# Logstash resarting with error

**URL:** <https://discuss.elastic.co/t/logstash-resarting-with-error/278666>\
**Category:** Logstash\
**Created:** [July 14, 2021, 1:17pm UTC](https://discuss.elastic.co/t/logstash-resarting-with-error/278666 "2021-07-14T13:17:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rojin](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rojin/32/97697_2.png) [@rojin](https://discuss.elastic.co/u/rojin)\
**Post date:** [July 14, 2021, 1:17pm UTC](https://discuss.elastic.co/t/logstash-resarting-with-error/278666/1 "2021-07-14T13:17:12Z")

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Hey, I have 3 logstash instances running but each gets restarted after a while with this error:

```auto
[2021-07-14T14:35:23,972][FATAL][logstash.runner] An unexpected error occurred! {:error=>java.lang.IllegalStateException: java.util.ConcurrentModificationException, :backtrace=>["org.logstash.execution.WorkerLoop.run(org/logstash/execution/WorkerLoop.java:85)", "jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)", "jdk.internal.reflect.NativeMethodAccessorImpl.invoke(jdk/internal/reflect/NativeMethodAccessorImpl.java:62)", "jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(jdk/internal/reflect/DelegatingMethodAccessorImpl.java:43)", "java.lang.reflect.Method.invoke(java/lang/reflect/Method.java:566)", "org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(org/jruby/javasupport/JavaMethod.java:440)", "org.jruby.javasupport.JavaMethod.invokeDirect(org/jruby/javasupport/JavaMethod.java:304)", "usr.share.logstash.logstash_minus_core.lib.logstash.java_pipeline.start_workers(/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:243)", "org.jruby.RubyProc.call(org/jruby/RubyProc.java:295)", "org.jruby.RubyProc.call(org/jruby/RubyProc.java:274)", "org.jruby.RubyProc.call(org/jruby/RubyProc.java:270)", "java.lang.Thread.run(java/lang/Thread.java:834)"]}

```

I have checked pipelines and logstash configurations as well. Can someone help me with this? Thanks in advance!

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 11, 2021, 1:18pm UTC](https://discuss.elastic.co/t/logstash-resarting-with-error/278666/2 "2021-08-11T13:18:05Z")

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