The panic message "unexpected execution error" most likely comes from tokio, specifically current_thread::Runtime::block_on (calling into_inner on an error returned from blocked on future), which is called from AudioIPC's core::spawn_thread. AudioIPC is blocking on the receiver of a oneshot::channel for signalling shutdown, so it might mean that somthing unexpected happened to the sender side of the channel. Not sure what would cause this yet, will continue investigating.
Bug 1622931 Comment 3 Edit History
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The panic message "unexpected execution error" most likely comes from tokio, specifically current_thread::Runtime::block_on (calling into_inner on an error returned from blocked on future), which is called from AudioIPC's core::spawn_thread. AudioIPC is blocking on the receiver of a oneshot::channel for signalling shutdown, so it might mean that something unexpected happened to the sender side of the channel. Not sure what would cause this yet, will continue investigating.