From f34f119080b4e8baf396fb26c21d572dd432fd91 Mon Sep 17 00:00:00 2001
From: Tobias Hartmann <thartmann@openjdk.org>
Date: Fri, 19 Nov 2021 07:13:05 +0000
Subject: [PATCH] 8277213: CompileTask_lock is acquired out of order with
 MethodCompileQueue_lock

Reviewed-by: rbackman, coleenp
---
 src/hotspot/share/compiler/compileTask.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/hotspot/share/compiler/compileTask.hpp b/src/hotspot/share/compiler/compileTask.hpp
index 6281dea7a4a..23facc90cc5 100644
--- a/src/hotspot/share/compiler/compileTask.hpp
+++ b/src/hotspot/share/compiler/compileTask.hpp
@@ -104,7 +104,8 @@ class CompileTask : public CHeapObj<mtCompiler> {
 
  public:
   CompileTask() : _failure_reason(NULL), _failure_reason_on_C_heap(false) {
-    _lock = new Monitor(Mutex::safepoint, "CompileTask_lock");
+    // May hold MethodCompileQueue_lock
+    _lock = new Monitor(Mutex::safepoint-1, "CompileTask_lock");
   }
 
   void initialize(int compile_id, const methodHandle& method, int osr_bci, int comp_level,