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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 - Crash under WebCore::AudioSourceProviderAVFObjC::process()."
   href="https://bugs.webkit.org/show_bug.cgi?id=172101">172101</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Crash under WebCore::AudioSourceProviderAVFObjC::process().
          </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>WebCore Misc.
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>pvollan@apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>WebCore::AudioSourceProviderAVFObjC::process() is calling MTAudioProcessingTapGetSourceAudio() where the value of the parameter MTAudioProcessingTapRef is NULL.

Crashed Thread:        29  AUDeferredRenderer-0x7fe86d4e20

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000010
Exception Note:        EXC_CORPSE_NOTIFY

Thread 29 Crashed:: AUDeferredRenderer-0x7fe86d4e20
0   com.apple.MediaToolbox              0x7fffa8aabb53 MTAudioProcessingTapGetSourceAudio + 129 (/Library/Caches/com.apple.xbs/Sources/CoreMedia/CoreMedia-1873/Prototypes/MediaConverter/MTAudioProcessingTap.c:869)
1   com.apple.WebCore                   0x00007fffac05b580 WebCore::AudioSourceProviderAVFObjC::process(long, unsigned int, AudioBufferList*, long*, unsigned int*) + 64
2   com.apple.MediaToolbox              0x7fffa8aacaab aptap_AudioQueueProcessingTapCallback + 158 (/Library/Caches/com.apple.xbs/Sources/CoreMedia/CoreMedia-1873/Prototypes/MediaConverter/MTAudioProcessingTap.c:466)
3   com.apple.audio.toolbox.AudioToolbox        0x00007fffa450c97f AQClientCallProcessingTap(void*, unsigned int, AudioTimeStamp*, unsigned int*, unsigned int*, AudioBufferList*, int, double, unsigned int, double, unsigned int, unsigned char const*, unsigned int) + 93
4   com.apple.audio.toolbox.AudioToolbox        0x00007fffa45934b0 AQProcessingTap::DoCallout(unsigned int&, AudioTimeStamp&, unsigned int&, AudioBufferList&) + 188
5   com.apple.audio.toolbox.AudioToolbox        0x00007fffa45932af AudioQueueObject::PerformTapInternal(AudioTimeStamp&, unsigned int&, unsigned int&) + 133
6   com.apple.audio.toolbox.AudioToolbox        0x00007fffa45931b5 AudioQueueObject::PerformProcessingTap(int (*)(void*, unsigned int&, AudioTimeStamp const&, unsigned int, AudioBufferList&, double&, unsigned int&), void*, AudioTimeStamp&, unsigned int&, AudioBufferList&, unsigned int&) + 197
7   com.apple.audio.toolbox.AudioToolbox        0x00007fffa459ddd9 MEMixerChannel::TapDownstream(void*, unsigned int*, AudioTimeStamp const*, unsigned int, unsigned int, AudioBufferList*) + 129
8   com.apple.audio.units.Components    0x000000011a51c6b5 AUInputElement::PullInput(unsigned int&, AudioTimeStamp const&, unsigned int, unsigned int) + 185
9   com.apple.audio.units.Components    0x000000011a45f374 AUDeferredRenderer::Produce() + 576
10  com.apple.audio.units.Components    0x000000011a45f0ab AUDeferredRenderer::ProducerThreadProc() + 49
11  com.apple.audio.units.Components    0x000000011a45eaab AUDeferredRenderer::ProducerThreadProc(void*) + 31
12  com.apple.audio.units.Components    0x000000011a532737 CAPThread::Entry(CAPThread*) + 85
13  libsystem_pthread.dylib             0x00007fffb9accc4f _pthread_body + 176
14  libsystem_pthread.dylib             0x00007fffb9accb9f _pthread_start + 274
15  libsystem_pthread.dylib             0x00007fffb9acc3d5 thread_start + 13</pre>
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      </p>


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