fix: make consensus engine wait for a bit before giving up on worker (#774)

and if it happens despite the wait, let worker retry

consensus/clique/clique.go

@@ -648,6 +648,8 @@ func (c *Clique) Seal(chain consensus.ChainHeaderReader, block *types.Block, res
 	// Wait until sealing is terminated or delay timeout.
 	log.Trace("Waiting for slot to sign and propagate", "delay", common.PrettyDuration(delay))
 	go func() {
+		defer close(results)
+
 		select {
 		case <-stop:
 			return
@@ -656,7 +658,7 @@ func (c *Clique) Seal(chain consensus.ChainHeaderReader, block *types.Block, res
 
 		select {
 		case results <- block.WithSeal(header):
-		default:
+		case <-time.After(time.Second):
 			log.Warn("Sealing result is not read by miner", "sealhash", SealHash(header))
 		}
 	}()

miner/scroll_worker.go

@@ -651,8 +651,12 @@ func (w *worker) commit(res *pipeline.Result) error {
 	if err := w.engine.Seal(w.chain, block, resultCh, stopCh); err != nil {
 		return err
 	}
-
+	// Clique.Seal() will only wait for a second before giving up on us. So make sure there is nothing computational heavy
+	// or a call that blocks between the call to Seal and the line below
 	block = <-resultCh
+	if block == nil {
+		return errors.New("missed seal response from consensus engine")
+	}
 
 	// verify the generated block with local consensus engine to make sure everything is as expected
 	if err = w.engine.VerifyHeader(w.chain, block.Header(), true); err != nil {

params/version.go

@@ -24,7 +24,7 @@ import (
 const (
 	VersionMajor = 5         // Major version component of the current release
 	VersionMinor = 3         // Minor version component of the current release
-	VersionPatch = 23        // Patch version component of the current release
+	VersionPatch = 24        // Patch version component of the current release
 	VersionMeta  = "mainnet" // Version metadata to append to the version string
 )