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I posted a similar issue here: http://answers.ros.org/question/52326/arm-architecture-with-armhf-port-move_base-bus-error-alignment-trapexception/

From the several issues that relate to this same problem, it seems like the problem is in the de-/serialization code!

There is still no real solutions to fix this bug on armhf ARM platforms. Things seem to work fine on armel.

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