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/506

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

Buildslave for this Build: p64.osuosl.test

Build Reason: scheduler
Build Source Stamp: [branch default] 4921b5c2aeed8a6bb0918503f7802508538f01e5
Blamelist: Matt Mackall <mpm at selenic.com>

BUILD FAILED: failed http2

sincerely,
 -The Buildbot