So, it looks like the fix is a little bit more complicated and we have a big pr that I’ll merge the fix to this problem. For now, I made a comment on your gist of how to work around the problem. It is an order of destruction problem, because the io_service wants to hand you back an error telling you that you canceled the operation but you’re Receiver is already dead. Hence, the mutex not still being around. I’ll make sure to get that pr merged ASAP.
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