From d9340ce9124ecc4c3588a411de6868fd8f995074 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Mon, 20 Nov 2017 12:18:52 -0800
Subject: [PATCH] Fix sendrawtransaction hang when sending a tx already in
 mempool

---
 src/rpc/rawtransaction.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index e65959bf0e..3aff1e9fbf 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -970,6 +970,10 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
         }
     } else if (fHaveChain) {
         throw JSONRPCError(RPC_TRANSACTION_ALREADY_IN_CHAIN, "transaction already in block chain");
+    } else {
+        // Make sure we don't block forever if re-sending
+        // a transaction already in mempool.
+        promise.set_value();
     }
 
     } // cs_main