Logstash becomes unresponsive

I am using logstash version 6.1.1. I am currently using it to read multiple files using file input plugin and also runnning scripts though exec plugin and sending the events to elasticsearch. After I start logstash, it works fine but after some time, it may be hours or a couple of days, logstash becomes unresponsive. The process is still running, No error logs, No blocked threads, just it stops sending any events to elasticsearch. I researched a bit and found that the scripts it was running are all in DEFUNCT state. Could you help me out in debugging the issue?

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