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The stacktrace that you've posted is clearly not in your code. Therefore, this looks like a bug in the image transport library.

You should record a short bag file with the image topics in question, and verify that you can reproduce this issue by playing back the bag file with the example code running.

Once you're able to reproduce the issue with a small bag file and the sample program, you should open a ticket against the image_transport bug tracker. Be sure to include the versions of image_transport, ROS, OpenCV and Ubuntu that you're using.

Keeping the bag file small will make it quicker and easier for the package maintainer to download it and reproduce your issue.