Reproduced in production pod 2026-04-30: wgrib2 3.6.0 crashes with
`free(): invalid size` when -lon point extraction is run against any
HRDPS rotated lat/lon GRIB2 file, regardless of batch size (failed at
N=200, N=1000, N=2000). Output before the abort is denormal f32 garbage
(val=4.93944e-41) — wgrib2's internal record buffer is being corrupted.
Same files extract cleanly with wgrib2 3.8.0 locally. Bumping the build
arg in both Dockerfile (Elixir image, used by hrrr-point-rs/per-QSO
HRDPS lookups) and rust/prop_grid_rs/Dockerfile (Rust grid worker) so
both consumers get the fix.
Also bumped POINT_BATCH 200 → 1000 in decoder.rs. With wgrib2 3.8.0
stable at 1000+ point batches, this drops the chain-step invocation
count from 286 → 57 per step. Comment captures the reproduction
context so a future bisection finds it quickly.
Graham McIntire
89eccb7d50