The latest EC2 plugin seems to have broken node launch.
With 1.21 nodes used to provision correctly from Manage Nodes or on-demand (though, per Issue
JENKINS-23787 they weren't spooled up correctly after stopping on idle).
Now, launch of new nodes or starting existing nodes is failing with:
It looks like the plugin is trying to execute some XML as a script.
The Jenkins logs contain:
though it's not clear if that's related.