linux-kernel - Re: [syzbot] [bpf?] possible deadlock in bpf_lru_push

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Message-ID: <CAADnVQK8Viv9DTtfSQTm8T4Nuy2zoUyqRvhqTtzZWNc3By2Xpg@mail.gmail.com>
Date: Fri, 14 Nov 2025 18:36:33 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Menglong Dong <menglong.dong@...ux.dev>
Cc: Andrii Nakryiko <andrii@...nel.org>, Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Eduard <eddyz87@...il.com>, Hao Luo <haoluo@...gle.com>, 
	John Fastabend <john.fastabend@...il.com>, Jiri Olsa <jolsa@...nel.org>, 
	KP Singh <kpsingh@...nel.org>, LKML <linux-kernel@...r.kernel.org>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, Network Development <netdev@...r.kernel.org>, 
	Stanislav Fomichev <sdf@...ichev.me>, Song Liu <song@...nel.org>, 
	syzkaller-bugs <syzkaller-bugs@...glegroups.com>, Yonghong Song <yonghong.song@...ux.dev>, 
	syzbot <syzbot+18b26edb69b2e19f3b33@...kaller.appspotmail.com>
Subject: Re: [syzbot] [bpf?] possible deadlock in bpf_lru_push_free (2)

On Thu, Nov 13, 2025 at 11:08 PM Menglong Dong <menglong.dong@...ux.dev> wrote:
>
>
> Hmm...I have not figure out a good idea, and maybe we can
> use some transaction process here. Is there anyone else
> that working on this issue?

yeah. it's not easy. rqspinlock is not a drop-in replacement.
But before we move any further, can you actually reproduce?
I tried the repro.c with lockdep, kasan and all other debug configs
and it doesn't repro.
Maybe it was fixed already by nokprobe-ing lru, but syzbot didn't notice.