No URLs matched: gs://chromeos-releases/canary-channel/arkham/11034.0.0/payloads/signing/28042-140620160403264/1.payload.hash.update_signer.signed.bin
cmd=['/b/swarming/w/ir/cache/cbuild/repository/.cache/common/gsutil_4.33.tar.gz/gsutil/gsutil', '-o', 'Boto:num_retries=10', 'stat', '--', 'gs://chromeos-releases/canary-channel/arkham/11034.0.0/payloads/signing/28042-140620160403264/1.payload.hash.update_signer.signed.bin'], extra env={'BOTO_CONFIG': '/home/chrome-bot/.boto'}

That seems like solidly flake territory. Perhaps GS hadn't yet made the object available in all replicas. Closing as such. If this happens again or increases with frequency, we can add more retry logic around this.

Happened again

https://cros-goldeneye.corp.google.com/chromeos/healthmonitoring/buildDetails?id=2908839

Over to current oncall to investigate if it's the same symptoms.

both builds are identical, id=2908839 on 9/4/2018 ... so definitely the same symptom :-)