https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/58957861-chromeos-test/chromeos2-row5-rack10-host1/

Consistently has been failing over the weekend.  Latest failures have been due to cros_updater.py raising a command exception trying to run this command:

/usr/bin/ssh -a -x    -o ControlPath=/tmp/_autotmp_ZUgPoIssh-
      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-row5-rack10-host1 "export LIBC_FATAL_STDERR_=1;
      /tmp/stateful_update --stateful_change=reset 2>&1"
  Exit status: 126
  Duration: 0.163176059723
  
  stdout:
  bash: /tmp/stateful_update: Permission denied

Not sure what changed, will try to repro on my moblab.