Rosserial nodes not starting after last update

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I just ran a ROS package update on my Ubuntu 16.04 system, and now none of my rosserial serial_node.py instances are starting.

My launch file is like:

<launch>
    <group ns="torso_arduino">
        <node pkg="rosserial_arduino" type="serial_node.py" name="serial_node" output="screen">
            <param name="~port" command="/dev/ttyACM0" />
            <param name="~baud" value="115200" />
        </node>
    </group>
</launch>

but running this now results in:

[rospy.client][INFO] '2018-05-30 23:43:20': init_node, name[/torso_arduino/serial_node], pid[1195]
[xmlrpc][INFO] '2018-05-30 23:43:20': XML-RPC server binding to 0.0.0.0:0
[xmlrpc][INFO] '2018-05-30 23:43:20': Started XML-RPC server [http://robot:33755/]
[rospy.impl.masterslave][INFO] '2018-05-30 23:43:20': _ready: http://robot:33755/
[xmlrpc][INFO] '2018-05-30 23:43:20': xml rpc node: starting XML-RPC server
[rospy.registration][INFO] '2018-05-30 23:43:20': Registering with master node http://localhost:11311
[rospy.init][INFO] '2018-05-30 23:43:20': ROS Slave URI: [http://robot:33755/]
[rospy.init][INFO] '2018-05-30 23:43:20': registered with master
[rospy.rosout][INFO] '2018-05-30 23:43:20': initializing /rosout core topic
[rospy.rosout][INFO] '2018-05-30 23:43:20': connected to core topic /rosout
[rospy.simtime][INFO] '2018-05-30 23:43:20': /use_sim_time is not set, will not subscribe to simulated time [/clock] topic
[rosout][INFO] '2018-05-30 23:43:20': ROS Serial Python Node
[rospy.internal][INFO] '2018-05-30 23:43:20': topic[/rosout] adding connection to [/rosout], count 0
[rosout][INFO] '2018-05-30 23:43:20': Connecting to /dev/ttyACM0 at 115200 baud
[rospy.core][INFO] '2018-05-30 23:43:20': signal_shutdown [atexit]
[rospy.internal][INFO] '2018-05-30 23:43:20': topic[/rosout] removing connection to /rosout
[rospy.impl.masterslave][INFO] '2018-05-30 23:43:20': atexit

How do I read this? It's not producing any error log messages, but it seems to be saying it's getting a signal to exit, but it's unclear where.

What's changed and how do I fix this? Is it normal for such a massive backward-compatible change been made to an LTS release?