It happens on R66(10452.109.0)
caroline，pyro, reef, soraka

08/04 17:10:16.694 DEBUG|              test:0410| Test failed due to vea/vda_unittest failed. Exception log follows the after_iteration_hooks.
08/04 17:10:16.694 DEBUG|              test:0415| Starting after_iteration_hooks for video_HangoutHardwarePerf
08/04 17:10:16.695 DEBUG|      base_sysinfo:0124| Loggable saves logs to /usr/local/autotest/results/default/video_HangoutHardwarePerf/sysinfo/iteration.1/interrupts.after
08/04 17:10:16.695 DEBUG|             utils:0214| Running 'mkdir -p /usr/local/autotest/results/default/video_HangoutHardwarePerf/sysinfo/iteration.1/var/spool'
08/04 17:10:16.699 DEBUG|             utils:0214| Running 'rsync --no-perms --chmod=ugo+r -a --safe-links --exclude=/crash/**autoserv* --exclude=/crash/*.core /var/spool/crash /usr/local/autotest/results/default/video_HangoutHardwarePerf/sysinfo/iteration.1/var/spool'
08/04 17:10:16.704 DEBUG|             utils:0214| Running 'rm -rf /var/spool/crash/*'
08/04 17:10:16.708 DEBUG|      base_sysinfo:0124| Loggable saves logs to /usr/local/autotest/results/default/video_HangoutHardwarePerf/sysinfo/iteration.1/meminfo.after
08/04 17:10:16.709 DEBUG|      base_sysinfo:0124| Loggable saves logs to /usr/local/autotest/results/default/video_HangoutHardwarePerf/sysinfo/iteration.1/slabinfo.after
08/04 17:10:16.709 DEBUG|      base_sysinfo:0124| Loggable saves logs to /usr/local/autotest/results/default/video_HangoutHardwarePerf/sysinfo/iteration.1/schedstat.after
08/04 17:10:16.709 DEBUG|             utils:0214| Running 'logger "autotest finished iteration /usr/local/autotest/results/default/video_HangoutHardwarePerf/sysinfo/iteration.1"'
08/04 17:10:16.713 DEBUG|              test:0420| after_iteration_hooks completed
08/04 17:10:16.713 WARNI|              test:0637| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 631, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 831, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 495, in execute
    dargs)
  File "/usr/local/autotest/common_lib/test.py", line 362, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 400, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/cros/video/helper_logger.py", line 82, in call
    return func(*args, **kwargs)
  File "/usr/local/autotest/cros/chrome_binary_test.py", line 145, in wrapper
    return func(*args, **kargs)
  File "/usr/local/autotest/tests/video_HangoutHardwarePerf/video_HangoutHardwarePerf.py", line 276, in run_once
    decode_videos, encode_videos, measurer)
  File "/usr/local/autotest/tests/video_HangoutHardwarePerf/video_HangoutHardwarePerf.py", line 261, in simulate_hangout
    raise error.TestError('vea/vda_unittest failed')
TestError: vea/vda_unittest failed