Intermittent "Connection reset by peer" for in-process channel in a recv() with a queued message but no sender

[jdm]

We got a panic in this code in Servo:

226                 Command::Exit(result) => {
227                     result.send(()).unwrap();
228                     break;
229                 }
...
382     pub fn exit(&self) {
383         let (response_chan, response_port) = ipc::channel().unwrap();
384         self.chan.send(Command::Exit(response_chan)).unwrap();
385         response_port.recv().unwrap();
386     }

The panic:

  │ thread 'Constellation' panicked at 'called `Result::unwrap()` on an `Err` value: Error { repr: Os { code: 104, message: "Connection reset by peer" } }', ../src/libcore/result.rs:688

This is on Linux.

[jdm]

That's the unwrap on line 385 that's panicking.