Re: KCSAN: data-race in cgroup_rstat_flush_locked / cgroup_rstat_updated

[Michal Koutný]

Hello Hao.

On Thu, Sep 16, 2021 at 09:53:55PM +0800, Hao Sun <sunhao.th@xxxxxxxxx> wrote:
> KCSAN reported the following data race during the kernel booting when
> using Healer to fuzz the latest Linux kernel.
> [...]
>  cgroup_rstat_cpu_pop_updated kernel/cgroup/rstat.c:139 [inline]
>  [...]
>  cgroup_rstat_updated+0x53/0x1b0 kernel/cgroup/rstat.c:38

FWIW, it's a "safe" race between updaters and flushers (possibly
missing the latest update(s)). This is expected as explained in
cgroup_rstat_updated() comment.

Michal