linux-kernel - Re: [PATCH bpf-next v2] net: Fix RCU usage in task_cls

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Message-Id: 
 <174965763351.3384611.4699133562202888154.git-patchwork-notify@kernel.org>
Date: Wed, 11 Jun 2025 16:00:33 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Charalampos Mitrodimas <charmitro@...teo.net>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, martin.lau@...ux.dev,
 daniel@...earbox.net, john.fastabend@...il.com, ast@...nel.org,
 andrii@...nel.org, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, jolsa@...nel.org, yangfeng@...inos.cn, tj@...nel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 syzbot+b4169a1cfb945d2ed0ec@...kaller.appspotmail.com
Subject: Re: [PATCH bpf-next v2] net: Fix RCU usage in task_cls_state() for
 BPF
 programs

Hello:

This patch was applied to bpf/bpf-next.git (net)
by Daniel Borkmann <daniel@...earbox.net>:

On Wed, 11 Jun 2025 09:04:06 +0000 you wrote:
> The commit ee971630f20f ("bpf: Allow some trace helpers for all prog
> types") made bpf_get_cgroup_classid_curr helper available to all BPF
> program types, not just networking programs.
> 
> This helper calls __task_get_classid() which internally calls
> task_cls_state() requiring rcu_read_lock_bh_held(). This works in
> networking/tc context where RCU BH is held, but triggers an RCU
> warning when called from other contexts like BPF syscall programs that
> run under rcu_read_lock_trace():
> 
> [...]

Here is the summary with links:
  - [bpf-next,v2] net: Fix RCU usage in task_cls_state() for BPF programs
    https://git.kernel.org/bpf/bpf-next/c/bdcaef7b8815

You are awesome, thank you!
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