buildbot exception 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/617

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

Buildslave for this Build: p64.osuosl.test

Build Reason: scheduler
Build Source Stamp: [branch default] a4de0d3dc35a74b2c4ea5f1d9f45bdd5f31c4a2b
Blamelist: Brendan Cully <brendan at kublai.com>

BUILD FAILED: exception interrupted

sincerely,
 -The Buildbot