Re: [V2][PATCH] cgroup: fix memory leak caused by missing cgroup_bpf_offline

[Michal Koutný]

On Wed, Oct 20, 2021 at 01:22:06PM +0800, Quanyang Wang <quanyang.wang@xxxxxxxxxxxxx> wrote:
> > If only precpu_ref data is leaked, it is fine to add "Fixes: 2b0d3d3e4fcf",
> > I thought cgroup_bpf_release() needs to release more for root cgroup, but
> > looks not true.
> For now, I can only observe that precpu_ref data is leaked when running ltp
> testsuite.

I assume you refer to ref->data. I considered the ref->percpu_count_ptr
allocated with __alloc_percpu_gfp(). Could it be that kmemleak won't
detect leaked percpu allocations?

(The patch you sent resolves this as well, I'm just curious.)

Michal