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/534

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

Buildslave for this Build: p64.osuosl.test

Build Reason: scheduler
Build Source Stamp: [branch default] f56278a0a0c56fe0c6c02ef8e23dbe0cadb9df69
Blamelist: Bryan O'Sullivan <bryano at fb.com>

BUILD FAILED: failed http2

sincerely,
 -The Buildbot