Re: [PATCH stable] memcg: add refcnt for pcpu stock to avoid UAF problem in drain_all_stock()

On Wed 21-02-24 11:08:02, Michal Hocko wrote: [...]

You are right. Thanks! IRQ disabling is there in one form or the other since db2ba40c277d ("mm: memcontrol: make per-cpu charge cache IRQ-safe for socket accounting") so 4.8+ is safe. Backports to older kernels would nee to pull this one as well.

Scratch that. Prior to db2ba40c277d, we used to disable preemption via {get,put}_cpu_var and that should achive the same result.