add comment (#19705)

2021-09-08 19:25:20 -05:00 · 2021-09-08 19:25:20 -05:00 · 1cf7ae51f8
commit 1cf7ae51f8
parent 4afd6dddc8
1 changed files with 1 additions and 1 deletions
--- a/runtime/src/rent_collector.rs
+++ b/runtime/src/rent_collector.rs
@ -54,7 +54,7 @@ impl RentCollector {

    // updates this account's lamports and status and returns
    //  the account rent collected, if any
-    //
+    // This is NOT thread safe at some level. If we try to collect from the same account in parallel, we may collect twice.
    #[must_use = "add to Bank::collected_rent"]
    pub fn collect_from_existing_account(
        &self,