Avoid setting minInclusionBlock to math.MaxUint64 (will cause channel…

… timeouts if ChannelTimeout == 1 because 0-math.MaxUint64 == 1)

op-batcher/batcher/channel.go

@@ -2,7 +2,6 @@ package batcher
 
 import (
 	"fmt"
-	"math"
 
 	"github.com/ethereum-optimism/optimism/op-batcher/metrics"
 	"github.com/ethereum-optimism/optimism/op-node/rollup"
@@ -45,7 +44,6 @@ func newChannel(log log.Logger, metr metrics.Metricer, cfg ChannelConfig, rollup
 		channelBuilder:        cb,
 		pendingTransactions:   make(map[string]txData),
 		confirmedTransactions: make(map[string]eth.BlockID),
-		minInclusionBlock:     uint64(math.MaxUint64),
 	}, nil
 }
 
@@ -84,7 +82,11 @@ func (s *channel) TxConfirmed(id string, inclusionBlock eth.BlockID) (bool, []*t
 	s.channelBuilder.FramePublished(inclusionBlock.Number)
 
 	// Update min/max inclusion blocks for timeout check
-	s.minInclusionBlock = min(s.minInclusionBlock, inclusionBlock.Number)
+	if s.minInclusionBlock == 0 {
+		s.minInclusionBlock = inclusionBlock.Number
+	} else {
+		s.minInclusionBlock = min(s.minInclusionBlock, inclusionBlock.Number)
+	}
 	s.maxInclusionBlock = max(s.maxInclusionBlock, inclusionBlock.Number)
 
 	// If this channel timed out, put the pending blocks back into the local saved blocks