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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."

Unfortunately no. self.path_to_log points to each execution's own path. I can check the files and they are all empty

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

Thank you, I'm going to try this


Sincerely,

Marcelo d'Almeida


On Tue, Mar 2, 2021 at 6:30 AM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:
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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