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/162

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

Buildslave for this Build: l6

Build Reason: scheduler
Build Source Stamp: [branch stable] 323de4f49bd1f037eaa39400c4beef7733fab2c0
Blamelist: Matt Mackall <mpm at selenic.com>

BUILD FAILED: failed http2

sincerely,
 -The Buildbot