From d0044886ab1b41f30cd8ec9255411897f625ecac Mon Sep 17 00:00:00 2001
From: Amos Bird <amosbird@gmail.com>
Date: Tue, 1 Dec 2020 11:45:10 +0800
Subject: [PATCH] fix TSan

---
 src/Storages/System/StorageSystemStackTrace.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Storages/System/StorageSystemStackTrace.cpp b/src/Storages/System/StorageSystemStackTrace.cpp
index e822ac26744..a72fbeb2d5d 100644
--- a/src/Storages/System/StorageSystemStackTrace.cpp
+++ b/src/Storages/System/StorageSystemStackTrace.cpp
@@ -34,7 +34,7 @@ namespace ErrorCodes
 namespace
 {
     // Initialized in StorageSystemStackTrace's ctor and used in signalHandler.
-    pid_t expected_pid;
+    std::atomic<pid_t> expected_pid;
     const int sig = SIGRTMIN;
 
     std::atomic<int> sequence_num = 0;    /// For messages sent via pipe.