diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
index 6f3faa3b0..38250250f 100644
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -1,85 +1,86 @@
 # Copyright (c) 2015-2016 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 bin_PROGRAMS += bench/bench_bitcoin
 BENCH_SRCDIR = bench
 BENCH_BINARY = bench/bench_bitcoin$(EXEEXT)
 
 RAW_BENCH_FILES = \
   bench/data/block413567.raw
 GENERATED_BENCH_FILES = $(RAW_BENCH_FILES:.raw=.raw.h)
 
 bench_bench_bitcoin_SOURCES = \
   $(RAW_BENCH_FILES) \
   bench/bench_bitcoin.cpp \
   bench/bench.cpp \
   bench/bench.h \
   bench/cashaddr.cpp \
   bench/checkblock.cpp \
   bench/checkqueue.cpp \
+  bench/duplicate_inputs.cpp \
   bench/examples.cpp \
   bench/rollingbloom.cpp \
   bench/crypto_aes.cpp \
   bench/crypto_hash.cpp \
   bench/ccoins_caching.cpp \
   bench/gcs_filter.cpp \
   bench/merkle_root.cpp \
   bench/mempool_eviction.cpp \
   bench/rpc_mempool.cpp \
   bench/base58.cpp \
   bench/lockedpool.cpp \
   bench/prevector.cpp
 
 nodist_bench_bench_bitcoin_SOURCES = $(GENERATED_BENCH_FILES)
 
 bench_bench_bitcoin_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(EVENT_CLFAGS) $(EVENT_PTHREADS_CFLAGS) -I$(builddir)/bench/
 bench_bench_bitcoin_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 bench_bench_bitcoin_LDADD = \
   $(LIBBITCOIN_WALLET) \
   $(LIBBITCOIN_SERVER) \
   $(LIBBITCOIN_COMMON) \
   $(LIBBITCOIN_UTIL) \
   $(LIBBITCOIN_CONSENSUS) \
   $(LIBBITCOIN_CRYPTO) \
   $(LIBLEVELDB) \
   $(LIBLEVELDB_SSE42) \
   $(LIBMEMENV) \
   $(LIBSECP256K1) \
   $(LIBUNIVALUE) \
   $(EVENT_PTHREADS_LIBS) \
   $(EVENT_LIBS)
 
 if ENABLE_ZMQ
 bench_bench_bitcoin_LDADD += $(LIBBITCOIN_ZMQ) $(ZMQ_LIBS)
 endif
 
 if ENABLE_WALLET
 bench_bench_bitcoin_SOURCES += bench/coin_selection.cpp
 endif
 
 bench_bench_bitcoin_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(SSL_LIBS) $(CRYPTO_LIBS) $(MINIUPNPC_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS)
 bench_bench_bitcoin_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 
 CLEAN_BITCOIN_BENCH = bench/*.gcda bench/*.gcno $(GENERATED_BENCH_FILES)
 
 CLEANFILES += $(CLEAN_BITCOIN_BENCH)
 
 bench/checkblock.cpp: bench/data/block413567.raw.h
 
 bitcoin_bench: $(BENCH_BINARY)
 
 bench: $(BENCH_BINARY) FORCE
 	$(BENCH_BINARY)
 
 bitcoin_bench_clean : FORCE
 	rm -f $(CLEAN_BITCOIN_BENCH) $(bench_bench_bitcoin_OBJECTS) $(BENCH_BINARY)
 
 %.raw.h: %.raw
 	@$(MKDIR_P) $(@D)
 	@{ \
 	 echo "static unsigned const char $(*F)[] = {" && \
 	 $(HEXDUMP) -v -e '8/1 "0x%02x, "' -e '"\n"' $< | $(SED) -e 's/0x  ,//g' && \
 	 echo "};"; \
 	} > "$@.new" && mv -f "$@.new" "$@"
 	@echo "Generated $@"
diff --git a/src/bench/CMakeLists.txt b/src/bench/CMakeLists.txt
index 71dcce646..6e0079382 100644
--- a/src/bench/CMakeLists.txt
+++ b/src/bench/CMakeLists.txt
@@ -1,71 +1,72 @@
 # Copyright (c) 2018 The Bitcoin developers
 
 project(bitcoin-bench)
 
 set(BENCH_DATA_RAW_FILES
 	data/block413567.raw
 )
 
 # Process raw files.
 file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/data")
 
 foreach(_raw_file ${BENCH_DATA_RAW_FILES})
 	string(APPEND
 		_generated_header_output
 		"${CMAKE_CURRENT_BINARY_DIR}/${_raw_file}" ".h"
 	)
 
 	list(APPEND BENCH_DATA_GENERATED_HEADERS ${_generated_header_output})
 	get_filename_component(_test_name ${_raw_file} NAME_WE)
 
 	add_custom_command(
 		OUTPUT "${_generated_header_output}"
 		COMMAND 
 			"${PYTHON_EXECUTABLE}"
 			"data/convert-raw-to-header.py"
 			"${_test_name}"
 			"${_raw_file}" > "${_generated_header_output}"
 		COMMENT "Transforming raw file ${_raw_file} into header"
 		MAIN_DEPEDENCY "${_raw_file}"
 		DEPENDS "data/convert-raw-to-header.py"
 		VERBATIM
 		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
 	)
 endforeach()
 
 add_executable(bitcoin-bench
 	EXCLUDE_FROM_ALL
 	base58.cpp
 	bench.cpp
 	bench_bitcoin.cpp
 	cashaddr.cpp
 	ccoins_caching.cpp
 	checkblock.cpp
 	checkqueue.cpp
 	crypto_aes.cpp
 	crypto_hash.cpp
+	duplicate_inputs.cpp
 	examples.cpp
 	gcs_filter.cpp
 	lockedpool.cpp
 	mempool_eviction.cpp
 	merkle_root.cpp
 	prevector.cpp
 	rollingbloom.cpp
 	rpc_mempool.cpp
 
 	# Add the generated headers to trigger the conversion command
 	${BENCH_DATA_GENERATED_HEADERS}
 )
 
 target_link_libraries(bitcoin-bench common bitcoinconsensus wallet server)
 
 if(BUILD_BITCOIN_WALLET)
 	target_sources(bitcoin-bench PRIVATE coin_selection.cpp)
 endif()
 
 add_custom_target(bench-bitcoin
 	COMMAND
 		./bitcoin-bench
 	DEPENDS
 		bitcoin-bench
 )
diff --git a/src/bench/duplicate_inputs.cpp b/src/bench/duplicate_inputs.cpp
new file mode 100644
index 000000000..a0f8aa282
--- /dev/null
+++ b/src/bench/duplicate_inputs.cpp
@@ -0,0 +1,105 @@
+// Copyright (c) 2011-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <bench/bench.h>
+#include <chain.h>
+#include <chainparams.h>
+#include <coins.h>
+#include <config.h>
+#include <consensus/merkle.h>
+#include <consensus/validation.h>
+#include <miner.h>
+#include <policy/policy.h>
+#include <pow.h>
+#include <scheduler.h>
+#include <script/scriptcache.h>
+#include <txdb.h>
+#include <txmempool.h>
+#include <util/time.h>
+#include <validation.h>
+#include <validationinterface.h>
+
+#include <boost/thread.hpp>
+
+#include <list>
+#include <vector>
+
+static void DuplicateInputs(benchmark::State &state) {
+    const CScript SCRIPT_PUB{CScript(OP_TRUE)};
+
+    // Switch to regtest so we can mine faster
+    SelectParams(CBaseChainParams::REGTEST);
+    const Config &config = GetConfig();
+
+    InitScriptExecutionCache();
+
+    boost::thread_group thread_group;
+    CScheduler scheduler;
+    const CChainParams &chainparams = config.GetChainParams();
+    {
+        ::pblocktree.reset(new CBlockTreeDB(1 << 20, true));
+        ::pcoinsdbview.reset(new CCoinsViewDB(1 << 23, true));
+        ::pcoinsTip.reset(new CCoinsViewCache(pcoinsdbview.get()));
+
+        thread_group.create_thread(
+            std::bind(&CScheduler::serviceQueue, &scheduler));
+        GetMainSignals().RegisterBackgroundSignalScheduler(scheduler);
+        LoadGenesisBlock(chainparams);
+        CValidationState cvstate;
+        ActivateBestChain(config, cvstate);
+        assert(::chainActive.Tip() != nullptr);
+    }
+
+    CBlock block{};
+    CMutableTransaction coinbaseTx{};
+    CMutableTransaction naughtyTx{};
+
+    CBlockIndex *pindexPrev = ::chainActive.Tip();
+    assert(pindexPrev != nullptr);
+    block.nBits =
+        GetNextWorkRequired(pindexPrev, &block, chainparams.GetConsensus());
+    block.nNonce = 0;
+    auto nHeight = pindexPrev->nHeight + 1;
+
+    // Make a coinbase TX
+    coinbaseTx.vin.resize(1);
+    coinbaseTx.vin[0].prevout = COutPoint();
+    coinbaseTx.vout.resize(1);
+    coinbaseTx.vout[0].scriptPubKey = SCRIPT_PUB;
+    coinbaseTx.vout[0].nValue =
+        GetBlockSubsidy(nHeight, chainparams.GetConsensus());
+    coinbaseTx.vin[0].scriptSig = CScript() << nHeight << OP_0;
+
+    naughtyTx.vout.resize(1);
+    naughtyTx.vout[0].nValue = Amount::zero();
+    naughtyTx.vout[0].scriptPubKey = SCRIPT_PUB;
+
+    uint64_t n_inputs =
+        ((MAX_TX_SIZE - CTransaction(naughtyTx).GetTotalSize()) / 41) - 100;
+    for (uint64_t x = 0; x < (n_inputs - 1); ++x) {
+        naughtyTx.vin.emplace_back(TxId(GetRandHash()), 0, CScript(), 0);
+    }
+    naughtyTx.vin.emplace_back(naughtyTx.vin.back());
+
+    block.vtx.push_back(MakeTransactionRef(std::move(coinbaseTx)));
+    block.vtx.push_back(MakeTransactionRef(std::move(naughtyTx)));
+
+    block.hashMerkleRoot = BlockMerkleRoot(block);
+
+    while (state.KeepRunning()) {
+        CValidationState cvstate{};
+        assert(!CheckBlock(block, cvstate, chainparams.GetConsensus(),
+                           BlockValidationOptions(config)
+                               .withCheckPoW(false)
+                               .withCheckMerkleRoot(false)));
+        assert(cvstate.GetRejectReason() == "bad-txns-inputs-duplicate");
+    }
+
+    thread_group.interrupt_all();
+    thread_group.join_all();
+    GetMainSignals().FlushBackgroundCallbacks();
+    GetMainSignals().UnregisterBackgroundSignalScheduler();
+}
+
+BENCHMARK(DuplicateInputs, 10);