Panic: runtime error: slice bounds out of range [:8] with capacity 7

Support
,
1

my weaviate version is 1.19.1,but always “panic: runtime error: slice bounds out of range [:8] with capacity 7“ why?

2

Good morning @user1501,

It’s great to have you here with us and welcome onboard :partying_face: .

This error may relate to Weaviate tries to read or recover from a corrupted segment, or bloom filter file unless manually is needed to remove the corruption.

Could you please upgrade your Weaviate server to the latest version? This panic might have been fixed in newer releases, and your current version is outdated.

If after upgrade, the error persist, please pass me the full panic logs.

Best regards,

Mohamed Shahin
Weaviate Support Engineer
(Ireland, UTC±00:00/+01:00)

3

How should I upgrade? I can’t find any documentation on smooth upgrades. I want to upgrade from 1.19.1 to 1.21.9. Do you have any upgrade suggestions?

4

Morning @user1501,

The following are the major stable releases you need to upgrade to:

1.30.17

1.31.12

1.32.5

I would highly recommend going one release at a time until you reach to 1.32.5 the latest.

You would edit your .yaml file to the version of DB then save then a rollout restart will take affect.

Are you running Weaviate on a Docker or K8S?

Best regards,

Mohamed Shahin
Weaviate Support Engineer
(Ireland, UTC±00:00/+01:00)

5

Yes, I deployed it on K8S, and the data of version 1.19.0 cannot be read when imported into version 1.32.X.

6

I’m not entirely sure what you mean by “cannot be read in 1.32.”

Could you please provide more details, including the error logs, and also share your Kubernetes deployment file so I can take a closer look?

Best regards,

Mohamed Shahin
Weaviate Support Engineer
(Ireland, UTC±00:00/+01:00)

7

I’ve actually been through this exact same panic error before, and Mohamed’s advice is spot on. I hit the same slice bounds issue on an older version too.

From experience, I can’t stress this enough: do incremental upgrades. I once tried jumping from 1.19 straight to a much newer version and it was a nightmare, corrupted data, schema inconsistencies, random crashes. Taking it step by step saved me a much of pain.

A few things I’d recommend before starting:

  • Backup everything. I learned this the hard way after losing a week’s worth of data during a failed upgrade.

  • Test on a copy first. I now always spin up a duplicate environment before touching production.

The upgrade path that worked well for me:

  1. 1.30.17 – cleared up a lot of the corruption issues.

  2. 1.31.12 – improved error handling significantly.

  3. 1.32.5 – has been rock solid for me, no panic errors since.

At each step I’d let the system run for a day or two just to make sure everything was stable before moving on.

Some practical tips:

  • Docker: update your docker-compose.yml and run

    docker-compose pull && docker-compose up -d

  • Kubernetes: update the deployment and let it roll out gradually.

  • Enable debug logging before upgrading:

    LOG_LEVEL=debug

    This gives way more visibility into what’s happening if something goes wrong.

Once you get through this upgrade path, Weaviate becomes much more stable. Good luck :crossed_fingers: and I’d love to hear how it goes for you.

1 Like
8

Thank you so much @Chaitanya_Kulthe Absolutely and nicely structured. I do highly recommend this as per the upgrade path:

  • At each step I’d let the system run for a day or two just to make sure everything was stable before moving on.

Best regards,

Mohamed Shahin
Weaviate Support Engineer
(Ireland, UTC±00:00/+01:00)

1 Like