Same as this from 2011, I'm getting:
trying to run any of the progress-towards-generalist queries.
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Yeah, according to Nick, the behemoth that is Stack Overflow apparently ate up all of the disk space used for the import:
we are ordering more drive space for the SO import, it went boom this weekend due to growth....oops.
I assume that this is related.
Hopefully something can be done to free up space until the new disks arrive. Nick gave it a kick and you should be good to go now.