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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