Hotfix:

- downgrade go-ethereum to v1.15.3
- re-add missing code in outcome generation

Based on a1b823f6dc40edaa950158e15aa454bfd71dd49b

Author: kaleofduty

go.mod

@@ -5,7 +5,7 @@ go 1.23.0
 toolchain go1.23.6
 
 require (
-	github.com/ethereum/go-ethereum v1.15.6
+	github.com/ethereum/go-ethereum v1.15.3
 	github.com/leanovate/gopter v0.2.11
 	github.com/mr-tron/base58 v1.2.0
 	github.com/pkg/errors v0.9.1

go.sum

@@ -59,8 +59,8 @@ github.com/deepmap/oapi-codegen v1.8.2/go.mod h1:YLgSKSDv/bZQB7N4ws6luhozi3cEdRk
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/ethereum/c-kzg-4844 v1.0.3 h1:IEnbOHwjixW2cTvKRUlAAUOeleV7nNM/umJR+qy4WDs=
 github.com/ethereum/c-kzg-4844 v1.0.3/go.mod h1:VewdlzQmpT5QSrVhbBuGoCdFJkpaJlO1aQputP83wc0=
-github.com/ethereum/go-ethereum v1.15.6 h1:jgLoUM6/pNjp0uEnXyWcWikDwa4j1wZlcqkX8Pm8A+I=
-github.com/ethereum/go-ethereum v1.15.6/go.mod h1:+S9k+jFzlyVTNcYGvqFhzN/SFhI6vA+aOY4T5tLSPL0=
+github.com/ethereum/go-ethereum v1.15.3 h1:OeTWAq6r8iR89bfJDjmmOemE74ywArl9DUViFsVj3Y8=
+github.com/ethereum/go-ethereum v1.15.3/go.mod h1:jMXlpZXfSar1mGs/5sB0aEpEnPsiE1Jn6/3anlueqz8=
 github.com/ethereum/go-verkle v0.2.2 h1:I2W0WjnrFUIzzVPwm8ykY+7pL2d4VhlsePn4j7cnFk8=
 github.com/ethereum/go-verkle v0.2.2/go.mod h1:M3b90YRnzqKyyzBEWJGqj8Qff4IDeXnzFw0P9bFw3uk=
 github.com/ferranbt/fastssz v0.1.2 h1:Dky6dXlngF6Qjc+EfDipAkE83N5I5DE68bY6O0VLNPk=

offchainreporting2plus/internal/ocr3/protocol/outcome_generation_leader.go

@@ -79,7 +79,7 @@ func (outgen *outcomeGenerationState[RI]) messageEpochStartRequest(msg MessageEp
 		return
 	}
 
-	notBadCount := 0 // Note: just because a request is not bad does not mean it's good. Tertium datur!
+	notBadCount := 0 // Note: just because a request is not marked bad does not mean it's good. Tertium datur!
 	for _, epochStartRequest := range outgen.leaderState.epochStartRequests {
 		if epochStartRequest.bad {
 			continue
@@ -91,18 +91,26 @@ func (outgen *outcomeGenerationState[RI]) messageEpochStartRequest(msg MessageEp
 		return
 	}
 
+	// The not-bad entries in epochStartRequests here are guaranteed to be
+	// nonempty due to definition of ByzQuorumSize.
 	var maxSender *commontypes.OracleID
 	for sender, epochStartRequest := range outgen.leaderState.epochStartRequests {
+		if epochStartRequest.bad {
+			continue
+		}
 		if maxSender != nil {
 			maxTimestamp := outgen.leaderState.epochStartRequests[*maxSender].message.HighestCertified.Timestamp()
 			if !maxTimestamp.Less31(epochStartRequest.message.HighestCertified.Timestamp()) {
 				continue
 			}
 		}
-
 		maxSender = &sender
 	}
 
+	if maxSender == nil {
+		return
+	}
+
 	maxRequest := outgen.leaderState.epochStartRequests[*maxSender]
 
 	if !maxRequest.message.HighestCertified.Timestamp().Equal(maxRequest.message.SignedHighestCertifiedTimestamp.HighestCertifiedTimestamp) {