5 files changed, 53 insertions, 8 deletions
diff --git a/src/test/fuzz/policy_estimator.cpp b/src/test/fuzz/policy_estimator.cpp
index e4d95f72a0..58c19a91cb 100644
--- a/src/test/fuzz/policy_estimator.cpp
+++ b/src/test/fuzz/policy_estimator.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <policy/fees.h>
+#include <policy/fees_args.h>
 #include <primitives/transaction.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
@@ -15,15 +16,20 @@
 #include <string>
 #include <vector>
 
+namespace {
+const BasicTestingSetup* g_setup;
+} // namespace
+
 void initialize_policy_estimator()
 {
     static const auto testing_setup = MakeNoLogFileContext<>();
+    g_setup = testing_setup.get();
 }
 
 FUZZ_TARGET_INIT(policy_estimator, initialize_policy_estimator)
 {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
-    CBlockPolicyEstimator block_policy_estimator;
+    CBlockPolicyEstimator block_policy_estimator{FeeestPath(*g_setup->m_node.args)};
     LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
         CallOneOf(
             fuzzed_data_provider,
diff --git a/src/test/fuzz/policy_estimator_io.cpp b/src/test/fuzz/policy_estimator_io.cpp
index 9021d95954..77402c260a 100644
--- a/src/test/fuzz/policy_estimator_io.cpp
+++ b/src/test/fuzz/policy_estimator_io.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <policy/fees.h>
+#include <policy/fees_args.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <test/fuzz/util.h>
@@ -11,9 +12,14 @@
 #include <cstdint>
 #include <vector>
 
+namespace {
+const BasicTestingSetup* g_setup;
+} // namespace
+
 void initialize_policy_estimator_io()
 {
     static const auto testing_setup = MakeNoLogFileContext<>();
+    g_setup = testing_setup.get();
 }
 
 FUZZ_TARGET_INIT(policy_estimator_io, initialize_policy_estimator_io)
@@ -22,7 +28,7 @@ FUZZ_TARGET_INIT(policy_estimator_io, initialize_policy_estimator_io)
     FuzzedAutoFileProvider fuzzed_auto_file_provider = ConsumeAutoFile(fuzzed_data_provider);
     CAutoFile fuzzed_auto_file = fuzzed_auto_file_provider.open();
     // Re-using block_policy_estimator across runs to avoid costly creation of CBlockPolicyEstimator object.
-    static CBlockPolicyEstimator block_policy_estimator;
+    static CBlockPolicyEstimator block_policy_estimator{FeeestPath(*g_setup->m_node.args)};
     if (block_policy_estimator.Read(fuzzed_auto_file)) {
         block_policy_estimator.Write(fuzzed_auto_file);
     }
diff --git a/src/test/fuzz/rbf.cpp b/src/test/fuzz/rbf.cpp
index 8dcaa609b5..4801635791 100644
--- a/src/test/fuzz/rbf.cpp
+++ b/src/test/fuzz/rbf.cpp
@@ -2,12 +2,14 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <mempool_args.h>
 #include <policy/rbf.h>
 #include <primitives/transaction.h>
 #include <sync.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <test/fuzz/util.h>
+#include <test/util/setup_common.h>
 #include <txmempool.h>
 
 #include <cstdint>
@@ -15,7 +17,17 @@
 #include <string>
 #include <vector>
 
-FUZZ_TARGET(rbf)
+namespace {
+const BasicTestingSetup* g_setup;
+} // namespace
+
+void initialize_rbf()
+{
+    static const auto testing_setup = MakeNoLogFileContext<>();
+    g_setup = testing_setup.get();
+}
+
+FUZZ_TARGET_INIT(rbf, initialize_rbf)
 {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
     SetMockTime(ConsumeTime(fuzzed_data_provider));
@@ -23,8 +35,11 @@ FUZZ_TARGET(rbf)
     if (!mtx) {
         return;
     }
-    CTxMemPool pool;
-    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
+
+    CTxMemPool pool{MemPoolOptionsForTest(g_setup->m_node)};
+
+    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000)
+    {
         const std::optional<CMutableTransaction> another_mtx = ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider);
         if (!another_mtx) {
             break;
diff --git a/src/test/fuzz/tx_pool.cpp b/src/test/fuzz/tx_pool.cpp
index 4f40608c4f..2d88ee295b 100644
--- a/src/test/fuzz/tx_pool.cpp
+++ b/src/test/fuzz/tx_pool.cpp
@@ -3,6 +3,8 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <consensus/validation.h>
+#include <mempool_args.h>
+#include <node/context.h>
 #include <node/miner.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
@@ -15,6 +17,7 @@
 #include <validationinterface.h>
 
 using node::BlockAssembler;
+using node::NodeContext;
 
 namespace {
 
@@ -121,6 +124,19 @@ void MockTime(FuzzedDataProvider& fuzzed_data_provider, const CChainState& chain
     SetMockTime(time);
 }
 
+CTxMemPool MakeMempool(const NodeContext& node)
+{
+    // Take the default options for tests...
+    CTxMemPool::Options mempool_opts{MemPoolOptionsForTest(node)};
+
+    // ...override specific options for this specific fuzz suite
+    mempool_opts.estimator = nullptr;
+    mempool_opts.check_ratio = 1;
+
+    // ...and construct a CTxMemPool from it
+    return CTxMemPool{mempool_opts};
+}
+
 FUZZ_TARGET_INIT(tx_pool_standard, initialize_tx_pool)
 {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
@@ -142,7 +158,7 @@ FUZZ_TARGET_INIT(tx_pool_standard, initialize_tx_pool)
     // The sum of the values of all spendable outpoints
     constexpr CAmount SUPPLY_TOTAL{COINBASE_MATURITY * 50 * COIN};
 
-    CTxMemPool tx_pool_{/*estimator=*/nullptr, /*check_ratio=*/1};
+    CTxMemPool tx_pool_{MakeMempool(node)};
     MockedTxPool& tx_pool = *static_cast<MockedTxPool*>(&tx_pool_);
 
     chainstate.SetMempool(&tx_pool);
@@ -320,7 +336,7 @@ FUZZ_TARGET_INIT(tx_pool, initialize_tx_pool)
         txids.push_back(ConsumeUInt256(fuzzed_data_provider));
     }
 
-    CTxMemPool tx_pool_{/*estimator=*/nullptr, /*check_ratio=*/1};
+    CTxMemPool tx_pool_{MakeMempool(node)};
     MockedTxPool& tx_pool = *static_cast<MockedTxPool*>(&tx_pool_);
 
     LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 300)
diff --git a/src/test/fuzz/validation_load_mempool.cpp b/src/test/fuzz/validation_load_mempool.cpp
index c2aaf486c5..9532610f8d 100644
--- a/src/test/fuzz/validation_load_mempool.cpp
+++ b/src/test/fuzz/validation_load_mempool.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <chainparamsbase.h>
+#include <mempool_args.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <test/fuzz/util.h>
@@ -30,7 +31,8 @@ FUZZ_TARGET_INIT(validation_load_mempool, initialize_validation_load_mempool)
     SetMockTime(ConsumeTime(fuzzed_data_provider));
     FuzzedFileProvider fuzzed_file_provider = ConsumeFile(fuzzed_data_provider);
 
-    CTxMemPool pool{};
+    CTxMemPool pool{MemPoolOptionsForTest(g_setup->m_node)};
+
     auto fuzzed_fopen = [&](const fs::path&, const char*) {
         return fuzzed_file_provider.open();
     };