# Gaia-6002 Postmortem

**URL:** <https://forum.cosmos.network/t/gaia-6002-postmortem/463>\
**Category:** Validation\
**Created:** [July 12, 2018, 6:32pm UTC](https://forum.cosmos.network/t/gaia-6002-postmortem/463 "2018-07-12T18:32:26Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![cwgoes](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.cosmos.network/cwgoes/32/323_2.png) [@cwgoes](https://forum.cosmos.network/u/cwgoes)\
**Post date:** [July 12, 2018, 6:32pm UTC](https://forum.cosmos.network/t/gaia-6002-postmortem/463/1 "2018-07-12T18:32:26Z")

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The last testnet, gaia-6002, [halted](https://github.com/cosmos/cosmos-sdk/issues/1496) about a week and a half ago. The development team has since isolated root causes, debugged, and pushed fixes for all discovered issues (see the [tracker](https://github.com/cosmos/cosmos-sdk/issues/1517) and individual explanations on each issue).

These bugs were primarily caused by several subtle edge cases in the staking/slashing logic, which tends to be complex since it must implement Cosmos’s proof-of-stake algorithm in an efficient manner for an unbounded number of validator candidates, delegators per validator, and validators per delegate. We are taking multiple steps to avoid such bugs in the future: [simplifying the validator update logic](https://github.com/cosmos/cosmos-sdk/issues/1584), [writing a randomized simulation testsuite](https://github.com/cosmos/cosmos-sdk/pull/1620), and experimenting with new methods of collaborative code review.

Meticulous user-submitted bug reports have been instrumental in our debugging. Please continue to submit issues to the Cosmos SDK repository for possible state machine errors and UX flaws alike, and make sure to include the steps to replicate your situation or relevant transactions / block heights for actions taken on a live testnet.

Cheers - see you on the new testnet, gaia-7000, launching soon!

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<div class="post-metadata">

**Author:** ![melea-trust](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.cosmos.network/melea-trust/32/90_2.png) [@melea-trust](https://forum.cosmos.network/u/melea-trust)\
**Post date:** [July 12, 2018, 6:38pm UTC](https://forum.cosmos.network/t/gaia-6002-postmortem/463/2 "2018-07-12T18:38:28Z")

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Thanks just lets wait for gaia-7000 🌈

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**Author:** ![kwunyeung](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.cosmos.network/kwunyeung/32/68_2.png) [@kwunyeung](https://forum.cosmos.network/u/kwunyeung)\
**Post date:** [July 12, 2018, 6:59pm UTC](https://forum.cosmos.network/t/gaia-6002-postmortem/463/3 "2018-07-12T18:59:11Z")

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Excellent! Can’t wait for gaia-7000!

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**Author:** ![7768](https://avatars.discourse-cdn.com/v4/letter/7/c68b51/32.png) [@7768](https://forum.cosmos.network/u/7768)\
**Post date:** [July 12, 2018, 7:34pm UTC](https://forum.cosmos.network/t/gaia-6002-postmortem/463/4 "2018-07-12T19:34:10Z")

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Great update. Thank you. Look forward to the next testnet!

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<div class="post-metadata">

**Author:** ![melea-trust](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.cosmos.network/melea-trust/32/90_2.png) [@melea-trust](https://forum.cosmos.network/u/melea-trust)\
**Post date:** [July 13, 2018, 11:35am UTC](https://forum.cosmos.network/t/gaia-6002-postmortem/463/5 "2018-07-13T11:35:03Z")

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> <https://github.com/tendermint/tendermint/issues/1846>

Just for my understands.  
This issue is open and now in Tendermint; so, is not resolved yet. for the gaia-7000 for example.

And is related to the update from Terdermint and not for Cosmos.  
I am ok?

Because if i am ok.  
Validator need to set  
Pex=true  
In gaia-7000.  
And waith for the update from Tendermint for can uses  
Pex=false  
For work with sentrys, and don’t get off-line

Just that.