Check for double buffer submission via MMAL
@6by9 is already working on this.
Since Dec 21, 2017.
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Description
From https://github.com/raspberrypi/firmware/issues/377, MMAL queues go badly wrong if you submit the same buffer twice (circular references in a linked list).
Investigate sanity checking of queues and mmal_port_buffer_send (which uses a queue underneath) to try and protect the system from misbehaving apps.
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