EXPERIMENT: apacheGH-44071: [C++] Leak S3 structures if finalization happens too late

Author: pitrou

cpp/src/arrow/filesystem/s3fs.cc

@@ -3389,6 +3389,9 @@ struct AwsInstance {
         ARROW_LOG(WARNING)
             << " arrow::fs::FinalizeS3 was not called even though S3 was initialized.  "
                "This could lead to a segmentation fault at exit";
+        auto leaked_ptr = new std::shared_ptr<S3ClientFinalizer>(GetClientFinalizer());
+        ARROW_UNUSED(leaked_ptr);
+        return;
       }
       GetClientFinalizer()->Finalize();
 #ifdef ARROW_S3_HAS_S3CLIENT_CONFIGURATION