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Ah-ha!

- The first thread is in the poller, dispatching a command, invoking a callback handler with mutex `0x1e4600a0`.
- The second thread is a callback handler, holding mutex `0x1e4600a0`, that is sending a command to the poller and waiting for a response.

Classic order-of-lock issue.  Poller is waiting on the mutex held by callback; callback is holding on the mutex waiting on the poller.

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