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Checker Concurrency Issues?


With cs_checker_parallel_checks >= 1, there is a chance that the results recorded to the problemstate log are not actually associated with the most recent submission. A check should be added to make sure that the result we just computed is actually associated with the most recent submission before writing to the problemstate log.

I think this is what happened on 6.009's quiz 3 last term, where several students' submissions were left spinning.

Some work needs to be done here to reproduce the issue before we can really track down a fix.


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