The veyron_tiger builders for release branches for M62, 63 and 64 have been failing every run. For M62 and M63 the failures go back months.

https://ci.chromium.org/buildbot/chromeos_release/veyron_tiger-android-mnc-pre-flight-branch%20release-R64-10176.B/

https://ci.chromium.org/buildbot/chromeos_release/veyron_tiger-android-mnc-pre-flight-branch%20release-R63-10032.B/

https://ci.chromium.org/buildbot/chromeos_release/veyron_tiger-android-mnc-pre-flight-branch%20release-R62-9901.B/

Issues 772846 and 780738 are open, but the current failures seem different -- with the UprevAndroid stages logging multiple errors:

17:47:52: INFO: RunCommand: /b/c/cbuild/repository/chromite/bin/cros_sdk 'PARALLEL_EMERGE_STATUS_FILE=/tmp/tmpolpURI' -- emerge-veyron_tiger -p --quiet '=chromeos-base/android-container-4328928-r1' in /b/c/cbuild/repository
17:47:55: ERROR: 
return code: 1; command: /b/c/cbuild/repository/chromite/bin/cros_sdk 'PARALLEL_EMERGE_STATUS_FILE=/tmp/tmpolpURI' -- emerge-veyron_tiger -p --quiet '=chromeos-base/android-container-4328928-r1'
!!! Problem resolving dependencies for =chromeos-base/android-container-4328928-r1
!!! The ebuild selected to satisfy "=chromeos-base/android-container-4328928-r1" for /build/veyron_tiger/ has unmet requirements.
- chromeos-base/android-container-4328928-r1::cheets-private USE="cheets_user direncryption -cheets_aosp_userdebug -cheets_local_img -cheets_userdebug"
  The following REQUIRED_USE flag constraints are unsatisfied:
    !direncryption
  The above constraints are a subset of the following complete expression:
    exactly-one-of ( cheets_aosp_userdebug cheets_user cheets_userdebug ) arm? ( !cheets_aosp_userdebug !cheets_userdebug ) !direncryption
cmd=['/b/c/cbuild/repository/chromite/bin/cros_sdk', 'PARALLEL_EMERGE_STATUS_FILE=/tmp/tmpolpURI', '--', u'emerge-veyron_tiger', '-p', '--quiet', '=chromeos-base/android-container-4328928-r1'], cwd=/b/c/cbuild/repository, extra env={'PARALLEL_EMERGE_STATUS_FILE': '/tmp/tmpolpURI'}
17:47:55: ERROR: Cannot emerge-veyron_tiger =chromeos-base/android-container-4328928-r1
Is Android pinned to an older version?
17:47:55: ERROR: Android is pinned. Unpinning Android and continuing build for Android atom chromeos-base/android-container-4328928-r1. This stage will be marked as failed to prevent an uprev.