Canary build failed with the following error

Saving memory snapshot to /b/cbuild/internal_master/chroot/tmp/cbuildboten6Qoj/test_harness/failed/SimpleTestVerify/1_autotest_tests/chromiumos_qemu_mem.bin.7tOKvX...
    freezing VM...
2016/11/28 06:39:46 transport: http2Client.notifyError got notified that the client transport was broken EOF.
2016/11/28 06:43:46 transport: http2Client.notifyError got notified that the client transport was broken EOF.
2016/11/28 06:47:46 transport: http2Client.notifyError got notified that the client transport was broken EOF.
2016/11/28 06:51:46 transport: http2Client.notifyError got notified that the client transport was broken EOF.
2016/11/28 06:55:46 transport: http2Client.notifyError got notified that the client transport was broken EOF.
2016/11/28 06:59:46 transport: http2Client.notifyError got notified that the client transport was broken EOF.
07:02:00: INFO: Refreshing due to a 401 (attempt 1/2)
07:02:00: INFO: Refreshing access_token
Traceback (most recent call last):
  File "bin/ctest", line 293, in <module>
    main()
  File "bin/ctest", line 284, in main
    opts.suite)
  File "bin/ctest", line 210, in RunAUTestHarness
    error_code_ok=True, kill_timeout=10 * 60)
  File "/b/cbuild/internal_master/chromite/lib/cros_build_lib.py", line 593, 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 343, in _KillChildProcess
    raise TerminateRunCommandError('Received signal %i' % signum, cmd_result)
chromite.lib.cros_build_lib.TerminateRunCommandError: return code: 3840; command: /b/cbuild/internal_master/src/platform/crostestutils/au_test_harness/cros_au_test_harness.py '--base_image=/b/cbuild/internal_master/src/build/images/cyan/latest-cbuildbot/chromiumos_test_image.bin' '--target_image=/b/cbuild/internal_master/src/build/images/cyan/latest-cbuildbot/chromiumos_test_image.bin' '--board=cyan' '--type=vm' '--remote=0.0.0.0' --verbose '--jobs=1' '--ssh_private_key=/b/cbuild/internal_master/src/build/images/cyan/latest-cbuildbot/id_rsa' '--verify_suite_name=smoke' '--test_prefix=SimpleTestVerify' '--test_results_root=/b/cbuild/internal_master/chroot/tmp/cbuildboten6Qoj/test_harness' --no_graphics --whitelist_chrome_crashes
Received signal 15