Subject: Re: [PATCH net] net: sched: gred: prevent races when adding offloads to stats

From: Cong Wang <[email-masked]>
Date: Sat, 14 Jan 2023 18:20:29 -0800

On Thu, Jan 12, 2023 at 08:41:37PM -0800, Jakub Kicinski wrote:
> Naresh reports seeing a warning that gred is calling
> u64_stats_update_begin() with preemption enabled.
> Arnd points out it's coming from _bstats_update().

The stack trace looks confusing to me without further decoding.

Are you sure we use sch->qstats/bstats in __dev_queue_xmit() there
not any netdev stats? It may be a false positive one as they may end up
with the same lockdep class.

Thanks.