Looks like they were aborted due to 3 hour timeout of the suite:
https://storage.cloud.google.com/chromeos-autotest-results/194918208-chromeos-test/hostless/debug/autoserv.DEBUG?_ga=2.245487111.-2071375581.1524526619

Did rerunning also fail?

reruns tests are queued state https://ubercautotest.corp.google.com/afe/#tab_id=view_job&object_id=195229951

This is only for two delta payloads 10176.76.0 and 9765.85.0

No recent changes in the AU that may be suspected as reason why the test would not pas son retries/next build (removing RBS)

We can close once retries succeed

retries also aborted https://ubercautotest.corp.google.com/afe/#tab_id=view_job&object_id=195229951

I wonder if they were aborted because the shard was restarted to fix the stout devserver bug yesterday. either way it looks like you have already kicked off another run 

Moving this out of triage queue

No longer a problem:
https://stainless.corp.google.com/search?view=list&first_date=2018-12-01&last_date=2018-12-07&suite=%5Epaygen_au_stable%24&board=%5Echell%24&exclude_cts=true&exclude_not_run=false&exclude_non_release=true&exclude_au=false&exclude_acts=true&exclude_retried=true&exclude_non_production=true