[pypy-dev] What is ABORT_ESCAPE?

I have a JIT I've been working on for a few days now, and initial results were awesome, the JIT log showed just a few assembly ops to execute each iteration of a simple "count to 10000" loop. However, then I changed something and the traces stopped being generated. I hooked up the JIT hooks and noticed that about every 1000 iterations I'd get "ABORT_ESCAPE". After a bit more printing I get this: https://gist.githubusercontent.com/halgari/3cd3cd10f359f2103b89/raw/d8f335f7... Now if I disable virtualizables, everything works fine. What should I be looking for to troubleshoot this? Thanks, Tim