(As expected, the original FreeBSD randomization seed passed here without any problems)

Before I disabled the test completely, I did a run with full error diffs enabled.

Here's the FreeBSD log with full diffs:
http://buildbot.python.org/all/builders/AMD64%20FreeBSD%2010.0%203.x/builds/580/steps/test/logs/stdio

This indicates both "{0.stdout.encoding}" and "{0.stdout.encoding}" produced the string "None" in the formatting operation that creates the expected output.

The Ubuntu run exhibits the same behaviour:
http://buildbot.python.org/all/builders/AMD64%20Ubuntu%20LTS%203.x/builds/2717/steps/test/logs/stdio

Note that on both symptoms, the later run passes without a problem, and (aside from the full diff being enabled the second time), the symptoms were identical (further pushing against a cross-test compatibility problem).

And the full gory list of failed logs with this error and the full diffs:
http://buildbot.python.org/all/builders/AMD64%20OpenIndiana%203.x/builds/6502/steps/test/logs/stdio
http://buildbot.python.org/all/builders/AMD64%20Snow%20Leop%203.x/builds/170/steps/test/logs/stdio
http://buildbot.python.org/all/builders/x86%20Gentoo%20Non-Debug%203.x/builds/5175/steps/test/logs/stdio
http://buildbot.python.org/all/builders/AMD64%20FreeBSD%209.0%203.x/builds/5508/steps/test/logs/stdio
http://buildbot.python.org/all/builders/x86%20Ubuntu%20Shared%203.x/builds/8767/steps/test/logs/stdio

I couldn't find a full diff failure for this one, but this log has the truncated diff:
http://buildbot.python.org/all/builders/PPC64%20PowerLinux%203.x/builds/861/steps/test/logs/stdio