https://luci-milo.appspot.com/buildbot/chromeos/wolf-tot-paladin/9254


generic_RebootTest failed HWTests.

http://cautotest.corp.google.com/afe/#tab_id=view_job&object_id=103680646

02/26 22:58:11.137 INFO |        server_job:0184| 	START	----	reboot	timestamp=1488178691	localtime=Feb 26 22:58:11	
02/26 22:58:11.138 INFO |        server_job:0184| 		GOOD	----	reboot.start	timestamp=1488178691	localtime=Feb 26 22:58:11	
02/26 22:58:11.138 DEBUG|          ssh_host:0284| Running (ssh) 'if [ -f '/proc/sys/kernel/random/boot_id' ]; then cat '/proc/sys/kernel/random/boot_id'; else echo 'no boot_id available'; fi'
02/26 22:58:12.040 DEBUG|        base_utils:0280| [stdout] 3fecc143-40bb-47a7-880c-fe89be1ba197
02/26 22:58:12.046 DEBUG|          ssh_host:0284| Running (ssh) '( sleep 1; reboot & sleep 10; reboot -f ) </dev/null >/dev/null 2>&1 & echo -n $!'
02/26 22:58:14.587 ERROR|        base_utils:0280| [stderr] Read from socket failed: Connection reset by peer
02/26 22:58:14.596 INFO |        server_job:0184| 		ABORT	----	reboot.start	timestamp=1488178694	localtime=Feb 26 22:58:14	reboot command failed
02/26 22:58:14.605 INFO |        server_job:0184| 	END FAIL	----	reboot	timestamp=1488178694	localtime=Feb 26 22:58:14	command execution error
  * Command: 
      /usr/bin/ssh -a -x     -o StrictHostKeyChecking=no -o
      UserKnownHostsFile=/dev/null -o BatchMode=yes -o ConnectTimeout=30 -o
      ServerAliveInterval=900 -o ServerAliveCountMax=3 -o ConnectionAttempts=4
      -o Protocol=2 -l root -p 22 chromeos4-row1-rack4-host15 "export
      LIBC_FATAL_STDERR_=1; if type \"logger\" > /dev/null 2>&1; then logger
      -tag \"autotest\" \"server[stack::run_op|reboot|run_background] ->
      ssh_run(( sleep 1; reboot & sleep 10; reboot -f ) </dev/null >/dev/null
      2>&1 & echo -n \\\$!)\";fi; ( sleep 1; reboot & sleep 10; reboot -f )
      </dev/null >/dev/null 2>&1 & echo -n \$!"
  Exit status: 255
  Duration: 2.45978093147
  
  stderr:
  Read from socket failed: Connection reset by peer
  Traceback (most recent call last):
    File "/usr/local/autotest/server/server_job.py", line 938, in run_op
      op_func()
    File "/usr/local/autotest/server/hosts/remote.py", line 143, in reboot
      self.run_background(reboot_cmd)
    File "/usr/local/autotest/server/hosts/ssh_host.py", line 328, in run_background
      return self.run(cmd_fmt % command, verbose=verbose).stdout
    File "/usr/local/autotest/server/hosts/ssh_host.py", line 295, in run
      ssh_failure_retry_ok)
    File "/usr/local/autotest/server/hosts/ssh_host.py", line 252, in _run
      raise error.AutoservRunError("command execution error", result)
  AutoservRunError: command execution error
  * Command: 
      /usr/bin/ssh -a -x     -o StrictHostKeyChecking=no -o
      UserKnownHostsFile=/dev/null -o BatchMode=yes -o ConnectTimeout=30 -o
      ServerAliveInterval=900 -o ServerAliveCountMax=3 -o ConnectionAttempts=4
      -o Protocol=2 -l root -p 22 chromeos4-row1-rack4-host15 "export
      LIBC_FATAL_STDERR_=1; if type \"logger\" > /dev/null 2>&1; then logger
      -tag \"autotest\" \"server[stack::run_op|reboot|run_background] ->
      ssh_run(( sleep 1; reboot & sleep 10; reboot -f ) </dev/null >/dev/null
      2>&1 & echo -n \\\$!)\";fi; ( sleep 1; reboot & sleep 10; reboot -f )
      </dev/null >/dev/null 2>&1 & echo -n \$!"
  Exit status: 255
  Duration: 2.45978093147
  
  stderr:
  Read from socket failed: Connection reset by peer
02/26 22:58:14.610 DEBUG|              test:0389| Test failed due to command execution error
* Command: 
    /usr/bin/ssh -a -x     -o StrictHostKeyChecking=no -o
    UserKnownHostsFile=/dev/null -o BatchMode=yes -o ConnectTimeout=30 -o
    ServerAliveInterval=900 -o ServerAliveCountMax=3 -o ConnectionAttempts=4
    -o Protocol=2 -l root -p 22 chromeos4-row1-rack4-host15 "export
    LIBC_FATAL_STDERR_=1; if type \"logger\" > /dev/null 2>&1; then logger
    -tag \"autotest\" \"server[stack::run_op|reboot|run_background] ->
    ssh_run(( sleep 1; reboot & sleep 10; reboot -f ) </dev/null >/dev/null
    2>&1 & echo -n \\\$!)\";fi; ( sleep 1; reboot & sleep 10; reboot -f )
    </dev/null >/dev/null 2>&1 & echo -n \$!"
Exit status: 255
Duration: 2.45978093147

stderr:
Read from socket failed: Connection reset by peer. Exception log follows the after_iteration_hooks.