test: cover fastprune with excessive block size

test/functional/feature_fastprune.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+# Copyright (c) 2023 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 fastprune mode."""
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal
+)
+from test_framework.blocktools import (
+    create_block,
+    create_coinbase,
+    add_witness_commitment
+)
+from test_framework.wallet import MiniWallet
+
+
+class FeatureFastpruneTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.extra_args = [["-fastprune"]]
+
+    def run_test(self):
+        self.log.info("ensure that large blocks don't crash or freeze in -fastprune")
+        wallet = MiniWallet(self.nodes[0])
+        tx = wallet.create_self_transfer()['tx']
+        annex = [0x50]
+        for _ in range(0x10000):
+            annex.append(0xff)
+        tx.wit.vtxinwit[0].scriptWitness.stack.append(bytes(annex))
+        tip = int(self.nodes[0].getbestblockhash(), 16)
+        time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time'] + 1
+        height = self.nodes[0].getblockcount() + 1
+        block = create_block(hashprev=tip, ntime=time, txlist=[tx], coinbase=create_coinbase(height=height))
+        add_witness_commitment(block)
+        block.solve()
+        self.nodes[0].submitblock(block.serialize().hex())
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
+
+
+if __name__ == '__main__':
+    FeatureFastpruneTest().main()

test/functional/test_runner.py

@@ -320,6 +320,7 @@
     'feature_includeconf.py',
     'feature_addrman.py',
     'feature_asmap.py',
+    'feature_fastprune.py',
     'mempool_unbroadcast.py',
     'mempool_compatibility.py',
     'mempool_accept_wtxid.py',