netdev - Re: [syzbot] [net?] WARNING: suspicious RCU usage in corrupted (3)

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Message-ID: <87h5x4obbt.fsf@posteo.net>
Date: Sun, 14 Sep 2025 23:37:15 +0000
From: Charalampos Mitrodimas <charmitro@...teo.net>
To: syzbot <syzbot+9767c7ed68b95cfa69e6@...kaller.appspotmail.com>
Cc: alexei.starovoitov@...il.com,  andrii@...nel.org,  ast@...nel.org,
  bpf@...r.kernel.org,  daniel@...earbox.net,  davem@...emloft.net,
  eddyz87@...il.com,  edumazet@...gle.com,  haoluo@...gle.com,
  horms@...nel.org,  jiayuan.chen@...ux.dev,  john.fastabend@...il.com,
  jolsa@...nel.org,  kpsingh@...nel.org,  kuba@...nel.org,
  linux-kernel@...r.kernel.org,  linux-kselftest@...r.kernel.org,
  martin.lau@...ux.dev,  mykolal@...com,  netdev@...r.kernel.org,
  pabeni@...hat.com,  sdf@...ichev.me,  shuah@...nel.org,  song@...nel.org,
  syzkaller-bugs@...glegroups.com,  tj@...nel.org,  yangfeng@...inos.cn,
  yonghong.song@...ux.dev
Subject: Re: [syzbot] [net?] WARNING: suspicious RCU usage in corrupted (3)

syzbot <syzbot+9767c7ed68b95cfa69e6@...kaller.appspotmail.com> writes:

> syzbot suspects this issue was fixed by commit:
>
> commit 7f12c33850482521c961c5c15a50ebe9b9a88d1e
> Author: Charalampos Mitrodimas <charmitro@...teo.net>
> Date:   Wed Jun 11 17:20:43 2025 +0000
>
>     net, bpf: Fix RCU usage in task_cls_state() for BPF programs
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13745562580000
> start commit:   079e5c56a5c4 bpf: Fix error return value in bpf_copy_from_..
> git tree:       bpf-next
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c6c517d2f439239
> dashboard link: https://syzkaller.appspot.com/bug?extid=9767c7ed68b95cfa69e6
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=114915f4580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15566170580000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: net, bpf: Fix RCU usage in task_cls_state() for BPF programs

Correct, also did test-run to make sure.

#syz fix: net, bpf: Fix RCU usage in task_cls_state() for BPF programs

C. Mitrodimas

>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection