RStudio hangs waiting for a message that never appears

I have code that runs in RStudio (latest build) using Shiny. The code runs fine with test data but then hangs waiting for a message that never appears.

A stack trace (MacBook):

If that image doesn't upload properly, the thread is sleeping in the QEventLoop ultimately waiting on mach_msg_trap. My application still runs normally when I feed it other data.

Is this a race condition in RStudio code that only shows up under heavy load or is it some sort of application bug (if so, how to diagnose?)

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