test: Run fuzz tests on macOS

Also, fix a few bugs:

* Error: RPC command "enumeratesigners" not found in RPC_COMMANDS_SAFE_FOR_FUZZING or RPC_COMMANDS_NOT_SAFE_FOR_FUZZING. Please update test/fuzz/rpc.cpp.
* in run_once: ...format(" ".join(result.args), ... TypeError: sequence item 2: expected str instance, PosixPath found

ci/test/00_setup_env_mac_native_arm64.sh

@@ -14,3 +14,5 @@ export CI_OS_NAME="macos"
 export NO_DEPENDS=1
 export OSX_SDK=""
 export CCACHE_SIZE=300M
+export RUN_FUZZ_TESTS=true
+export FUZZ_TESTS_CONFIG="--exclude banman"  # https://github.com/bitcoin/bitcoin/issues/27924

src/test/fuzz/rpc.cpp

@@ -73,6 +73,7 @@ const std::vector<std::string> RPC_COMMANDS_NOT_SAFE_FOR_FUZZING{
     "addpeeraddress", // avoid DNS lookups
     "dumptxoutset",   // avoid writing to disk
     "dumpwallet", // avoid writing to disk
+    "enumeratesigners",
     "echoipc",              // avoid assertion failure (Assertion `"EnsureAnyNodeContext(request.context).init" && check' failed.)
     "generatetoaddress",    // avoid prohibitively slow execution (when `num_blocks` is large)
     "generatetodescriptor", // avoid prohibitively slow execution (when `nblocks` is large)

test/config.ini.in

@@ -22,7 +22,7 @@ RPCAUTH=@abs_top_srcdir@/share/rpcauth/rpcauth.py
 @BUILD_BITCOIN_UTIL_TRUE@ENABLE_BITCOIN_UTIL=true
 @BUILD_BITCOIN_WALLET_TRUE@ENABLE_WALLET_TOOL=true
 @BUILD_BITCOIND_TRUE@ENABLE_BITCOIND=true
-@ENABLE_FUZZ_TRUE@ENABLE_FUZZ=true
+@ENABLE_FUZZ_BINARY_TRUE@ENABLE_FUZZ_BINARY=true
 @ENABLE_ZMQ_TRUE@ENABLE_ZMQ=true
 @ENABLE_EXTERNAL_SIGNER_TRUE@ENABLE_EXTERNAL_SIGNER=true
 @ENABLE_SYSCALL_SANDBOX_TRUE@ENABLE_SYSCALL_SANDBOX=true

test/fuzz/test_runner.py

@@ -95,8 +95,8 @@ def main():
     configfile = os.path.abspath(os.path.dirname(__file__)) + "/../config.ini"
     config.read_file(open(configfile, encoding="utf8"))
 
-    if not config["components"].getboolean("ENABLE_FUZZ"):
-        logging.error("Must have fuzz targets built")
+    if not config["components"].getboolean("ENABLE_FUZZ_BINARY"):
+        logging.error("Must have fuzz executable built")
         sys.exit(1)
 
     # Build list of tests
@@ -148,11 +148,12 @@ def main():
             ],
             env=get_fuzz_env(target=test_list_selection[0], source_dir=config['environment']['SRCDIR']),
             timeout=20,
-            check=True,
+            check=False,
             stderr=subprocess.PIPE,
             text=True,
         ).stderr
-        if "libFuzzer" not in help_output:
+        using_libfuzzer = "libFuzzer" in help_output
+        if (args.generate or args.m_dir) and not using_libfuzzer:
             logging.error("Must be built with libFuzzer")
             sys.exit(1)
     except subprocess.TimeoutExpired:
@@ -186,6 +187,7 @@ def main():
             test_list=test_list_selection,
             src_dir=config['environment']['SRCDIR'],
             build_dir=config["environment"]["BUILDDIR"],
+            using_libfuzzer=using_libfuzzer,
             use_valgrind=args.valgrind,
             empty_min_time=args.empty_min_time,
         )
@@ -259,7 +261,7 @@ def merge_inputs(*, fuzz_pool, corpus, test_list, src_dir, build_dir, merge_dir)
         future.result()
 
 
-def run_once(*, fuzz_pool, corpus, test_list, src_dir, build_dir, use_valgrind, empty_min_time):
+def run_once(*, fuzz_pool, corpus, test_list, src_dir, build_dir, using_libfuzzer, use_valgrind, empty_min_time):
     jobs = []
     for t in test_list:
         corpus_path = corpus / t
@@ -268,13 +270,16 @@ def run_once(*, fuzz_pool, corpus, test_list, src_dir, build_dir, use_valgrind,
             os.path.join(build_dir, 'src', 'test', 'fuzz', 'fuzz'),
         ]
         empty_dir = not any(corpus_path.iterdir())
-        if empty_min_time and empty_dir:
-            args += [f"-max_total_time={empty_min_time}"]
+        if using_libfuzzer:
+            if empty_min_time and empty_dir:
+                args += [f"-max_total_time={empty_min_time}"]
+            else:
+                args += [
+                    "-runs=1",
+                    corpus_path,
+                ]
         else:
-            args += [
-                "-runs=1",
-                corpus_path,
-            ]
+            args += [corpus_path]
         if use_valgrind:
             args = ['valgrind', '--quiet', '--error-exitcode=1'] + args
 
@@ -301,7 +306,7 @@ def run_once(*, fuzz_pool, corpus, test_list, src_dir, build_dir, use_valgrind,
                 logging.info(e.stdout)
             if e.stderr:
                 logging.info(e.stderr)
-            logging.info("Target \"{}\" failed with exit code {}".format(" ".join(result.args), e.returncode))
+            logging.info(f"Target {result.args} failed with exit code {e.returncode}")
             sys.exit(1)