Defer cancel() causes non-determinstic error

[longquanzheng]

WF(){
   ctx, cancel := workflow.WithCancel(ctx)
   defer cancel()
   scheduleActivities...
}

Looks like this would cause non-deterministic error when workflow is kicked out of cache(cancel() will be called) We need to write test to verify it and see if we can fix this issue.

[mfateev]

This doesn't make sense as no decision task should be running while workflow is kicked out of the cache. The only possibility is that there is a race condition between a decision task execution and cache eviction.

[Groxx]

there's a decent chance this was filed for the errors I'm seeing. if so: we've been investigating in a lot more detail, our defers don't seem related.