buildbot failure in Mercurial on hg tests

[hgbuildbot at kublai.com]

The Buildbot has detected a new failure on builder hg tests while building hg.
Full details are available at:
 http://hgbuildbot.kublai.com/builders/hg%20tests/builds/660

Buildbot URL: http://hgbuildbot.kublai.com/

Buildslave for this Build: p64.osuosl.test

Build Reason: scheduler
Build Source Stamp: [branch default] 79e5de2bfa8cd18e81e71fbba1a62eee15b5e354
Blamelist: Siddharth Agarwal <sid0 at fb.com>

BUILD FAILED: failed perfmanifest (python)

sincerely,
 -The Buildbot