# Logstash freezes post update to 6.2.4

**URL:** <https://discuss.elastic.co/t/logstash-freezes-post-update-to-6-2-4/128675>\
**Category:** Logstash\
**Created:** [April 19, 2018, 10:43am UTC](https://discuss.elastic.co/t/logstash-freezes-post-update-to-6-2-4/128675 "2018-04-19T10:43:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Dheeraj\_Gupta](https://avatars.discourse-cdn.com/v4/letter/d/49beb7/32.png) [@Dheeraj\_Gupta](https://discuss.elastic.co/u/Dheeraj_Gupta)\
**Post date:** [April 19, 2018, 10:43am UTC](https://discuss.elastic.co/t/logstash-freezes-post-update-to-6-2-4/128675/1 "2018-04-19T10:43:22Z")

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I am running three logstash instances which were on 6.2.3 version. Today I upgraded all of them to 6.2.4. The update process was smooth on 2 of the instances and no problem was noticed.

On the third instance, logstash was in a "locked" up state post update. The logstash logs had no other entry except `Pipeline started` and the process state itself was `S(Sleeping)`.Eventually the system load fell to 0. Then I looked at /var/log/messages which had the following error traceback (posted on pastebin as the traceback is too big)

[https://pastebin.com/Uns7PKZX](https://pastebin.com/Uns7PKZX)

This error was repeated a bunch of times. To recover, I had to empty the queue and restart logstash. After this the instance worked normally.

My pipeline has beats input plugin and elasticsearch and TCP output plugin.

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**Author:** ![PandKing](https://avatars.discourse-cdn.com/v4/letter/p/258eb7/32.png) [@PandKing](https://discuss.elastic.co/u/PandKing)\
**Post date:** [April 25, 2018, 1:28am UTC](https://discuss.elastic.co/t/logstash-freezes-post-update-to-6-2-4/128675/2 "2018-04-25T01:28:21Z")

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Same here.

> [@Logstash-6.2.4-1 persisted queue hung again](https://discuss.elastic.co/t/logstash-6-2-4-1-persisted-queue-hung-again/129374):
>
> Spent a couple hours looking through the forum. Lots of people talking about persisted queues not processing but have not seen any solutions to troubleshoot. This seems to be a single file that needs to be looked at 55940 How can I fix that file and process the rest ? [2018-04-24T17:34:03,691][DEBUG][org.logstash.ackedqueue.Queue] opening tail page: 55938, in: /opt/logstash/queue/main, with checkpoint: pageNum=55938, firstUnackedPageNum=0, firstUnackedSeqNum=1321359026, minSeqNum=1321359026, e…

All ugly after this.  
Apr 24 22:24:00 ent-mocsmlh04 systemd: Starting logstash...  
Apr 24 22:24:22 ent-mocsmlh04 logstash: Sending Logstash's logs to /var/log/logstash which is now configured via log4j2.properties  
Apr 24 22:25:22 ent-mocsmlh04 logstash: Exception in thread "Ruby-0-Thread-9@[main]\>worker0: /usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:385" org.logstash.ackedqueue.QueueRuntimeException: deserialize invocation error  
Apr 24 22:25:22 ent-mocsmlh04 logstash: at org.logstash.ackedqueue.Queue.deserialize(Queue.java:733)  
Apr 24 22:25:22 ent-mocsmlh04 logstash: at org.logstash.ackedqueue.Batch.deserializeElements(Batch.java:62)

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 23, 2018, 1:28am UTC](https://discuss.elastic.co/t/logstash-freezes-post-update-to-6-2-4/128675/3 "2018-05-23T01:28:30Z")

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