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This is the root cause of https://github.com/PX4/Firmware/issues/9461 The _pins array was initialized to -1. It was used to index the _gpios array. The value at _gpios[-1] was a number that mapped to Analog mode on Port A pin 0. These is the UART4_TX pin and was being reconfigured by the fault in the camera_trigger to an alaog input.