Merge bitcoin#27228: test: exempt previous release binaries from valgrind

850670e test: don't run old binaries under valgrind (Sjors Provoost)

Pull request description:

  Some, but not all, backward compatibility tests fail for me and it seems useless to run old release binaries under valgrind anyway.

  Can be tested by running `test/functional/feature_txindex_compatibility.py --valgrind --timeout-factor=10` with and without this PR.

  —
  The previous version of this PR disabled these test entirely under valgrind. The current version does run the test, but starts the old binaries without valgrind.

ACKs for top commit:
  maflcko:
    lgtm ACK 850670e

Tree-SHA512: ebdf461083f1292528e6619963b910f486b60b4f6b183f0aea2c8bfcafa98caeb204d138700cd288450643bcec5e49e12b89f2f7537fccdf495a2a33acd9cea0

Author: fanquake

test/functional/test_framework/test_framework.py

@@ -185,7 +185,7 @@ def parse_args(self):
         parser.add_argument("--perf", dest="perf", default=False, action="store_true",
                             help="profile running nodes with perf for the duration of the test")
         parser.add_argument("--valgrind", dest="valgrind", default=False, action="store_true",
-                            help="run nodes under the valgrind memory error detector: expect at least a ~10x slowdown. valgrind 3.14 or later required.")
+                            help="run nodes under the valgrind memory error detector: expect at least a ~10x slowdown. valgrind 3.14 or later required. Does not apply to previous release binaries.")
         parser.add_argument("--randomseed", type=int,
                             help="set a random seed for deterministically reproducing a previous test run")
         parser.add_argument("--timeout-factor", dest="timeout_factor", type=float, help="adjust test timeouts by a factor. Setting it to 0 disables all timeouts")

test/functional/test_framework/test_node.py

@@ -110,7 +110,8 @@ def __init__(self, i, datadir_path, *, chain, rpchost, timewait, timeout_factor,
         if self.descriptors is None:
             self.args.append("-disablewallet")
 
-        if use_valgrind:
+        # Use valgrind, expect for previous release binaries
+        if use_valgrind and version is None:
             default_suppressions_file = Path(__file__).parents[3] / "contrib" / "valgrind.supp"
             suppressions_file = os.getenv("VALGRIND_SUPPRESSIONS_FILE",
                                           default_suppressions_file)