Investigating check_self error

We see an increasing trend of crash related to check_self. Is this safe to ignore? Is there any way to investigate what is this about?

We're seeing these too and I think this thread is related. GenServer terminating periodically

It seems like the self_check was introduced somewhere around here

But from the description of the PR, it should only trigger fairly rarely when two :poll are sent close to each other. Can anyone comment to the expected frequency of those messages (and whether something unrelated might be tripping these up).

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