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Due to an image setup bug (I have a fix proposed currently), I was
able to rerun this on a VM in HPCloud with 30GB memory and it
completed in about an hour with a couple of tempest tests failing.
Logs at: http://fungi.yuggoth.org/tmp/logs3.tar

Rerunning again on another 8GB Rackspace VM with the job timeout
increased to 5 hours, I was able to recreate the network
connectivity issues exhibited previously. The job itself seems to
have run for roughly 3 hours while failing 15 tests, and the worker
was mostly unreachable for a while at the end (I don't know exactly
how long) until around the time it completed. The OOM condition is
present this time too according to the logs, occurring right near
the end of the job. Collected logs are available at:
http://fungi.yuggoth.org/tmp/logs4.tar

Given the comparison between these two runs, I suspect this is
either caused by memory constraints or block device I/O performance
differences (or perhaps an unhappy combination of the two).
Hopefully a close review of the logs will indicate which.
-- 
Jeremy Stanley