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

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Message-ID: <683428c8.a70a0220.29d4a0.0802.GAE@google.com>
Date: Mon, 26 May 2025 01:39:36 -0700
From: syzbot <syzbot+9767c7ed68b95cfa69e6@...kaller.appspotmail.com>
To: andrii@...nel.org, davem@...emloft.net, edumazet@...gle.com, 
	horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, 
	tj@...nel.org, yangfeng@...inos.cn
Subject: [syzbot] [net?] WARNING: suspicious RCU usage in corrupted (3)

Hello,

syzbot found the following issue on:

HEAD commit:    079e5c56a5c4 bpf: Fix error return value in bpf_copy_from_..
git tree:       bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12739ad4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c6c517d2f439239
dashboard link: https://syzkaller.appspot.com/bug?extid=9767c7ed68b95cfa69e6
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=114915f4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15566170580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8d7d35d067bc/disk-079e5c56.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/74d2648ea7f4/vmlinux-079e5c56.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e751e253ee4f/bzImage-079e5c56.xz

The issue was bisected to:

commit ee971630f20fd421fffcdc4543731ebcb54ed6d0
Author: Feng Yang <yangfeng@...inos.cn>
Date:   Tue May 6 06:14:33 2025 +0000

    bpf: Allow some trace helpers for all prog types

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=130ddad4580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=108ddad4580000
console output: https://syzkaller.appspot.com/x/log.txt?x=170ddad4580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9767c7ed68b95cfa69e6@...kaller.appspotmail.com
Fixes: ee971630f20f ("bpf: Allow some trace helpers for all prog types")

=============================
WARNING: suspicious RCU usage
6.15.0-rc4-syzkaller-g079e5c56a5c4 #0 Not tainted
-----------------------------
net/core/netclassid_cgroup.c:24 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, 


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

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