There really are some tests that are problematic.
diff --git a/Misc/build.sh b/Misc/build.sh
index a6ba927..5936dfd 100755
--- a/Misc/build.sh
+++ b/Misc/build.sh
@@ -67,7 +67,7 @@
# Note: test_XXX (none currently) really leak, but are disabled
# so we don't send spam. Any test which really leaks should only
# be listed here if there are also test cases under Lib/test/leakers.
-LEAKY_TESTS="test_(XXX)" # Currently no tests should report spurious leaks.
+LEAKY_TESTS="test_(cmd_line|socket)"
# Skip these tests altogether when looking for leaks. These tests
# do not need to be stored above in LEAKY_TESTS too.