hi everyone

I running traffic light control experiments in the Bologna (joined) scenario and from time to time I encounter an unspecified Fatal error. (shown below)

I'm trying to debug it, but:
- Logging the commands generate blank outputs (even with traceGetters enabled)

        trace_file_path = ROOT_DIR + '/' + self.path_to_log + '/' + 'trace_file_log.txt'
        traci.start(sumo_cmd_str, label=self.execution_name, traceFile=trace_file_path, traceGetters=True)


A trivial trace (logging) example works fine though

- Debugging the traci sessions is not viable since I cannot tell when the error is going to occur (I have to run the scenario 1600 times total per experiment)



I also updated the sumo to the latest nightly build but no success.

Is there anything I can try? I'm out of options here

Thank you in advance


Sincerely,

Marcelo d'Almeida


Error:
Process Process-1:22:
Traceback (most recent call last):
  File "/usr/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrap
    self.run()
  File "/usr/lib/python3.6/multiprocessing/process.py", line 93, in run
    self._target(*self._args, **self._kwargs)
  File "traffic-light-optimization/algorithm/frap_pub/pipeline.py", line 104, in generator_wrapper
    generator.generate()
  File "traffic-light-optimization/algorithm/frap_pub/generator.py", line 121, in generate
    next_state, reward, done, steps_iterated, next_action = self.env.step(action_list)
  File "traffic-light-optimization/algorithm/frap_pub/sumo_env.py", line 514, in step
    self._inner_step(action)
  File "traffic-light-optimization/algorithm/frap_pub/sumo_env.py", line 559, in _inner_step
    traci_connection.simulationStep()
  File "sumo-git/tools/traci/connection.py", line 302, in simulationStep
    result = self._sendCmd(tc.CMD_SIMSTEP, None, None, "D", step)
  File "sumo-git/tools/traci/connection.py", line 180, in _sendCmd
    return self._sendExact()
  File "sumo-git/tools/traci/connection.py", line 90, in _sendExact
    raise FatalTraCIError("connection closed by SUMO")
traci.exceptions.FatalTraCIError: connection closed by SUMO

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