linux-kernel - Re: [syzbot] [bpf?] WARNING in bpf_bprintf

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Message-ID: <20251028075218.aw9YABrW@linutronix.de>
Date: Tue, 28 Oct 2025 08:52:18 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Yonghong Song <yonghong.song@...ux.dev>
Cc: Sahil Chandna <chandna.sahil@...il.com>,
	syzbot+b0cff308140f79a9c4cb@...kaller.appspotmail.com,
	andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
	daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com,
	john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org,
	linux-kernel@...r.kernel.org, listout@...tout.xyz,
	martin.lau@...ux.dev, netdev@...r.kernel.org, sdf@...ichev.me,
	song@...nel.org, syzkaller-bugs@...glegroups.com,
	linux-rt-devel@...ts.linux.dev
Subject: Re: [syzbot] [bpf?] WARNING in bpf_bprintf_prepare (3)

On 2025-10-27 20:45:25 [-0700], Yonghong Song wrote:
> This should work, but local lock disable interrupts which could have
> negative side effects on the system. We don't want this.
> That is the reason we have 3 nested level for bpf_bprintf_buffers.
> 
> Please try my above preempt_disalbe/enable() solution.

I meant to look into this yesterday but got distracted with other
things. I try to take a look.

Sebastian