fix(l1): avoid blocking during fullsync

crates/networking/p2p/sync.rs

@@ -531,21 +531,25 @@ impl Syncer {
     ) -> Result<(), (ChainError, Option<BatchBlockProcessingFailure>)> {
         // If we found the sync head, run the blocks sequentially to store all the blocks's state
         if sync_head_found {
-            let mut last_valid_hash = H256::default();
-            for block in blocks {
-                let block_hash = block.hash();
-                blockchain.add_block_pipeline(block).map_err(|e| {
-                    (
-                        e,
-                        Some(BatchBlockProcessingFailure {
-                            last_valid_hash,
-                            failed_block_hash: block_hash,
-                        }),
-                    )
-                })?;
-                last_valid_hash = block_hash;
-            }
-            Ok(())
+            tokio::task::spawn_blocking(move || {
+                let mut last_valid_hash = H256::default();
+                for block in blocks {
+                    let block_hash = block.hash();
+                    blockchain.add_block_pipeline(block).map_err(|e| {
+                        (
+                            e,
+                            Some(BatchBlockProcessingFailure {
+                                last_valid_hash,
+                                failed_block_hash: block_hash,
+                            }),
+                        )
+                    })?;
+                    last_valid_hash = block_hash;
+                }
+                Ok(())
+            })
+            .await
+            .map_err(|e| (ChainError::Custom(e.to_string()), None))?
         } else {
             blockchain.add_blocks_in_batch(blocks, cancel_token).await
         }