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/376

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

Buildslave for this Build: p64.osuosl.test

Build Reason: scheduler
Build Source Stamp: [branch stable] bd5c1b49d106edc9975d29b5cf6d0960a4b33e27
Blamelist: Bryan O'Sullivan <bryano at fb.com>,FUJIWARA Katsunori <foozy at lares.dti.ne.jp>

BUILD FAILED: failed http2

sincerely,
 -The Buildbot