ASan

You built your GStreamer plugin with -fsanitize=address and gst-launch-1.0 says the element doesn’t exist. The runtime has to be in the process before anything else. One LD_PRELOAD fixes it, and one repeated -D flag quietly turns ASan off in colcon builds.

Everything I learned contributing 6 PRs to PX4-Autopilot in a single session — from Docker-based builds and sanitizer workflows, through uXRCE-DDS session debugging and MAVLink signing analysis, to SITL integration testing. Real bugs, real fixes, real build output.