From f92e007b08057223e9ce213a335d2eaac09cf6bc Mon Sep 17 00:00:00 2001
From: twerth <twerth@google.com>
Date: Tue, 20 Apr 2021 06:31:37 -0700
Subject: [PATCH] Synchronize access to time series.

PiperOrigin-RevId: 369426995
---
 .../com/google/devtools/build/lib/profiler/Profiler.java  | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/main/java/com/google/devtools/build/lib/profiler/Profiler.java b/src/main/java/com/google/devtools/build/lib/profiler/Profiler.java
index 1e332e870f270e..dea7c924f06e97 100644
--- a/src/main/java/com/google/devtools/build/lib/profiler/Profiler.java
+++ b/src/main/java/com/google/devtools/build/lib/profiler/Profiler.java
@@ -725,9 +725,11 @@ private void completeTask(TaskData data) {
 
       if (shouldRecordTask) {
         if (actionCountTimeSeries != null && countAction(data.type, data)) {
-          actionCountTimeSeries.addRange(
-              Duration.ofNanos(data.startTimeNanos).toMillis(),
-              Duration.ofNanos(endTime).toMillis());
+          synchronized (this) {
+            actionCountTimeSeries.addRange(
+                Duration.ofNanos(data.startTimeNanos).toMillis(),
+                Duration.ofNanos(endTime).toMillis());
+          }
         }
         SlowestTaskAggregator aggregator = slowestTasks[data.type.ordinal()];
         if (aggregator != null) {