I see this occasionally. It's not specific to 0.3.3.x. I reported it back in 
October 2017:


Roger replied here:


MaxMemInQueues is set to 1.5 GB by default, which is why the problematic 
circuit uses that much RAM before its killed. You can lower MaxMemInQueues in 
torrc, however that will obviously have other impacts on your relay. If you 
have plenty of RAM, I'd maybe just leave things alone for now since Tor is 
already killing the circuit.

I agree in theory some mitigation against this would be nice, but I'm not smart 
enough to offer anything specific. It seems Roger and other devs are already 
thinking about the issue.

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