deferred is marked as volatile and I only set it, so it should be thread safe(?)

You're asking that question from a very weak position. when using

kotlinx.coroutines

, its best to stay away from

volatile

,

java.util.concurrent

et al. I also suspect you're trying to use a deferred, which is fundamentally a one-shot value type, as the facade into a running process (which it is not).

yeah your guess is right about using a deferred as facade of a process, it was an existing code that I was trying to improve, but looks like ConflatedBroadcastChannel is exactly what I need!