https://build.chromium.org/deprecated/chromium.fyi/buildslaves/build91-b1

PATH: /b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/third_party/android_tools/sdk/platform-tools:/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/build/android:/b/cipd_path_tools:/b/cipd_path_tools/bin:/b/cipd_client:/home/chrome-bot/slavebin:/b/depot_tools:/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
 PWD: /b/build/slave/Android_ChromeDriver_Tests__dbg_/build
 PYTHONIOENCODING: UTF-8
 PYTHONPATH: /b/build/site_config:/b/build/scripts:/b/build/scripts/release:/b/build/third_party:/b/build/third_party/google_api_python_client:/b/build/third_party/httplib2/python2:/b/build/third_party/infra_libs:/b/build/third_party/oauth2client:/b/build/third_party/pyasn1:/b/build/third_party/pyasn1-modules:/b/build/third_party/python-rsa:/b/build/third_party/requests_2_10_0:/b/build/third_party/setuptools-0.6c11:/b/build/third_party/site-packages:/b/build/third_party/uritemplate:/b/build_internal/site_config:/b/build_internal/symsrc:/b/build/slave:/b/build/third_party/buildbot_slave_8_4:/b/build/third_party/twisted_10_2:
 PYTHONUNBUFFERED: 1
 SHELL: /bin/bash
 USER: chrome-bot
 VPYTHON_CLEAR_PYTHONPATH: 1
 VPYTHON_VIRTUALENV_ROOT: /b/c/vpython
I    0.002s TimeoutThread-1-for-MainThread  condition '<lambda>' met (0.0s)
I    0.002s TimeoutThread-1-for-MainThread  [host]> /b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/third_party/android_tools/sdk/platform-tools/adb devices
E    0.065s Main  No available devices to provision.
E    0.066s Main  Local device blacklist: {u'0757a2f000599749': {u'timestamp': 1520791227.740535, u'reason': u'reboot_timeout'}}
E    0.066s Main  Unable to provision local devices.
Traceback (most recent call last):
  File "/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/third_party/catapult/devil/devil/android/tools/provision_devices.py", line 640, in main
    wipe=not args.skip_wipe and not args.emulators)
  File "/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/third_party/catapult/devil/devil/android/tools/provision_devices.py", line 95, in ProvisionDevices
    devices = script_common.GetDevices(devices, blacklist)
  File "/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/third_party/catapult/devil/devil/android/tools/script_common.py", line 47, in GetDevices
    raise device_errors.NoDevicesError()
NoDevicesError: No devices attached.