ToT (M56) Daisy-spring board failing bvt-inline test with shutdown exception.

Logs:
Traceback (most recent call last):
  File "/b/cbuild/internal_master/chromite/lib/parallel.py", line 441, in _Run
    self._task(*self._task_args, **self._task_kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/generic_stages.py", line 560, in Run
    self.PerformStage()
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/test_stages.py", line 385, in PerformStage
    debug=debug, subsystems=subsystems, skip_duts_check=skip_duts_check)
  File "/b/cbuild/internal_master/chromite/lib/failures_lib.py", line 172, in wrapped_functor
    return functor(*args, **kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/commands.py", line 927, in RunHWTestSuite
    _HWTestWait(cmd, job_id, **swarming_args)
  File "/b/cbuild/internal_master/chromite/cbuildbot/commands.py", line 1166, in _HWTestWait
    **kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/swarming_lib.py", line 153, in RunSwarmingCommandWithRetries
    return retry_util.RetryCommand(RunSwarmingCommand, max_retry, *args, **kwargs)
  File "/b/cbuild/internal_master/chromite/lib/retry_util.py", line 208, in RetryCommand
    return GenericRetry(ShouldRetry, max_retry, functor, *args, **kwargs)
  File "/b/cbuild/internal_master/chromite/lib/retry_util.py", line 105, in GenericRetry
    ret = functor(*args, **kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/swarming_lib.py", line 92, in RunSwarmingCommand
    result = cros_build_lib.RunCommand(swarming_cmd, *args, **kwargs)
  File "/b/cbuild/internal_master/chromite/lib/cros_build_lib.py", line 594, in RunCommand
    (cmd_result.output, cmd_result.error) = proc.communicate(input)
  File "/usr/lib/python2.7/subprocess.py", line 796, in communicate
    self.wait()
  File "/usr/lib/python2.7/subprocess.py", line 1376, in wait
    pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
  File "/usr/lib/python2.7/subprocess.py", line 476, in _eintr_retry_call
    return func(*args)
  File "/b/cbuild/internal_master/chromite/lib/cros_build_lib.py", line 341, in _KillChildProcess
    if not signals.RelaySignal(original_handler, signum, frame):
  File "/b/cbuild/internal_master/chromite/lib/signals.py", line 26, in RelaySignal
    handler(signum, frame)
  File "/b/cbuild/internal_master/chromite/lib/commandline.py", line 731, in _DefaultHandler
    signum, 'Received signal %i; shutting down' % (signum,))
_ShutDownException: (15, 'Received signal 15; shutting down')


Link to logs:
https://uberchromegw.corp.google.com/i/chromeos/builders/daisy_spring-release/builds/1851/steps/HWTest%20%5Bbvt-inline%5D/logs/stdio

Link to build:
https://uberchromegw.corp.google.com/i/chromeos/builders/daisy_spring-release/builds/1851