From e8f1918b17d06bcbfc62309031a7311444154c97 Mon Sep 17 00:00:00 2001
From: root <root@Opensource.localdomain>
Date: Fri, 28 Feb 2025 18:43:06 +0800
Subject: [PATCH] resume one waiter at once

---
 compiler/rustc_query_system/src/query/job.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compiler/rustc_query_system/src/query/job.rs b/compiler/rustc_query_system/src/query/job.rs
index a8c2aa98cd083..3290227f9b145 100644
--- a/compiler/rustc_query_system/src/query/job.rs
+++ b/compiler/rustc_query_system/src/query/job.rs
@@ -488,6 +488,11 @@ pub fn break_query_cycles(query_map: QueryMap, registry: &rayon_core::Registry)
     while jobs.len() > 0 {
         if remove_cycle(&query_map, &mut jobs, &mut wakelist) {
             found_cycle = true;
+
+            // FIXME: Resume all the waiters at once may cause deadlocks,
+            // so we resume one waiter at a call for now.
+            // Remove this when we figure out the real reason.
+            break;
         }
     }