Follow-up datapoint: on 2026-07-13 I downgraded all nine of my trixie machines to 3.13.5-2+deb13u2 (via snapshot.debian.org, apt-mark hold). Since then my seven weewxd instances have completed 145 of the explicit 3-hourly gc.collect() passes that previously triggered the crashes, with zero segfaults. On deb13u3 the same fleet crashed on roughly 3-4% of these passes (4 crashes over ~2 days), so approximately five crashes would have been expected in those 145 passes had we stayed on deb13u3. This further confirms the regression is confined to deb13u3.
Is a deb13u4 adding gh-130555 (d567f451e157) planned? I'm happy to test a candidate package on this fleet before upload. I'd also like to stop holding at deb13u2, since that means running without deb13u3's security fixes. John Kline
