From b908680bec6981ff7d9c394ec625671400c7ce6c Mon Sep 17 00:00:00 2001
From: Jiaming Yuan <jm.yuan@outlook.com>
Date: Fri, 21 Apr 2023 05:24:10 +0800
Subject: [PATCH] Fix race condition in cpp metric tests. (#9058)

---
 src/metric/elementwise_metric.cu | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/metric/elementwise_metric.cu b/src/metric/elementwise_metric.cu
index b1c76404715a..01aec16e10c8 100644
--- a/src/metric/elementwise_metric.cu
+++ b/src/metric/elementwise_metric.cu
@@ -217,7 +217,7 @@ struct EvalError {
     }
   }
   const char *Name() const {
-    static std::string name;
+    static thread_local std::string name;
     if (has_param_) {
       std::ostringstream os;
       os << "error";
@@ -315,7 +315,7 @@ struct EvalTweedieNLogLik {
         << "tweedie variance power must be in interval [1, 2)";
   }
   const char *Name() const {
-    static std::string name;
+    static thread_local std::string name;
     std::ostringstream os;
     os << "tweedie-nloglik@" << rho_;
     name = os.str();