Output is:

I    0.006s TimeoutThread-1-for-MainThread  condition '<lambda>' met (0.0s)
I    0.007s TimeoutThread-1-for-MainThread  [host]> /b/c/b/Android32_Tests__K_Nexus5_/src/third_party/android_tools/sdk/platform-tools/adb devices
E    0.013s Main  No available devices to provision.
E    0.013s Main  Local device blacklist: {u'06a18b77003c05ac': {u'timestamp': 1527749582.241036, u'reason': u'reboot_timeout'}}
E    0.016s Main  Unable to provision local devices.
Traceback (most recent call last):
  File "/b/c/b/Android32_Tests__K_Nexus5_/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/c/b/Android32_Tests__K_Nexus5_/src/third_party/catapult/devil/devil/android/tools/provision_devices.py", line 95, in ProvisionDevices
    devices = script_common.GetDevices(devices, blacklist)
  File "/b/c/b/Android32_Tests__K_Nexus5_/src/third_party/catapult/devil/devil/android/tools/script_common.py", line 47, in GetDevices
    raise device_errors.NoDevicesError()
NoDevicesError: No devices attached.
step returned non-zero exit code: 87

Started happening here: https://build.chromium.org/p/client.webrtc.perf/builders/Android32%20Tests%20%28K%20Nexus5%29/builds/6587