diff --git a/runtime/src/bank_forks.rs b/runtime/src/bank_forks.rs
index dc8e31e14a281d..7ec4e8b3bb03e0 100644
--- a/runtime/src/bank_forks.rs
+++ b/runtime/src/bank_forks.rs
@@ -727,12 +727,27 @@ mod tests {
         solana_vote_program::vote_state::BlockTimestamp,
     };
 
+    // This test verifies that BankForks::new_rw_arc() doesn't create a reference cycle.
+    //
+    // Before PR #1893, there was a cycle:
+    //   Arc<RwLock<BankForks>> → Bank → ProgramCache → Arc<RwLock<BankForks>>
+    //
+    // This happened because new_rw_arc() called:
+    //   root_bank.set_fork_graph_in_program_cache(bank_forks.clone())
+    //
+    // The fix changed it to use a Weak reference:
+    //   root_bank.set_fork_graph_in_program_cache(Arc::downgrade(&bank_forks))
+    //
+    // Breaking the cycle:
+    //   Arc<RwLock<BankForks>> → Bank → ProgramCache → Weak<RwLock<BankForks>>
+    //
+    // Without the fix: strong_count == 2 (the clone creates an extra strong ref)
+    // With the fix: strong_count == 1 (only the returned Arc holds a strong ref)
     #[test]
     fn test_bank_forks_new_rw_arc_memory_leak() {
-        for _ in 0..1000 {
-            let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
-            BankForks::new_rw_arc(Bank::new_for_tests(&genesis_config));
-        }
+        let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
+        let bank_forks = BankForks::new_rw_arc(Bank::new_for_tests(&genesis_config));
+        assert_eq!(Arc::strong_count(&bank_forks), 1);
     }
 
     #[test]