From a9af415887f03cb2565895bc55be72748549e527 Mon Sep 17 00:00:00 2001
From: Alex Morcos <morcos@chaincode.com>
Date: Wed, 11 Mar 2015 11:56:44 -0400
Subject: [PATCH 1/2] fix InvalidateBlock to repopulate setBlockIndexCandidates

---
 src/main.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.cpp b/src/main.cpp
index 6bbb3bc13..9b4bb4312 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2311,7 +2311,7 @@ bool InvalidateBlock(CValidationState& state, CBlockIndex *pindex) {
     BlockMap::iterator it = mapBlockIndex.begin();
     while (it != mapBlockIndex.end()) {
         if (it->second->IsValid(BLOCK_VALID_TRANSACTIONS) && it->second->nChainTx && setBlockIndexCandidates.value_comp()(chainActive.Tip(), it->second)) {
-            setBlockIndexCandidates.insert(pindex);
+            setBlockIndexCandidates.insert(it->second);
         }
         it++;
     }

From 88f6c8c3657cba81c65da34a7161c860c8a23c5f Mon Sep 17 00:00:00 2001
From: Alex Morcos <morcos@chaincode.com>
Date: Wed, 11 Mar 2015 11:58:40 -0400
Subject: [PATCH 2/2] add RPC test for InvalidateBlock

---
 qa/rpc-tests/invalidateblock.py | 51 +++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100755 qa/rpc-tests/invalidateblock.py

diff --git a/qa/rpc-tests/invalidateblock.py b/qa/rpc-tests/invalidateblock.py
new file mode 100755
index 000000000..a8bfbe6e6
--- /dev/null
+++ b/qa/rpc-tests/invalidateblock.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python2
+# Copyright (c) 2014 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#
+# Test InvalidateBlock code
+#
+
+from test_framework import BitcoinTestFramework
+from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
+from util import *
+
+class InvalidateTest(BitcoinTestFramework):
+    
+        
+    def setup_chain(self):
+        print("Initializing test directory "+self.options.tmpdir)
+        initialize_chain_clean(self.options.tmpdir, 2)
+                 
+    def setup_network(self):
+        self.nodes = []
+        self.is_network_split = False 
+        self.nodes.append(start_node(0, self.options.tmpdir, ["-debug"]))
+        self.nodes.append(start_node(1, self.options.tmpdir, ["-debug"]))
+        
+    def run_test(self):
+        print "Mine 4 blocks on Node 0"
+        self.nodes[0].setgenerate(True, 4)
+        assert(self.nodes[0].getblockcount() == 4)
+        besthash = self.nodes[0].getbestblockhash()
+
+        print "Mine competing 6 blocks on Node 1"
+        self.nodes[1].setgenerate(True, 6)
+        assert(self.nodes[1].getblockcount() == 6)
+
+        print "Connect nodes to force a reorg"
+        connect_nodes_bi(self.nodes,0,1)
+        sync_blocks(self.nodes)
+        assert(self.nodes[0].getblockcount() == 6)
+        badhash = self.nodes[1].getblockhash(2)
+
+        print "Invalidate block 2 on node 0 and verify we reorg to node 0's original chain"
+        self.nodes[0].invalidateblock(badhash)
+        newheight = self.nodes[0].getblockcount()
+        newhash = self.nodes[0].getbestblockhash()
+        if (newheight != 4 or newhash != besthash):
+            raise AssertionError("Wrong tip for node0, hash %s, height %d"%(newhash,newheight))
+
+if __name__ == '__main__':
+    InvalidateTest().main()