buildbot failure in Mercurial on hg tests (stable)

[hgbuildbot at kublai.com]

The Buildbot has detected a new failure on builder hg tests (stable) while building hg.
Full details are available at:
 http://hgbuildbot.kublai.com/builders/hg%20tests%20%28stable%29/builds/170

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

Buildslave for this Build: l6

Build Reason: scheduler
Build Source Stamp: [branch stable] 2e8342aeab498f6f429e63e81a849830f0478815
Blamelist: FUJIWARA Katsunori <foozy at lares.dti.ne.jp>,Mads Kiilerich <mads at kiilerich.com>,Matt Mackall <mpm at selenic.com>,Pierre-Yves David <pierre-yves.david at ens-lyon.org>,Pierre-Yves David <pierre-yves.david at logilab.fr>

BUILD FAILED: failed http2

sincerely,
 -The Buildbot