Logstash 6.1 Fatal error crashing background running logstash when stdout output plugin is used

Elastic Stack Logstash
1

Hi Team,

I'm getting this error while receiving data via the input plugin if stdout output plugin is used when logstash instance has been put to run in the background.

It is not a problem per se as I do not intend to use the stdout plugin when logstash is intended to be run in the background. However I do not recall this happening before so was wondering if this is a "new" thing.

[2018-01-08T12:22:44,915][FATAL][logstash.runner ] An unexpected error occurred! {:error=>#<SystemCallError: Unknown error (SystemCallError) - <STDOUT>>, :backtrace=>["org/jruby/RubyIO.java:1457:inwrite'", "org/jruby/RubyIO.java:1428:in write'", "/my/location/logstash/6.1.0/vendor/bundle/jruby/2.3.0/gems/logstash-output-stdout-3.1.3/lib/logstash/outputs/stdout.rb:44:inblock in multi_receive_encoded'", "org/jruby/RubyArray.java:1734:in each'", "/my/location/logstash/6.1.0/vendor/bundle/jruby/2.3.0/gems/logstash-output-stdout-3.1.3/lib/logstash/outputs/stdout.rb:43:inmulti_receive_encoded'", "/my/location/logstash/6.1.0/logstash-core/lib/logstash/outputs/base.rb:90:in multi_receive'", "/my/location/logstash/6.1.0/logstash-core/lib/logstash/output_delegator_strategies/single.rb:15:inblock in multi_receive'", "org/jruby/ext/thread/Mutex.java:148:in synchronize'", "/my/location/logstash/6.1.0/logstash-core/lib/logstash/output_delegator_strategies/single.rb:14:inmulti_receive'", "/my/location/logstash/6.1.0/logstash-core/lib/logstash/output_delegator.rb:50:in multi_receive'", "/my/location/logstash/6.1.0/logstash-core/lib/logstash/pipeline.rb:487:inblock in output_batch'", "org/jruby/RubyHash.java:1343:in each'", "/my/location/logstash/6.1.0/logstash-core/lib/logstash/pipeline.rb:486:inoutput_batch'", "/my/location/logstash/6.1.0/logstash-core/lib/logstash/pipeline.rb:438:in worker_loop'", "/my/location/logstash/6.1.0/logstash-core/lib/logstash/pipeline.rb:393:inblock in start_workers'"]}`

This is my config:

input {
    tcp {
        type  => "my_type"
        port  => 10013
        codec => json
    }
}

filter { }

output {
    elasticsearch {
        ...
    }

    stdout { codec => rubydebug }   # if I remove this then the error does not happen
}

Thanks for your help,

2

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