"no space left on device" errors in crater runs

[joshtriplett]

https://crater-reports.s3.amazonaws.com/pr-135073/try%234ec39038fd22a66b0c9ee73b1965efe2f242174a/reg/java_string-0.1.2/log.txt

I don't know if this report belongs here or somewhere else.

[Skgland]

I think that specific one should be fixed by #760 and overlaps somewhat with #700