I&#39;m working with `AUGraph` and Audio Units API to playback and record audio in my iOS app. Now I have a rare issue when an `AUGraph` is unable to start with the following error:

&gt; result = kAUGraphErr_CannotDoInCurrentContext (-10863)

The error occurred unpredictably when we try to call `AUGraphStart` which is set up for audio playback:

    (BOOL)startRendering
    {
        if (playing) {
            return YES;
        }
        
        playing = YES;
        
        if (NO == [self setupAudioForGraph:&amp;au_play_graph playout:YES]) {
            print_error(&quot;Failed to create play AUGraph&quot;,0);
            playing = NO;
            return NO;
        }
        
        //result = kAUGraphErr_CannotDoInCurrentContext (-10863)
        OSStatus result = AUGraphStart(au_play_graph);
        if (noErr != result) {
            print_error(&quot;AUGraphStart&quot;, result);
            playing = NO;
        }
    
        return playing;
    }

Here what we get from the documentation:

&gt; To avoid spinning or waiting in the render thread (a bad idea!), many
&gt; of the calls to AUGraph can return:
&gt; kAUGraphErr_CannotDoInCurrentContext. This result is only generated
&gt; when you call an AUGraph API from its render callback. **It means that
&gt; the lock that it required was held at that time, by another thread**. If
&gt; you see this result code, you can generally attempt the action again -
&gt; typically the NEXT render cycle (so in the meantime the lock can be
&gt; cleared), or you can delegate that call to another thread in your app.
&gt; You should not spin or put-to-sleep the render thread.
&gt; 
&gt; 
&gt; This result code is only a transitory state, which will pass as soon
&gt; as your other thread&#39;s call to AUGraph (that has the lock) completes.

In my case, I just start the `AUGraph`, it&#39;s new and just created.
How can I debug the case and what could be the potential issue here?

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Receiving kAUGraphErr_CannotDoInCurrentContext when calling AUGraphStart for playback