# Cannot start docker image (elasticsearch 6.8

**URL:** <https://discuss.elastic.co/t/cannot-start-docker-image-elasticsearch-6-8/287161>\
**Category:** Elasticsearch\
**Tags:** docker\
**Created:** [October 20, 2021, 7:53am UTC](https://discuss.elastic.co/t/cannot-start-docker-image-elasticsearch-6-8/287161 "2021-10-20T07:53:05Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ggiovinazzo](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ggiovinazzo/32/96111_2.png) [@ggiovinazzo](https://discuss.elastic.co/u/ggiovinazzo)\
**Post date:** [October 20, 2021, 7:53am UTC](https://discuss.elastic.co/t/cannot-start-docker-image-elasticsearch-6-8/287161/1 "2021-10-20T07:53:05Z")

</div>

Hi all,  
This morning I updated my Ubuntu (20.4) dev machine kernel to version **5.4.0-89.100**.  
When restarted my dev instance of Elasticsearch (6.8.2) was crashing with the following exception:

```auto
[2021-10-20T07:09:58,338][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [Atlante] fatal error in thread [elasticsearch[Atlante][search][T#5]], exiting
    java.lang.ClassFormatError: Unknown constant tag 109 in class file org/apache/lucene/store/RAMInputStream$1
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:1016) ~[?:?]

```

For the time being, as a temporary fix, I rolled back to **kernel 5.4.0-88.99** that is working fine.

I didn't dig deeply into the issue, but seems to be related to RAM management in new kernel release and the JRE embedded into docker image (see exception above 😄 )

I'm posting here before filing this issue to github, because I didn't find any information about it, so I suppose is not a confirmed issue.

---

<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:** [November 17, 2021, 7:53am UTC](https://discuss.elastic.co/t/cannot-start-docker-image-elasticsearch-6-8/287161/2 "2021-11-17T07:53:41Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.