build 2-b1 (Android Tests (dbg) (K Nexus5)) seems to have problems with its devices, it fails with:

I    0.004s TimeoutThread-1-for-MainThread  [host]> /b/c/b/Android_Tests__dbg___K_Nexus5_/src/third_party/android_tools/sdk/platform-tools/adb devices
step returned non-zero exit code: 87
@@@STEP_EXCEPTION@@@

Full logs at
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Android%20Tests%20%28dbg%29%20%28K%20Nexus5%29/builds/10711/steps/provision_devices/logs/stdio

Is it a problem with its devices or is the bot misconfigured somehow?