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- There is an assumption un uORB that PX4_F_RDONLY is not 0. - But O_RDONLY is 0 on Linux. orb_exists passes 0 to px4_open, which in uORB::DeviceNode::open leads to an unnecessary allocation of SubscriberData() - PX4_F_RDONLY is only used in combination with px4_open, never with open() However even if it was wrong/unexpected, it did not cause any problems, just the unnecessary allocation.