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fix(gas): enforce maxFeePerGas >= maxPriorityFeePerGas (EIP-1559 invariant) #42

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Merged
IvanBelyakoff merged 1 commit into from
Jun 26, 2026
Merged

fix(gas): enforce maxFeePerGas >= maxPriorityFeePerGas (EIP-1559 invariant) #42

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10 changes: 10 additions & 0 deletions internal/loadgen/init.go
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Original file line number Diff line number Diff line change
Expand Up @@ -207,6 +207,16 @@ func (lg *LoadGenerator) runInitialization(req types.StartTestRequest) {
}
}

// EIP-1559 invariant: maxFeePerGas (feeCap) must be >= maxPriorityFeePerGas
// (tipCap), otherwise the node rejects the tx outright. On a quiet chain
// eth_gasPrice (and thus 2x it) can fall below the configured tip, which
// silently fails every transaction. Clamp the fee cap up to the tip.
if lg.gasFeeCap.Cmp(lg.gasTipCap) < 0 {
lg.logger.Warn("gasFeeCap below gasTipCap; raising to tipCap (EIP-1559 invariant)",
"oldFeeCap", lg.gasFeeCap, "tipCap", lg.gasTipCap)
lg.gasFeeCap = new(big.Int).Set(lg.gasTipCap)
}

// CRITICAL: Ensure gasFeeCap is above current baseFee to avoid silent rejections
// Query baseFee directly from latest block and ensure we're at least 2x above it
if baseFee, err := lg.l2Client.GetBaseFee(ctx); err == nil && baseFee > 0 {
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