Merge #11022: Basic keypool topup

d34957e [wallet] [tests] Add keypool topup functional test (Jonas Schnelli)
095142d [wallet] keypool mark-used and topup (John Newbery)
c25d90f [wallet] Add HasUnusedKeys() helper (John Newbery)
f2123e3 [wallet] Cache keyid -> keypool id mappings (John Newbery)
83f1ec3 [wallet] Don't hold cs_LastBlockFile while calling setBestChain (John Newbery)
2376bfc [wallet] [moveonly] Move LoadKeyPool to cpp (Matt Corallo)
cab8557 [wallet] [moveonly] Move CAffectedKeysVisitor (Jonas Schnelli)

Pull request description:

  This PR contains the first part of #10882 :

  - if a key from the keypool is used, mark all keys up to that key as used, and then try to top up the keypool
  - top up the keypool on startup

  Notably, it does not stop the node or prevent the best block from advancing if the keypool drops below a threshold (which means that transactions may be missed and funds lost if restoring from an old HD wallet backup).

Tree-SHA512: ac681fefeaf7ec2aab2fa1da93d12273ea80bd05eb48d7b3b551ea6e5d975dd97ba7de52b7fba52993823280ac4079cc36cf78a27dac708107ebf8fb6326142b

src/validation.cpp

@@ -2218,13 +2218,17 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
  */
 bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &state, FlushStateMode mode, int nManualPruneHeight) {
     int64_t nMempoolUsage = mempool.DynamicMemoryUsage();
-    LOCK2(cs_main, cs_LastBlockFile);
+    LOCK(cs_main);
     static int64_t nLastWrite = 0;
     static int64_t nLastFlush = 0;
     static int64_t nLastSetChain = 0;
     std::set<int> setFilesToPrune;
     bool fFlushForPrune = false;
+    bool fDoFullFlush = false;
+    int64_t nNow = 0;
     try {
+    {
+        LOCK(cs_LastBlockFile);
         if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) && !fReindex) {
             if (nManualPruneHeight > 0) {
                 FindFilesToPruneManual(setFilesToPrune, nManualPruneHeight);
@@ -2240,7 +2244,7 @@ bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &
                 }
             }
         }
-    int64_t nNow = GetTimeMicros();
+        nNow = GetTimeMicros();
         // Avoid writing/flushing immediately after startup.
         if (nLastWrite == 0) {
             nLastWrite = nNow;
@@ -2264,7 +2268,7 @@ bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &
         // It's been very long since we flushed the cache. Do this infrequently, to optimize cache usage.
         bool fPeriodicFlush = mode == FLUSH_STATE_PERIODIC && nNow > nLastFlush + (int64_t)DATABASE_FLUSH_INTERVAL * 1000000;
         // Combine all conditions that result in a full cache flush.
-    bool fDoFullFlush = (mode == FLUSH_STATE_ALWAYS) || fCacheLarge || fCacheCritical || fPeriodicFlush || fFlushForPrune;
+        fDoFullFlush = (mode == FLUSH_STATE_ALWAYS) || fCacheLarge || fCacheCritical || fPeriodicFlush || fFlushForPrune;
         // Write blocks and block index to disk.
         if (fDoFullFlush || fPeriodicWrite) {
             // Depend on nMinDiskSpace to ensure we can write block index
@@ -2312,6 +2316,7 @@ bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &
         }
             nLastFlush = nNow;
         }
+    }
     if (fDoFullFlush || ((mode == FLUSH_STATE_ALWAYS || mode == FLUSH_STATE_PERIODIC) && nNow > nLastSetChain + (int64_t)DATABASE_WRITE_INTERVAL * 1000000)) {
         // Update best block in wallet (so we can detect restored wallets).
         GetMainSignals().SetBestChain(chainActive.GetLocator());

src/wallet/rpcdump.cpp

@@ -792,9 +792,8 @@ UniValue dumpwallet(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot open wallet dump file");
 
     std::map<CTxDestination, int64_t> mapKeyBirth;
-    std::set<CKeyID> setKeyPool;
+    const std::map<CKeyID, int64_t>& mapKeyPool = pwallet->GetAllReserveKeys();
     pwallet->GetKeyBirthTimes(mapKeyBirth);
-    pwallet->GetAllReserveKeys(setKeyPool);
 
     // sort time/key pairs
     std::vector<std::pair<int64_t, CKeyID> > vKeyBirth;
@@ -873,7 +872,7 @@ UniValue dumpwallet(const JSONRPCRequest& request)
             file << strprintf("%s %s ", CBitcoinSecret(key).ToString(), strTime);
             if (pwallet->mapAddressBook.count(keyid)) {
                 file << strprintf("label=%s", EncodeDumpString(pwallet->mapAddressBook[keyid].name));
-            } else if (setKeyPool.count(keyid)) {
+            } else if (mapKeyPool.count(keyid)) {
                 file << "reserve=1";
             } else {
                 file << "change=1";

src/wallet/wallet.cpp

@@ -13,6 +13,7 @@
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
 #include "fs.h"
+#include "init.h"
 #include "key.h"
 #include "keystore.h"
 #include "validation.h"
@@ -88,6 +89,38 @@ std::string COutput::ToString() const
     return strprintf("COutput(%s, %d, %d) [%s]", tx->GetHash().ToString(), i, nDepth, FormatMoney(tx->tx->vout[i].nValue));
 }
 
+class CAffectedKeysVisitor : public boost::static_visitor<void> {
+private:
+    const CKeyStore &keystore;
+    std::vector<CKeyID> &vKeys;
+
+public:
+    CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}
+
+    void Process(const CScript &script) {
+        txnouttype type;
+        std::vector<CTxDestination> vDest;
+        int nRequired;
+        if (ExtractDestinations(script, type, vDest, nRequired)) {
+            for (const CTxDestination &dest : vDest)
+                boost::apply_visitor(*this, dest);
+        }
+    }
+
+    void operator()(const CKeyID &keyId) {
+        if (keystore.HaveKey(keyId))
+            vKeys.push_back(keyId);
+    }
+
+    void operator()(const CScriptID &scriptId) {
+        CScript script;
+        if (keystore.GetCScript(scriptId, script))
+            Process(script);
+    }
+
+    void operator()(const CNoDestination &none) {}
+};
+
 int COutput::Priority() const
 {
     for (const auto& d : CPrivateSend::GetStandardDenominations()) {
@@ -1208,6 +1241,30 @@ bool CWallet::AddToWalletIfInvolvingMe(const CTransactionRef& ptx, const CBlockI
         if (fExisted && !fUpdate) return false;
         if (fExisted || IsMine(tx) || IsFromMe(tx))
         {
+            /* Check if any keys in the wallet keypool that were supposed to be unused
+             * have appeared in a new transaction. If so, remove those keys from the keypool.
+             * This can happen when restoring an old wallet backup that does not contain
+             * the mostly recently created transactions from newer versions of the wallet.
+             */
+
+            // loop though all outputs
+            for (const CTxOut& txout: tx.vout) {
+                // extract addresses and check if they match with an unused keypool key
+                std::vector<CKeyID> vAffected;
+                CAffectedKeysVisitor(*this, vAffected).Process(txout.scriptPubKey);
+                for (const CKeyID &keyid : vAffected) {
+                    std::map<CKeyID, int64_t>::const_iterator mi = m_pool_key_to_index.find(keyid);
+                    if (mi != m_pool_key_to_index.end()) {
+                        LogPrintf("%s: Detected a used keypool key, mark all keypool key up to this key as used\n", __func__);
+                        MarkReserveKeysAsUsed(mi->second);
+
+                        if (!TopUpKeyPool()) {
+                            LogPrintf("%s: Topping up keypool failed (locked wallet)\n", __func__);
+                        }
+                    }
+                }
+            }
+
             CWalletTx wtx(this, ptx);
 
             // Get merkle branch if transaction was found in a block
@@ -4097,6 +4154,7 @@ DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
             setInternalKeyPool.clear();
             setExternalKeyPool.clear();
             nKeysLeftSinceAutoBackup = 0;
+            m_pool_key_to_index.clear();
             // Note: can't top-up keypool here, because wallet is locked.
             // User will be prompted to unlock wallet the next operation
             // that requires a new key.
@@ -4155,6 +4213,7 @@ DBErrors CWallet::ZapSelectTx(std::vector<uint256>& vHashIn, std::vector<uint256
         {
             setInternalKeyPool.clear();
             setExternalKeyPool.clear();
+            m_pool_key_to_index.clear();
             // Note: can't top-up keypool here, because wallet is locked.
             // User will be prompted to unlock wallet the next operation
             // that requires a new key.
@@ -4182,6 +4241,7 @@ DBErrors CWallet::ZapWalletTx(std::vector<CWalletTx>& vWtx)
             setInternalKeyPool.clear();
             setExternalKeyPool.clear();
             nKeysLeftSinceAutoBackup = 0;
+            m_pool_key_to_index.clear();
             // Note: can't top-up keypool here, because wallet is locked.
             // User will be prompted to unlock wallet the next operation
             // that requires a new key.
@@ -4276,6 +4336,8 @@ bool CWallet::NewKeyPool()
         privateSendClient.fPrivateSendRunning = false;
         nKeysLeftSinceAutoBackup = 0;
 
+        m_pool_key_to_index.clear();
+
         if (!TopUpKeyPool())
             return false;
 
@@ -4290,6 +4352,25 @@ size_t CWallet::KeypoolCountExternalKeys()
     return setExternalKeyPool.size();
 }
 
+void CWallet::LoadKeyPool(int64_t nIndex, const CKeyPool &keypool)
+{
+    AssertLockHeld(cs_wallet);
+    if (keypool.fInternal) {
+        setInternalKeyPool.insert(nIndex);
+    } else {
+        setExternalKeyPool.insert(nIndex);
+    }
+    m_max_keypool_index = std::max(m_max_keypool_index, nIndex);
+    m_pool_key_to_index[keypool.vchPubKey.GetID()] = nIndex;
+
+    // If no metadata exists yet, create a default with the pool key's
+    // creation time. Note that this may be overwritten by actually
+    // stored metadata for that key later, which is fine.
+    CKeyID keyid = keypool.vchPubKey.GetID();
+    if (mapKeyMetadata.count(keyid) == 0)
+        mapKeyMetadata[keyid] = CKeyMetadata(keypool.nTime);
+}
+
 size_t CWallet::KeypoolCountInternalKeys()
 {
     AssertLockHeld(cs_wallet); // setInternalKeyPool
@@ -4336,7 +4417,8 @@ bool CWallet::TopUpKeyPool(unsigned int kpSize)
             assert(m_max_keypool_index < std::numeric_limits<int64_t>::max()); // How in the hell did you use so many keys?
             int64_t index = ++m_max_keypool_index;
 
-            if (!walletdb.WritePool(index, CKeyPool(GenerateNewKey(walletdb, 0, fInternal), fInternal))) {
+            CPubKey pubkey(GenerateNewKey(walletdb, fInternal));
+            if (!walletdb.WritePool(index, CKeyPool(pubkey, fInternal))) {
                 throw std::runtime_error(std::string(__func__) + ": writing generated key failed");
             }
 
@@ -4346,6 +4428,8 @@ bool CWallet::TopUpKeyPool(unsigned int kpSize)
                 setExternalKeyPool.insert(index);
             }
 
+            m_pool_key_to_index[pubkey.GetID()] = index;
+
             if (missingInternal + missingExternal > 0) {
                 LogPrintf("keypool added %d keys (%d internal), size=%u (%u internal)\n",
                           missingInternal + missingExternal, missingInternal,
@@ -4392,6 +4476,7 @@ void CWallet::ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool, bool fIn
         }
 
         assert(keypool.vchPubKey.IsValid());
+        m_pool_key_to_index.erase(keypool.vchPubKey.GetID());
         LogPrintf("keypool reserve %d\n", nIndex);
     }
 }
@@ -4407,7 +4492,7 @@ void CWallet::KeepKey(int64_t nIndex)
     LogPrintf("keypool keep %d\n", nIndex);
 }
 
-void CWallet::ReturnKey(int64_t nIndex, bool fInternal)
+void CWallet::ReturnKey(int64_t nIndex, bool fInternal, const CPubKey& pubkey)
 {
     // Return to key pool
     {
@@ -4417,6 +4502,7 @@ void CWallet::ReturnKey(int64_t nIndex, bool fInternal)
         } else {
             setExternalKeyPool.insert(nIndex);
         }
+        m_pool_key_to_index[pubkey.GetID()] = nIndex;
     }
     LogPrintf("keypool return %d\n", nIndex);
 }
@@ -4652,40 +4738,37 @@ void CReserveKey::KeepKey()
 void CReserveKey::ReturnKey()
 {
     if (nIndex != -1) {
-        pwallet->ReturnKey(nIndex, fInternal);
+        pwallet->ReturnKey(nIndex, fInternal, vchPubKey);
     }
     nIndex = -1;
     vchPubKey = CPubKey();
 }
 
-static void LoadReserveKeysToSet(std::set<CKeyID>& setAddress, const std::set<int64_t>& setKeyPool, CWalletDB& walletdb)
+void CWallet::MarkReserveKeysAsUsed(int64_t keypool_id)
 {
-    for (const int64_t& id : setKeyPool)
+    AssertLockHeld(cs_wallet);
-    {
+    bool internal = setInternalKeyPool.count(keypool_id);
-        CKeyPool keypool;
+    if (!internal) assert(setExternalKeyPool.count(keypool_id));
-        if (!walletdb.ReadPool(id, keypool))
+    std::set<int64_t> *setKeyPool = internal ? &setInternalKeyPool : &setExternalKeyPool;
-            throw std::runtime_error(std::string(__func__) + ": read failed");
+    auto it = setKeyPool->begin();
-        assert(keypool.vchPubKey.IsValid());
-        CKeyID keyID = keypool.vchPubKey.GetID();
-        setAddress.insert(keyID);
-    }
-}
-
-void CWallet::GetAllReserveKeys(std::set<CKeyID>& setAddress) const
-{
-    setAddress.clear();
 
     CWalletDB walletdb(*dbw);
+    while (it != std::end(*setKeyPool)) {
+        const int64_t& index = *(it);
+        if (index > keypool_id) break; // set*KeyPool is ordered
 
-    LOCK2(cs_main, cs_wallet);
+        CKeyPool keypool;
-    LoadReserveKeysToSet(setAddress, setInternalKeyPool, walletdb);
+        if (walletdb.ReadPool(index, keypool)) { //TODO: This should be unnecessary
-    LoadReserveKeysToSet(setAddress, setExternalKeyPool, walletdb);
+            m_pool_key_to_index.erase(keypool.vchPubKey.GetID());
-
+        }
-    for (const CKeyID& keyID : setAddress) {
+        walletdb.ErasePool(index);
-        if (!HaveKey(keyID)) {
+        it = setKeyPool->erase(it);
-            throw std::runtime_error(std::string(__func__) + ": unknown key in key pool");
     }
 }
+
+bool CWallet::HasUnusedKeys(int min_keys) const
+{
+    return setExternalKeyPool.size() >= min_keys && (setInternalKeyPool.size() >= min_keys || !CanSupportFeature(FEATURE_HD_SPLIT));
 }
 
 void CWallet::GetScriptForMining(std::shared_ptr<CReserveScript> &script)
@@ -4762,38 +4845,6 @@ void CWallet::ListProTxCoins(std::vector<COutPoint>& vOutpts)
 
 /** @} */ // end of Actions
 
-class CAffectedKeysVisitor : public boost::static_visitor<void> {
-private:
-    const CKeyStore &keystore;
-    std::vector<CKeyID> &vKeys;
-
-public:
-    CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}
-
-    void Process(const CScript &script) {
-        txnouttype type;
-        std::vector<CTxDestination> vDest;
-        int nRequired;
-        if (ExtractDestinations(script, type, vDest, nRequired)) {
-            for (const CTxDestination &dest : vDest)
-                boost::apply_visitor(*this, dest);
-        }
-    }
-
-    void operator()(const CKeyID &keyId) {
-        if (keystore.HaveKey(keyId))
-            vKeys.push_back(keyId);
-    }
-
-    void operator()(const CScriptID &scriptId) {
-        CScript script;
-        if (keystore.GetCScript(scriptId, script))
-            Process(script);
-    }
-
-    void operator()(const CNoDestination &none) {}
-};
-
 void CWallet::GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) const {
     AssertLockHeld(cs_wallet); // mapKeyMetadata
     mapKeyBirth.clear();
@@ -5150,6 +5201,9 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
 
     RegisterValidationInterface(walletInstance);
 
+    // Try to top up keypool. No-op if the wallet is locked.
+    walletInstance->TopUpKeyPool();
+
     CBlockIndex *pindexRescan = chainActive.Genesis();
     if (!gArgs.GetBoolArg("-rescan", false))
     {

src/wallet/wallet.h

@@ -754,6 +754,7 @@ private:
     std::set<int64_t> setInternalKeyPool;
     std::set<int64_t> setExternalKeyPool;
     int64_t m_max_keypool_index;
+    std::map<CKeyID, int64_t> m_pool_key_to_index;
 
     int64_t nTimeFirstKey;
 
@@ -800,22 +801,7 @@ public:
         }
     }
 
-    void LoadKeyPool(int64_t nIndex, const CKeyPool &keypool)
+    void LoadKeyPool(int64_t nIndex, const CKeyPool &keypool);
-    {
-        if (keypool.fInternal) {
-            setInternalKeyPool.insert(nIndex);
-        } else {
-            setExternalKeyPool.insert(nIndex);
-        }
-        m_max_keypool_index = std::max(m_max_keypool_index, nIndex);
-
-        // If no metadata exists yet, create a default with the pool key's
-        // creation time. Note that this may be overwritten by actually
-        // stored metadata for that key later, which is fine.
-        CKeyID keyid = keypool.vchPubKey.GetID();
-        if (mapKeyMetadata.count(keyid) == 0)
-            mapKeyMetadata[keyid] = CKeyMetadata(keypool.nTime);
-    }
 
     // Map from Key ID (for regular keys) or Script ID (for watch-only keys) to
     // key metadata.
@@ -889,7 +875,7 @@ public:
     const CWalletTx* GetWalletTx(const uint256& hash) const;
 
     //! check whether we are allowed to upgrade (or already support) to the named feature
-    bool CanSupportFeature(enum WalletFeature wf) { AssertLockHeld(cs_wallet); return nWalletMaxVersion >= wf; }
+    bool CanSupportFeature(enum WalletFeature wf) const { AssertLockHeld(cs_wallet); return nWalletMaxVersion >= wf; }
 
     /**
      * populate vCoins with vector of available COutputs.
@@ -1095,10 +1081,16 @@ public:
     bool TopUpKeyPool(unsigned int kpSize = 0);
     void ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool, bool fInternal);
     void KeepKey(int64_t nIndex);
-    void ReturnKey(int64_t nIndex, bool fInternal);
+    void ReturnKey(int64_t nIndex, bool fInternal, const CPubKey& pubkey);
     bool GetKeyFromPool(CPubKey &key, bool fInternal /*= false*/);
     int64_t GetOldestKeyPoolTime();
-    void GetAllReserveKeys(std::set<CKeyID>& setAddress) const;
+    /**
+     * Marks all keys in the keypool up to and including reserve_key as used.
+     */
+    void MarkReserveKeysAsUsed(int64_t keypool_id);
+    const std::map<CKeyID, int64_t>& GetAllReserveKeys() const { return m_pool_key_to_index; }
+    /** Does the wallet have at least min_keys in the keypool? */
+    bool HasUnusedKeys(int min_keys) const;
 
     std::set< std::set<CTxDestination> > GetAddressGroupings();
     std::map<CTxDestination, CAmount> GetAddressBalances();

test/functional/keypool-topup.py

@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 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 HD Wallet keypool restore function.
+
+Two nodes. Node1 is under test. Node0 is providing transactions and generating blocks.
+
+- Start node1, shutdown and backup wallet.
+- Generate 110 keys (enough to drain the keypool). Store key 90 (in the initial keypool) and key 110 (beyond the initial keypool). Send funds to key 90 and key 110.
+- Stop node1, clear the datadir, move wallet file back into the datadir and restart node1.
+- connect node1 to node0. Verify that they sync and node1 receives its funds."""
+import shutil
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+    connect_nodes_bi,
+    sync_blocks,
+)
+
+class KeypoolRestoreTest(BitcoinTestFramework):
+    def __init__(self):
+        super().__init__()
+        self.setup_clean_chain = True
+        self.num_nodes = 2
+        self.extra_args = [['-usehd=0'], ['-usehd=1', '-keypool=100', '-keypoolmin=20']]
+
+    def run_test(self):
+        self.tmpdir = self.options.tmpdir
+        self.nodes[0].generate(101)
+
+        self.log.info("Make backup of wallet")
+
+        self.stop_node(1)
+
+        shutil.copyfile(self.tmpdir + "/node1/regtest/wallet.dat", self.tmpdir + "/wallet.bak")
+        self.nodes[1] = self.start_node(1, self.tmpdir, self.extra_args[1])
+        connect_nodes_bi(self.nodes, 0, 1)
+
+        self.log.info("Generate keys for wallet")
+
+        for _ in range(90):
+            addr_oldpool = self.nodes[1].getnewaddress()
+        for _ in range(20):
+            addr_extpool = self.nodes[1].getnewaddress()
+
+        self.log.info("Send funds to wallet")
+
+        self.nodes[0].sendtoaddress(addr_oldpool, 10)
+        self.nodes[0].generate(1)
+        self.nodes[0].sendtoaddress(addr_extpool, 5)
+        self.nodes[0].generate(1)
+        sync_blocks(self.nodes)
+
+        self.log.info("Restart node with wallet backup")
+
+        self.stop_node(1)
+
+        shutil.copyfile(self.tmpdir + "/wallet.bak", self.tmpdir + "/node1/regtest/wallet.dat")
+
+        self.log.info("Verify keypool is restored and balance is correct")
+
+        self.nodes[1] = self.start_node(1, self.tmpdir, self.extra_args[1])
+        connect_nodes_bi(self.nodes, 0, 1)
+        self.sync_all()
+
+        assert_equal(self.nodes[1].getbalance(), 15)
+        assert_equal(self.nodes[1].listtransactions()[0]['category'], "receive")
+
+        # Check that we have marked all keys up to the used keypool key as used
+        assert_equal(self.nodes[1].validateaddress(self.nodes[1].getnewaddress())['hdkeypath'], "m/0'/0'/111'")
+
+if __name__ == '__main__':
+    KeypoolRestoreTest().main()

test/functional/test_runner.py

@@ -86,6 +86,7 @@ BASE_SCRIPTS= [
     'rawtransactions.py',
     'reindex.py',
     # vv Tests less than 30s vv
+    'keypool-topup.py',
     'zmq_test.py',
     'mempool_resurrect_test.py',
     'txn_doublespend.py --mineblock',

test/functional/wallet-hd.py

@@ -72,10 +72,12 @@ class WalletHDTest(BitcoinTestFramework):
 
         self.log.info("Restore backup ...")
         self.stop_node(1)
-        os.remove(self.options.tmpdir + "/node1/regtest/wallet.dat")
+        # we need to delete the complete regtest directory
+        # otherwise node1 would auto-recover all funds in flag the keypool keys as used
+        shutil.rmtree(tmpdir + "/node1/regtest/blocks")
+        shutil.rmtree(tmpdir + "/node1/regtest/chainstate")
         shutil.copyfile(tmpdir + "/hd.bak", tmpdir + "/node1/regtest/wallet.dat")
         self.nodes[1] = self.start_node(1, self.options.tmpdir, self.extra_args[1], stderr=sys.stdout)
-        #connect_nodes_bi(self.nodes, 0, 1)
 
         # Assert that derivation is deterministic
         hd_add_2 = None
@@ -85,11 +87,12 @@ class WalletHDTest(BitcoinTestFramework):
             assert_equal(hd_info_2["hdkeypath"], "m/44'/1'/0'/0/"+str(_+1))
             assert_equal(hd_info_2["hdchainid"], chainid)
         assert_equal(hd_add, hd_add_2)
+        connect_nodes_bi(self.nodes, 0, 1)
+        self.sync_all()
 
         # Needs rescan
         self.stop_node(1)
         self.nodes[1] = self.start_node(1, self.options.tmpdir, self.extra_args[1] + ['-rescan'], stderr=sys.stdout)
-        #connect_nodes_bi(self.nodes, 0, 1)
         assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
 
         # send a tx and make sure its using the internal chain for the changeoutput