Fix race in TraceLog::AddEventWithTimestamp

base/trace_event/trace_log.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/trace_event/trace_log.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 #include <utility>
@@ skipping 1350 matching lines @@
     if ((flags & TRACE_EVENT_FLAG_FLOW_IN) ||
         (flags & TRACE_EVENT_FLAG_FLOW_OUT))
       bind_id = MangleEventId(bind_id);
     id = MangleEventId(id);
   }
 
   TimeTicks offset_event_timestamp = OffsetTimestamp(timestamp);
   ThreadTicks thread_now = ThreadNow();
 
   ThreadLocalEventBuffer* thread_local_event_buffer = nullptr;
-  if (enabled_modes_ & RECORDING_MODE) {
+  if (*category_group_enabled & RECORDING_MODE) {
     // |thread_local_event_buffer_| can be null if the current thread doesn't
     // have a message loop or the message loop is blocked.
     InitializeThreadLocalEventBufferIfSupported();
     thread_local_event_buffer = thread_local_event_buffer_.Get();
   }
 
   // Check and update the current thread name only if the event is for the
   // current thread to avoid locks in most cases.
   if (thread_id == static_cast<int>(PlatformThread::CurrentId())) {
     const char* new_name =
@@ skipping 546 matching lines @@
 }
 
 ScopedTraceBinaryEfficient::~ScopedTraceBinaryEfficient() {
   if (*category_group_enabled_) {
     TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(category_group_enabled_, name_,
                                                 event_handle_);
   }
 }
 
 }  // namespace trace_event_internal