This caused a cq failure.
http://cautotest.corp.google.com/afe/#tab_id=view_job&object_id=91691419
Click on Server Control File.
# INJECT_BEGIN - DO NOT DELETE THIS LINE
run_prod_code=False
devserver_url='http://100.115.219.135:8082'
builds={'cros-version': 'winky-paladin/R57-9104.0.0-rc1'}
check_hosts=True
wait_for_results=True
offload_failures_only=True
suite_args="{'attr_filter': '(suite:bvt-inline) and (subsystem:default)'}"
test_source_build='winky-paladin/R57-9104.0.0-rc1'
file_bugs=False
priority=70
max_retries=10
num=6
board='winky'
timeout=24
timeout_mins=90
job_retry=True
max_runtime_mins=1440
delay_minutes=0
pool='cq'
build='winky-paladin/R57-9104.0.0-rc1'
args_dict={'run_prod_code': False, 'devserver_url': 'http://100.115.219.135:8082', 'builds': {'cros-version': 'winky-paladin/R57-9104.0.0-rc1'}, 'check_hosts': True, 'wait_for_results': True, 'offload_failures_only': True, 'suite_args': "{'attr_filter': '(suite:bvt-inline) and (subsystem:default)'}", 'test_source_build': 'winky-paladin/R57-9104.0.0-rc1', 'file_bugs': False, 'priority': 70, 'max_retries': 10, 'num': 6, 'board': 'winky', 'timeout': 24, 'timeout_mins': 90, 'job_retry': True, 'max_runtime_mins': 1440, 'delay_minutes': 0, 'pool': 'cq', 'build': 'winky-paladin/R57-9104.0.0-rc1'}
# INJECT_END - DO NOT DELETE LINE
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>502 Proxy Error</title>
</head><body>
<h1>Proxy Error</h1>
<p>The proxy server received an invalid
response from an upstream server.<br />
The proxy server could not handle the request <em><a href="/controlfiles">GET /controlfiles</a></em>.<p>
Reason: <strong>Error reading from remote server</strong></p></p>
<hr>
<address>Apache/2.4.7 (Ubuntu) Server at 100.115.219.135 Port 8082</address>
</body></html>
That injection is a bad response from the devserver.
Comment 1 by autumn@chromium.org
, Jan 4 2017