From 0e99b454a3add2215490fa6888a4f70400f3f99d Mon Sep 17 00:00:00 2001
From: Eitan Seri-Levi <eserilev@ucsc.edu>
Date: Sun, 24 May 2026 11:09:51 +0300
Subject: [PATCH] Fixes

---
 .../src/scheduler/work_reprocessing_queue.rs  | 35 +++++++++++++++----
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/beacon_node/beacon_processor/src/scheduler/work_reprocessing_queue.rs b/beacon_node/beacon_processor/src/scheduler/work_reprocessing_queue.rs
index d9b8687444..47d7e834a0 100644
--- a/beacon_node/beacon_processor/src/scheduler/work_reprocessing_queue.rs
+++ b/beacon_node/beacon_processor/src/scheduler/work_reprocessing_queue.rs
@@ -52,6 +52,9 @@ pub const QUEUED_ATTESTATION_DELAY: Duration = Duration::from_secs(12);
 /// For how long to queue light client updates for re-processing.
 pub const QUEUED_LIGHT_CLIENT_UPDATE_DELAY: Duration = Duration::from_secs(12);
 
+/// For how long to queue gossip data columns awaiting their block for re-processing.
+pub const QUEUED_GOSSIP_DATA_COLUMN_DELAY: Duration = Duration::from_secs(12);
+
 /// Envelope timeout as a multiplier of slot duration. Envelopes waiting for their block will be
 /// sent for processing after this many slots worth of time, even if the block hasn't arrived.
 const QUEUED_ENVELOPE_DELAY_SLOTS: u32 = 1;
@@ -302,6 +305,8 @@ struct ReprocessQueue<S> {
     queued_backfill_batches: Vec<QueuedBackfillBatch>,
     /// Queued gossip data columns awaiting their block, keyed by block root.
     awaiting_data_columns_per_root: HashMap<Hash256, (Vec<QueuedGossipDataColumn>, DelayKey)>,
+    /// Total number of queued gossip data columns across all roots.
+    queued_data_columns_count: usize,
 
     /* Aux */
     /// Next attestation id, used for both aggregated and unaggregated attestations
@@ -312,6 +317,7 @@ struct ReprocessQueue<S> {
     rpc_block_debounce: TimeLatch,
     attestation_delay_debounce: TimeLatch,
     lc_update_delay_debounce: TimeLatch,
+    data_column_delay_debounce: TimeLatch,
     next_backfill_batch_event: Option<Pin<Box<tokio::time::Sleep>>>,
     slot_clock: Arc<S>,
 }
@@ -491,6 +497,7 @@ impl<S: SlotClock> ReprocessQueue<S> {
             queued_backfill_batches: Vec::new(),
             queued_column_reconstructions: HashMap::new(),
             awaiting_data_columns_per_root: HashMap::new(),
+            queued_data_columns_count: 0,
             next_attestation: 0,
             next_lc_update: 0,
             early_block_debounce: TimeLatch::default(),
@@ -498,6 +505,7 @@ impl<S: SlotClock> ReprocessQueue<S> {
             rpc_block_debounce: TimeLatch::default(),
             attestation_delay_debounce: TimeLatch::default(),
             lc_update_delay_debounce: TimeLatch::default(),
+            data_column_delay_debounce: TimeLatch::default(),
             next_backfill_batch_event: None,
             slot_clock,
         }
@@ -718,23 +726,32 @@ impl<S: SlotClock> ReprocessQueue<S> {
             InboundEvent::Msg(UnknownBlockDataColumn(queued_data_column)) => {
                 let block_root = queued_data_column.beacon_block_root;
 
+                if self.queued_data_columns_count >= MAXIMUM_QUEUED_DATA_COLUMNS {
+                    if self.data_column_delay_debounce.elapsed() {
+                        warn!(
+                            queue_size = MAXIMUM_QUEUED_DATA_COLUMNS,
+                            msg = "system resources may be saturated",
+                            "Data column delay queue is full, dropping column"
+                        );
+                    }
+                    return;
+                }
+
                 if let Some((columns, _delay_key)) =
                     self.awaiting_data_columns_per_root.get_mut(&block_root)
                 {
                     // Append to existing entry; the timer for this root is already running.
                     columns.push(queued_data_column);
                 } else {
-                    if self.awaiting_data_columns_per_root.len() >= MAXIMUM_QUEUED_DATA_COLUMNS {
-                        return;
-                    }
-
                     let delay_key = self
                         .data_columns_delay_queue
-                        .insert(block_root, QUEUED_ATTESTATION_DELAY);
+                        .insert(block_root, QUEUED_GOSSIP_DATA_COLUMN_DELAY);
 
                     self.awaiting_data_columns_per_root
                         .insert(block_root, (vec![queued_data_column], delay_key));
                 }
+
+                self.queued_data_columns_count += 1;
             }
             InboundEvent::Msg(UnknownLightClientOptimisticUpdate(
                 queued_light_client_optimistic_update,
@@ -854,6 +871,9 @@ impl<S: SlotClock> ReprocessQueue<S> {
                     self.awaiting_data_columns_per_root.remove(&block_root)
                 {
                     self.data_columns_delay_queue.remove(&delay_key);
+                    self.queued_data_columns_count = self
+                        .queued_data_columns_count
+                        .saturating_sub(data_columns.len());
                     for data_column in data_columns {
                         if self
                             .ready_work_tx
@@ -1121,6 +1141,9 @@ impl<S: SlotClock> ReprocessQueue<S> {
                 if let Some((data_columns, _)) =
                     self.awaiting_data_columns_per_root.remove(&block_root)
                 {
+                    self.queued_data_columns_count = self
+                        .queued_data_columns_count
+                        .saturating_sub(data_columns.len());
                     for data_column in data_columns {
                         if self
                             .ready_work_tx
@@ -1779,7 +1802,7 @@ mod tests {
         );
 
         // Advance time past the delay so the entry expires.
-        advance_time(&queue.slot_clock, 2 * QUEUED_ATTESTATION_DELAY).await;
+        advance_time(&queue.slot_clock, 2 * QUEUED_GOSSIP_DATA_COLUMN_DELAY).await;
         let ready_msg = queue.next().await.unwrap();
         assert!(matches!(ready_msg, InboundEvent::ReadyDataColumn(_)));
         queue.handle_message(ready_msg);