There is a racing between SyncSocket::Receive in audio_thread_ and SyncSocket::Close in renderer ...

content/renderer/media/webrtc_audio_device_impl.cc

 // Copyright (c) 2011 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 "content/renderer/media/webrtc_audio_device_impl.h"
 
 #include "base/bind.h"
 #include "base/string_util.h"
 #include "base/win/windows_version.h"
 #include "content/renderer/media/audio_hardware.h"
@@ skipping 579 matching lines @@
   return 0;
 }
 
 int32_t WebRtcAudioDeviceImpl::StopPlayout() {
   DVLOG(1) << "StopPlayout()";
   DCHECK(audio_output_device_);
   if (!playing_) {
     // webrtc::VoiceEngine assumes that it is OK to call Stop() just in case.
     return 0;
   }
-  playing_ = !audio_output_device_->Stop();
-  return (!playing_ ? 0 : -1);
+  audio_output_device_->Stop();
+  playing_ = false;
+  return 0;
 }
 
 bool WebRtcAudioDeviceImpl::Playing() const {
   return playing_;
 }
 
 int32_t WebRtcAudioDeviceImpl::StartRecording() {
   DVLOG(1) << "StartRecording()";
 #if defined(OS_MACOSX)
   DLOG(WARNING) << "Real-time recording is not yet fully supported on Mac OS X";
@@ skipping 27 matching lines @@
 
 int32_t WebRtcAudioDeviceImpl::StopRecording() {
   DVLOG(1) << "StopRecording()";
   DCHECK(audio_input_device_);
 
   base::AutoLock auto_lock(lock_);
   if (!recording_) {
     // webrtc::VoiceEngine assumes that it is OK to call Stop() just in case.
     return 0;
   }
-  recording_ = !audio_input_device_->Stop();
-  return (!recording_ ? 0 : -1);
+  audio_input_device_->Stop();
+  recording_ = false;
+  return 0;
 }
 
 bool WebRtcAudioDeviceImpl::Recording() const {
   return recording_;
 }
 
 int32_t WebRtcAudioDeviceImpl::SetAGC(bool enable) {
   DVLOG(2) << "WARNING: WebRtcAudioDeviceImpl::SetAGC() " << "NOT IMPLEMENTED";
   return -1;
 }
@@ skipping 303 matching lines @@
 }
 
 int32_t WebRtcAudioDeviceImpl::GetLoudspeakerStatus(bool* enabled) const {
   NOTIMPLEMENTED();
   return -1;
 }
 
 void WebRtcAudioDeviceImpl::SetSessionId(int session_id) {
   session_id_ = session_id;
 }