After restarting CQ,

wizpig-paladin keep failing at CommitQueueSync with following message:

[1;31m20:21:44: ERROR: <class 'chromite.lib.cros_build_lib.RunCommandError'>: return code: 255; command: repo forall -c git fetch --all
cmd=['repo', 'forall', '-c', 'git', 'fetch', '--all'], cwd=/b/swarming/w/ir/cache/cbuild/repository
Traceback (most recent call last):
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/lib/failures_lib.py", line 230, in wrapped_functor
    return functor(*args, **kwargs)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 794, in PerformStage
    self.ManifestCheckout(new_manifest)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 1109, in ManifestCheckout
    super(CommitQueueSyncStage, self).ManifestCheckout(next_manifest)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 438, in ManifestCheckout
    self.repo.FetchAll()
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/repository.py", line 637, in FetchAll
    cros_build_lib.RunCommand(cmd, cwd=self.directory)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/lib/cros_build_lib.py", line 650, in RunCommand
    raise RunCommandError(msg, cmd_result)
RunCommandError: return code: 255; command: repo forall -c git fetch --all
cmd=['repo', 'forall', '-c', 'git', 'fetch', '--all'], cwd=/b/swarming/w/ir/cache/cbuild/repository

20:21:44: INFO: Translating result <class 'chromite.lib.cros_build_lib.RunCommandError'>: return code: 255; command: repo forall -c git fetch --all
cmd=['repo', 'forall', '-c', 'git', 'fetch', '--all'], cwd=/b/swarming/w/ir/cache/cbuild/repository
Traceback (most recent call last):
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/lib/failures_lib.py", line 230, in wrapped_functor
    return functor(*args, **kwargs)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 794, in PerformStage
    self.ManifestCheckout(new_manifest)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 1109, in ManifestCheckout
    super(CommitQueueSyncStage, self).ManifestCheckout(next_manifest)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 438, in ManifestCheckout
    self.repo.FetchAll()
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/repository.py", line 637, in FetchAll
    cros_build_lib.RunCommand(cmd, cwd=self.directory)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/lib/cros_build_lib.py", line 650, in RunCommand
    raise RunCommandError(msg, cmd_result)
RunCommandError: return code: 255; command: repo forall -c git fetch --all
cmd=['repo', 'forall', '-c', 'git', 'fetch', '--all'], cwd=/b/swarming/w/ir/cache/cbuild/repository
 to fail.

+wtlee
How about we label it as EXPERIMENTAL first?