A number of trybots are failing with this error:

Traceback (most recent call last):
  File "/b/cbuild/internal_master/chromite/lib/parallel.py", line 440, in _Run
    self._task(*self._task_args, **self._task_kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/artifact_stages.py", line 266, in ArchiveHWQual
    image_dir)
  File "/b/cbuild/internal_master/chromite/cbuildbot/commands.py", line 2572, in ArchiveHWQual
    cros_build_lib.RunCommand(cmd, capture_output=True)
  File "/b/cbuild/internal_master/chromite/lib/cros_build_lib.py", line 625, in RunCommand
    raise RunCommandError(msg, cmd_result)
RunCommandError: return code: 1; command: /b/cbuild/internal_master/src/scripts/archive_hwqual --from /b/cbuild/internal_master/buildbot_archive/daisy_spring-release/R59-9430.3.0 --image_dir /b/cbuild/internal_master/src/build/images/daisy_spring/latest-cbuildbot --ssh_private_key /b/cbuild/internal_master/src/build/images/daisy_spring/latest-cbuildbot/id_rsa --output_tag chromeos-hwqual-daisy_spring-R59-9430.3.0
cp: cannot open `/b/cbuild/internal_master/chromite/scripts/gs_fetch_binpkg.pyc' for reading: Permission denied
cp: cannot open `/b/cbuild/internal_master/chromite/scripts/gconv_strip.pyc' for reading: Permission denied
cp: cannot open `/b/cbuild/internal_master/chromite/scripts/cros_generate_local_binhosts.pyc' for reading: Permission denied
cp: cannot open `/b/cbuild/internal_master/chromite/scripts/cros_env_whitelist.pyc' for reading: Permission denied
cp: cannot open `/b/cbuild/internal_master/chromite/cros/__init__.pyc' for reading: Permission denied
cp: cannot open `/b/cbuild/internal_master/chromite/cros/test/__init__.pyc' for reading: Permission denied
cp: cannot open `/b/cbuild/internal_master/chromite/cros/test/image_test.pyc' for reading: Permission denied
cp: cannot open `/b/cbuild/internal_master/chromite/licensing/licenses.pyc' for reading: Permission denied
cp: cannot open `/b/cbuild/internal_master/chromite/third_party/lddtree.pyc' for reading: Permission denied
ERROR   : Thu Apr  6 15:28:30 PDT 2017
ERROR   :  PGID  PPID   PID     ELAPSED     TIME %CPU COMMAND
ERROR   : Arguments of 27219:  '--from' '/b/cbuild/internal_master/buildbot_archive/daisy_spring-release/R59-9430.3.0' '--image_dir' '/b/cbuild/internal_master/src/build/images/daisy_spring/latest-cbuildbot' '--ssh_private_key' '/b/cbuild/internal_master/src/build/images/daisy_spring/latest-cbuildbot/id_rsa' '--output_tag' 'chromeos-hwqual-daisy_spring-R59-9430.3.0'
ERROR   : Backtrace:  (most recent call is last)
ERROR   :  archive_hwqual:106:main(), called: main '--from' '/b/cbuild/internal_master/buildbot_archive/daisy_spring-release/R59-9430.3.0' '--image_dir' '/b/cbuild/internal_master/src/build/images/daisy_spring/latest-cbuildbot' '--ssh_private_key' '/b/cbuild/internal_master/src/build/images/daisy_spring/latest-cbuildbot/id_rsa' '--output_tag' 'chromeos-hwqual-daisy_spring-R59-9430.3.0' 
ERROR   :  archive_hwqual:93:main(), called: die_err_trap  
ERROR   : 
ERROR   : Command failed:
ERROR   :   Command 'cp -a "${GCLIENT_ROOT}/chromite" "tarball/${FLAGS_output_tag}"' exited with nonzero code: 1

Example build page:
https://uberchromegw.corp.google.com/i/chromiumos.tryserver/builders/release/builds/10272