https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/97028374-chromeos-test/chromeos4-row4-rack11-host20/autoupdate_logs/

mktemp: failed to create directory via template '/mnt/stateful_partition/unencrypted/preserve/cros-update/tmp.XXXXXXXXXX': Read-only file system

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.

Search the bug tracker, only related bug found is bug 641424

Not sure if this is just a flake or something we should dig deeper.