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Safety alert [11/24/2016]: Consensus bug in geth v1.4.19 and v1.5.2

Safety Alert

Affected configurations: Geth

Severity: Excessive

Abstract:  A difficulty has been recognized with Geth’s journaling mechanism. This prompted a community fork at block #2686351 (Nov-24-2016 14:12:07 UTC). The brand new Geth launch 1.5.3 fixes the journaling problem and repairs the fork.

Particulars: Geth was failing to revert empty account deletions when the transaction inflicting the deletions of empty accounts ended with an an out-of-gas exception. A further problem was present in Parity, the place the Parity consumer incorrectly did not revert empty account deletions in a extra restricted set of contexts involving out-of-gas calls to precompiled contracts; the brand new Geth habits matches Parity’s, and empty accounts will stop to be a supply of concern normally in about one week as soon as the state clearing course of finishes.

The chain that was created from block #2686351 by the previous Geth consumer, which each Parity and the brand new Geth launch take into account invalid, appears to have been largely deserted round block #2686516, that means that ~165 blocks had been mined on the now deserted chain. Transactions are broadcast throughout the community so most transactions are seemingly current on each the previous Geth chain and the present chain, though mining rewards and transaction charges on the previous Geth chain are misplaced. No transactions or blocks on the chain that each shoppers will now settle for will probably be reverted.

The newest geth launch will replace the blockchain from the purpose of the fork, even when it has synced previous the purpose of the fork.

Resolution: Geth 1.5.3 was launched.

In case you are utilizing Geth: Obtain the most recent consumer right here:

In case you are utilizing Mist: Restart Mist and the auto-update function will immediate you to replace the Geth consumer that Mist makes use of to geth 1.5.3.

If you don’t replace, please bear in mind you can be on an invalid chain that isn’t supported.

We proceed to suggest that exchanges and different high-value customers run a number of shoppers and routinely halt operations or in any other case enter protected mode in the event that they exit of sync by greater than ~10 blocks.

Ethereum web sites and cell functions that permit you to retailer ether and/or make transactions are run by third occasion internet based mostly or cell Ethereum suppliers (“Third Social gathering Suppliers”). Third Social gathering Suppliers run their very own Ethereum consumer infrastructure to facilitate their providers. Usually, you don’t want to do something should you use a Third Social gathering Supplier akin to MetaMask, Jaxx, and MyEtherWallet. Nevertheless, they might have directions for you. It’s best to examine along with your Ethereum Third Social gathering Supplier to see what actions, if any, they’re recommending for his or her customers.


That is an emergent and evolving extremely technical area. In the event you select to take part, it is best to know there are lots of dangers concerned together with however not restricted to dangers like sudden bugs and different technical problems that would lead to lack of ether and different penalties. As well as, if you don’t replace to Geth 1.5.3, you can be on an unsupported community. By selecting to make use of the Ethereum platform, you assume the dangers of this emergent platform.



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