loading.mobile failing on 3 builders

Builders failed on: 
- Android Nexus5X Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus5X%20Perf
- Android Nexus6 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus6%20Perf
- Android Nexus6 WebView Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus6%20WebView%20Perf

These all look like they're unrelated to the actual test.

https://chromium-swarm.appspot.com/task?id=37c0ded1fcd7de10&refresh=10&show_raw=1 looks like the device died during the middle of the test or something? https://chromium-swarm.appspot.com/task?id=37c0a5161143ff10&refresh=10&show_raw=1 looks similar; the test finishes, and then fails to unmap some ports. 

https://chromium-swarm.appspot.com/task?id=37be6845581de910&refresh=10&show_raw=1 looks different to me, but I might be reading it wrong.

Can someone take a look at this?