Another test failure in the same  kevin-paladin build. Connection to the dut was broken and DNS failure was showed on the log.


http://cautotest.corp.google.com/afe/#tab_id=view_job&object_id=113664502


https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/113664502-chromeos-test/chromeos2-row8-rack8-host2/debug


04/21 08:33:25.254 INFO |      abstract_ssh:0795| Master ssh connection to chromeos2-row8-rack8-host2 is down.
04/21 08:33:25.254 DEBUG|      abstract_ssh:0756| Nuking master_ssh_job.
04/21 08:33:25.255 DEBUG|      abstract_ssh:0762| Cleaning master_ssh_tempdir.
04/21 08:33:25.256 INFO |      abstract_ssh:0809| Starting master ssh connection '/usr/bin/ssh -a -x   -N -o ControlMaster=yes -o ControlPath=/tmp/_autotmp_iqAQJjssh-master/socket -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 chromeos2-row8-rack8-host2'
04/21 08:33:25.256 DEBUG|        base_utils:0185| Running '/usr/bin/ssh -a -x   -N -o ControlMaster=yes -o ControlPath=/tmp/_autotmp_iqAQJjssh-master/socket -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 chromeos2-row8-rack8-host2'
04/21 08:33:30.392 INFO |      abstract_ssh:0824| Timed out waiting for master-ssh connection to be established.
04/21 08:33:30.394 DEBUG|      abstract_ssh:0357| Using Rsync.
04/21 08:33:30.395 DEBUG|        base_utils:0185| Running 'rsync -l  --timeout=1800 --rsh='/usr/bin/ssh -a -x   -o ControlPath=/tmp/_autotmp_iqAQJjssh-master/socket -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' -az --no-o --no-g root@chromeos2-row8-rack8-host2:"/usr/local/autotest/results/default/" "/usr/local/autotest/results/113664502-chromeos-test/chromeos2-row8-rack8-host2"'
04/21 08:36:24.316 WARNI|      abstract_ssh:0387| trying scp, rsync failed: Command <rsync -l  --timeout=1800 --rsh='/usr/bin/ssh -a -x   -o ControlPath=/tmp/_autotmp_iqAQJjssh-master/socket -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' -az --no-o --no-g root@chromeos2-row8-rack8-host2:"/usr/local/autotest/results/default/" "/usr/local/autotest/results/113664502-chromeos-test/chromeos2-row8-rack8-host2"> failed, rc=255, Command returned non-zero exit status
* Command: 
    rsync -l  --timeout=1800 --rsh='/usr/bin/ssh -a -x   -o ControlPath=/tmp
    /_autotmp_iqAQJjssh-master/socket -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' -az --no-o --no-g
    root@chromeos2-row8-rack8-host2:"/usr/local/autotest/results/default/"
    "/usr/local/autotest/results/113664502-chromeos-
    test/chromeos2-row8-rack8-host2"
Exit status: 255
Duration: 173.809476137

stderr:
ssh: Could not resolve hostname chromeos2-row8-rack8-host2: Name or service not known
rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]

network outage root cause, nxia to de-dupe