From 75529530a26cf3a3cc53909518359b8bd55e4c27 Mon Sep 17 00:00:00 2001
From: Larry <92799281+brilliant-lx@users.noreply.github.com>
Date: Wed, 29 Mar 2023 16:51:48 +0800
Subject: [PATCH] fix: snapshot generation issue after chain reinit from a
 freezer (#1381)

---
 consensus/parlia/parlia.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/consensus/parlia/parlia.go b/consensus/parlia/parlia.go
index b1abc1221f..3fc94e8342 100644
--- a/consensus/parlia/parlia.go
+++ b/consensus/parlia/parlia.go
@@ -454,8 +454,10 @@ func (p *Parlia) snapshot(chain consensus.ChainHeaderReader, number uint64, hash
 			}
 		}
 
-		// If we're at the genesis, snapshot the initial state.
-		if number == 0 {
+		// If we're at the genesis, snapshot the initial state. Alternatively if we have
+		// piled up more headers than allowed to be reorged (chain reinit from a freezer),
+		// consider the checkpoint trusted and snapshot it.
+		if number == 0 || (number%p.config.Epoch == 0 && (len(headers) > params.FullImmutabilityThreshold)) {
 			checkpoint := chain.GetHeaderByNumber(number)
 			if checkpoint != nil {
 				// get checkpoint data