Re: [PATCH 6.12.y 0/2] sched/psi: fix race in pressure_write (CVE-2026-52991)

[Philo Lu]

On 7/17/26 9:37 AM, Sasha Levin wrote:

> I'm holding off on this series (and the 6.6.y/6.1.y ones) for now: a5b98009f16d
> moves the psi trigger write path under cgroup_mutex, which means the psimon
> kthread gets created while holding cgroup_mutex and introduces a deadlock risk.

Thanks for the heads-up, Sasha, and sorry I missed the patch you pointed 
out.

BTW, I have an unrelated question. I'd like to backport some stable 
patches to earlier LTS trees (e.g. from 6.18 down to 6.6). For patchsets 
like this one that apply cleanly to multiple versions (6.1, 6.6, and 
6.12), which of the following is preferred?

(1) A single patchset covering all three trees, with subjects like 
"[PATCH 6.1.y/6.6.y/6.12.y] ..."

(2) Three separate patchsets, one per stable tree.

Thanks.
--
Philo