From af047d9c10be73ca9f450b2e3aa2c5c62483981c Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Tue, 5 Apr 2016 14:00:17 +0100
Subject: [PATCH] Fix infinite loop in Arc::downgrade

---
 src/liballoc/arc.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 055029dddcd..e1f698cb484 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -263,6 +263,7 @@ impl<T: ?Sized> Arc<T> {
         loop {
             // check if the weak counter is currently "locked"; if so, spin.
             if cur == usize::MAX {
+                cur = this.inner().weak.load(Relaxed);
                 continue;
             }