Changing Gas metering could actually make smart contracts fail? Ethereum urgently halts the Hoodi fork to investigate eight major security risks.

Ethereum core developers halted the Hoodi testnet upgrade after security auditors found that two upcoming gas-repricing proposals, EIP-8037 and EIP-8038, could break deployed smart contracts that rely on fixed gas assumptions. ChainSecurity identified eight "invariants" at risk, including hardcoded gas limits on sub-contract calls that could cause cross-contract calls to revert out of gas, and fault-tolerance logic that depends on predictable gas consumption or fixed proportional gas forwarding, potentially trapping funds in incomplete state-machine branches. The Ethereum Foundation published a public audit repository detailing the eight affected invariants with code samples and scanner prompts, warning that off-chain routing, settlement scripts and liquidation bots may also be affected. Developers agreed not to hard-fork Hoodi until the scope of impacted contracts is mapped and compatibility guidance is issued, to avoid cascading failures in multisigs, bridges and lending protocols. The first self-audit data will be reviewed at next week's ACD meeting, when Hoodi activation conditions will be reassessed.