Last night's M72 build failed early on ManifestVersionSync:
https://logs.chromium.org/logs/chromeos/buildbucket/cr-buildbucket.appspot.com/8924560588310121920/+/steps/ManifestVersionedSync/0/stdout

I kicked off the builders again hoping it's transient but it's critical we get this cleared up to support an already late FSI for octopus.

I'll kick off a bug with similar.

Logs

cmd=['git', 'push', 'origin', 'temp_auto_checkin_branch:refs/heads/master'], cwd=/b/swarming/w/ir/cache/cbuild/repository/manifest-versions-internal
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 751, in PerformStage
    next_manifest = self.GetNextManifest()
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 649, in GetNextManifest
    to_return = self.manifest_manager.GetNextBuildSpec(build_id=build_id)
  File "/b/swarming/w/ir/cache/cbuild/repository/chromite/cbuildbot/manifest_version.py", line 987, in GetNextBuildSpec
    raise GenerateBuildSpecException(last_error)
GenerateBuildSpecException: Failed to generate buildspec. error: return code: 1; command: git push origin temp_auto_checkin_branch:refs/heads/master
To https://chrome-internal.googlesource.com/chromeos/manifest-versions
 ! [rejected]                temp_auto_checkin_branch -> master (fetch first)
error: failed to push some refs to 'https://chrome-internal.googlesource.com/chromeos/manifest-versions'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

cmd=['git', 'push', 'origin', 'temp_auto_checkin_branch:refs/heads/master'], cwd=/b/swarming/w/ir/cache/cbuild/repository/manifest-versions-internal
 to fail.