diagnosing unexpected sched_stat_wait

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Hello,

My application is doing realtime low-latency audio, and we're seeing
occasional dropouts, which we've traced (via ftrace) to an unexplained
sched_stat_wait event on our audio-handling user thread.

We're really not sure what might be causing this, but if I could get
the user stack trace causing this event, it would let me see exactly
the problem.  Even the top frame of the stack would be invaluable.

Is there a way to get this info?  Preferrably with ftrace, but any
methods or hints would be much appreciated.

Thanks!
Jonah
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