[PATCH 6.6.y 0/2] jbd2: backport CVE-2026-89566, CVE-2026-89567

[Artem Dinaburg]

Hi Greg, Sasha, and maintainers,

I'm working through the smaller CVE backports still missing from 6.6.y.
These 2 upstream changes belong together for CVE-2026-89566,
CVE-2026-89567. They must be applied in this order because the later change
depends on or completes the earlier one.

The complete series is already present in 6.12.y, 6.18.y, and 7.2.y.
These fixes also affect 6.1.y, which will need a separate backport; this
series is only for 6.6.y.

Could you please consider this series for 6.6.y?

Thanks,
Artem Dinaburg

Series:
  1. jbd2: check need_resched() when skipping busy checkpoint buffers
  2. jbd2: bound shrinker scans by examined checkpoint buffers

base: v6.6.157 (79643295eba17affbd16ca97f3ef04c90266b28c) plus stable-queue
revision 958ddf240a33ef26b1771be944f0ea6c3b597472