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I fixed it.

It turns out the tranmission tags in my urdf were wrong. I had a couple joints misnamed, and I had <type>transmission_interface/SimpleTransmission</type> in my transmission tag instead of <type>transmission_interface/SimpleTransmission</type>.

If you are having a similar problem, note that gazebo_ros_control will segfault without a helpful error message if your transmission tags are wrong. I think it might be the same for other parts of the urdf too.

I fixed it.

It turns out the tranmission tags in my urdf were wrong. I had a couple joints misnamed, and I had <type>transmission_interface/SimpleTransmission</type><type>SimpleTransmission</type> in my transmission tag instead of <type>transmission_interface/SimpleTransmission</type>.

If you are having a similar problem, note that gazebo_ros_control will segfault without a helpful error message if your transmission tags are wrong. I think it might be the same for other parts of the urdf too.