From c510f823e7858d288e64b2a7c4149e1e155fac13 Mon Sep 17 00:00:00 2001
From: Anton Kaliaev <anton.kalyaev@gmail.com>
Date: Mon, 17 Dec 2018 20:35:05 +0400
Subject: [PATCH 1/2] mempool: move tx to back, not front (#3036)

because we pop txs from the front if the cache is full

Refs #3035
---
 mempool/mempool.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mempool/mempool.go b/mempool/mempool.go
index c5f966c4e..3a1921bc2 100644
--- a/mempool/mempool.go
+++ b/mempool/mempool.go
@@ -676,7 +676,7 @@ func (cache *mapTxCache) Push(tx types.Tx) bool {
 	// Use the tx hash in the cache
 	txHash := sha256.Sum256(tx)
 	if moved, exists := cache.map_[txHash]; exists {
-		cache.list.MoveToFront(moved)
+		cache.list.MoveToBack(moved)
 		return false
 	}
 

From c6604b5a9b74c8de242ac9b033edb4f833c9a2d1 Mon Sep 17 00:00:00 2001
From: Ethan Buchman <ethan@coinculture.info>
Date: Fri, 21 Dec 2018 16:31:28 -0500
Subject: [PATCH 2/2] changelog and version

---
 CHANGELOG.md       | 10 ++++++++++
 version/version.go |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0397ebdb5..46e9cb374 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## v0.27.4
+
+*December 21st, 2018*
+
+### BUG FIXES:
+
+- [mempool] [\#3036](https://github.com/tendermint/tendermint/issues/3036) Fix
+  LRU cache by popping the least recently used item when the cache is full,
+  not the most recently used one!
+
 ## v0.27.3
 
 *December 16th, 2018*
diff --git a/version/version.go b/version/version.go
index ace1b41d2..3cbdab02f 100644
--- a/version/version.go
+++ b/version/version.go
@@ -18,7 +18,7 @@ const (
 	// TMCoreSemVer is the current version of Tendermint Core.
 	// It's the Semantic Version of the software.
 	// Must be a string because scripts like dist.sh read this file.
-	TMCoreSemVer = "0.27.3"
+	TMCoreSemVer = "0.27.4"
 
 	// ABCISemVer is the semantic version of the ABCI library
 	ABCISemVer  = "0.15.0"