This builder (https://uberchromegw.corp.google.com/i/chromeos.chrome/builders/Chrome%20LKGM?numbuilds=200) has been failing for a while now. Most recent failure seem to be an authentication problem.


00:01:00: ERROR: Failed to download CIDB creds from gs.
Can try obtaining your credentials at go/cros-cidb-admin and manually passing it in with --cred-dir.
cros_best_revision: Unhandled exception:
Traceback (most recent call last):
  File "/b/rr/tmpN24Crs/w/chromite/bin/cros_best_revision", line 168, in <module>
    DoMain()
  File "/b/rr/tmpN24Crs/w/chromite/bin/cros_best_revision", line 164, in DoMain
    commandline.ScriptWrapperMain(FindTarget)
  File "/b/rr/tmpN24Crs/w/chromite/lib/commandline.py", line 837, in ScriptWrapperMain
    ret = target(argv[1:])
  File "/b/rr/tmpN24Crs/w/chromite/scripts/cros_best_revision.py", line 293, in main
    cidb_creds = GetCidbCreds(args.cred_dir)
  File "/b/rr/tmpN24Crs/w/chromite/scripts/cros_best_revision.py", line 280, in GetCidbCreds
    cidb_creds = cros_cidbcreds.CheckAndGetCIDBCreds()
  File "/b/rr/tmpN24Crs/w/chromite/cli/cros/cros_cidbcreds.py", line 33, in CheckAndGetCIDBCreds
    with locking.FileLock(cidb_dir_lock).write_lock():
  File "/b/rr/tmpN24Crs/w/chromite/lib/locking.py", line 162, in write_lock
    self._enforce_lock(fcntl.LOCK_EX, message)
  File "/b/rr/tmpN24Crs/w/chromite/lib/locking.py", line 85, in _enforce_lock
    self.locking_mechanism(self.fd, flags|fcntl.LOCK_NB)
  File "/b/rr/tmpN24Crs/w/chromite/lib/locking.py", line 71, in fd
    self._fd = self._GetFd()
  File "/b/rr/tmpN24Crs/w/chromite/lib/locking.py", line 251, in _GetFd
    fd = os.open(self.path, os.W_OK|os.O_CREAT|cloexec, 0o666)
OSError: [Errno 2] No such file or directory: '/b/rr/tmpN24Crs/w/.cros_cache/cidb_creds.lock'

Any idea how to fix this?