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      <base href="https://bugs.webkit.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ASSERTION FAILED: numberOfChannels == 2 in WebCore::RealtimeIncomingAudioSource::OnData"
   href="https://bugs.webkit.org/show_bug.cgi?id=169224">169224</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ASSERTION FAILED: numberOfChannels == 2 in WebCore::RealtimeIncomingAudioSource::OnData
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ryanhaddad&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>ASSERTION FAILED: numberOfChannels == 2
/Volumes/Data/slave/sierra-debug/build/Source/WebCore/platform/mediastream/mac/RealtimeIncomingAudioSource.cpp(84) : virtual void WebCore::RealtimeIncomingAudioSource::OnData(const void *, int, int, size_t, size_t)
1   0x107693b8d WTFCrash
2   0x10cf2a9c5 WebCore::RealtimeIncomingAudioSource::OnData(void const*, int, int, unsigned long, unsigned long)
3   0x10cf2adab non-virtual thunk to WebCore::RealtimeIncomingAudioSource::OnData(void const*, int, int, unsigned long, unsigned long)
4   0x1049a2bba webrtc::RemoteAudioSource::OnData(webrtc::AudioSinkInterface::Data const&amp;)
5   0x1049a361a webrtc::RemoteAudioSource::Sink::OnData(webrtc::AudioSinkInterface::Data const&amp;)
6   0x104338fcc webrtc::voe::Channel::GetAudioFrameWithMuted(int, webrtc::AudioFrame*)
7   0x104339b9d webrtc::voe::Channel::GetAudioFrameWithInfo(int, webrtc::AudioFrame*)
8   0x1043549ec webrtc::voe::ChannelProxy::GetAudioFrameWithInfo(int, webrtc::AudioFrame*)
9   0x10428ae7a webrtc::internal::AudioReceiveStream::GetAudioFrameWithInfo(int, webrtc::AudioFrame*)
10  0x10428aeb2 non-virtual thunk to webrtc::internal::AudioReceiveStream::GetAudioFrameWithInfo(int, webrtc::AudioFrame*)
11  0x1041eb053 webrtc::AudioMixerImpl::GetAudioFromSources()
12  0x1041ea2f6 webrtc::AudioMixerImpl::Mix(unsigned long, webrtc::AudioFrame*)
13  0x1045f3539 webrtc::AudioTransportProxy::PullRenderData(int, int, unsigned long, unsigned long, void*, long long*, long long*)
14  0x10cad35ac WebCore::LibWebRTCAudioModule::PollFromSource()
15  0x10cad32f7 WebCore::LibWebRTCAudioModule::StartPlayoutOnAudioThread()
16  0x10cad32c8 WebCore::LibWebRTCAudioModule::OnMessage(rtc::Message*)
17  0x10cad339c non-virtual thunk to WebCore::LibWebRTCAudioModule::OnMessage(rtc::Message*)
18  0x104515f16 rtc::MessageQueue::Dispatch(rtc::Message*)
19  0x10492e20d rtc::Thread::ProcessMessages(int)
20  0x10492e12a rtc::Thread::Run()
21  0x10492de4e rtc::Thread::PreRun(void*)
22  0x7fffd5f67aab _pthread_body
23  0x7fffd5f679f7 _pthread_body
24  0x7fffd5f671fd thread_start

Seen with LayoutTest webrtc/audio-peer-connection-webaudio.html    

<a href="https://build.webkit.org/results/Apple%20Sierra%20Debug%20WK2%20(Tests)/r213458%20(2455)/results.html">https://build.webkit.org/results/Apple%20Sierra%20Debug%20WK2%20(Tests)/r213458%20(2455)/results.html</a></pre>
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