From 07b69c91944e377efe064ea12b0a2135da4d9535 Mon Sep 17 00:00:00 2001
From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com>
Date: Wed, 21 Feb 2024 16:33:51 -0500
Subject: [PATCH] v1.17: validator: ignore too old tower error (backport of
 #35229) (#35278)

validator: ignore too old tower error (#35229)

* validator: ignore too old tower error

* Update core/src/replay_stage.rs

Co-authored-by: Ashwin Sekar <ashwin@solana.com>

* remove redundant references

---------

Co-authored-by: Ashwin Sekar <ashwin@solana.com>
(cherry picked from commit 531793b4be6d6c55f7c6a13f6da1982a7387f185)

Co-authored-by: DimAn <diman@diman.io>
---
 core/src/consensus.rs    | 3 +++
 core/src/replay_stage.rs | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/core/src/consensus.rs b/core/src/consensus.rs
index 816e9d1b5e2af7..59c0adf724346c 100644
--- a/core/src/consensus.rs
+++ b/core/src/consensus.rs
@@ -1449,6 +1449,9 @@ impl TowerError {
             false
         }
     }
+    pub fn is_too_old(&self) -> bool {
+        matches!(self, TowerError::TooOldTower(_, _))
+    }
 }
 
 #[derive(Debug)]
diff --git a/core/src/replay_stage.rs b/core/src/replay_stage.rs
index 317f54e3d71652..aaf4a09d266034 100644
--- a/core/src/replay_stage.rs
+++ b/core/src/replay_stage.rs
@@ -1136,6 +1136,13 @@ impl ReplayStage {
                         node_pubkey,
                         vote_account,
                     )
+                } else if err.is_too_old() {
+                    warn!("Failed to load tower, too old for {}: {}. Creating a new tower from bankforks.", node_pubkey, err);
+                    Tower::new_from_bankforks(
+                        &bank_forks.read().unwrap(),
+                        node_pubkey,
+                        vote_account,
+                    )
                 } else {
                     error!("Failed to load tower for {}: {}", node_pubkey, err);
                     std::process::exit(1);