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

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Message-ID: <CAADnVQ+cu2yt8v=8KE32Kymw_c-KLFUmbxZMxxjqBksafyNHiA@mail.gmail.com>
Date: Thu, 8 May 2025 11:00:15 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: syzbot <syzbot+9d95beb2a3c260622518@...kaller.appspotmail.com>
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>, elic@...dia.com, 
	Hao Luo <haoluo@...gle.com>, Hillf Danton <hdanton@...a.com>, Jason Wang <jasowang@...hat.com>, 
	John Fastabend <john.fastabend@...il.com>, Jiri Olsa <jolsa@...nel.org>, 
	Martin KaFai Lau <kafai@...com>, KP Singh <kpsingh@...nel.org>, LKML <linux-kernel@...r.kernel.org>, 
	linux-trace-kernel <linux-trace-kernel@...r.kernel.org>, kbuild test robot <lkp@...el.com>, 
	clang-built-linux <llvm@...ts.linux.dev>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Kumar Kartikeya Dwivedi <memxor@...il.com>, 
	Masami Hiramatsu <mhiramat@...nel.org>, michal.kukowski@...ogain.com, 
	Michal Switala <michal.switala@...ogain.com>, "Michael S. Tsirkin" <mst@...hat.com>, 
	Network Development <netdev@...r.kernel.org>, norbert.kaminski@...lobal.com, 
	norbert.kaminski@...ogain.com, norkam41@...il.com, 
	oe-kbuild-all@...ts.linux.dev, parav@...dia.com, 
	Steven Rostedt <rostedt@...dmis.org>, Stanislav Fomichev <sdf@...ichev.me>, 
	Stanislav Fomichev <sdf@...gle.com>, Song Liu <song@...nel.org>, Song Liu <songliubraving@...com>, 
	syzkaller-bugs <syzkaller-bugs@...glegroups.com>, 
	Wojciech Gładysz <wojciech.gladysz@...ogain.com>, 
	Yonghong Song <yhs@...com>, Yonghong Song <yonghong.song@...ux.dev>
Subject: Re: [syzbot] [bpf?] possible deadlock in trie_delete_elem

On Thu, May 8, 2025 at 12:13 AM syzbot
<syzbot+9d95beb2a3c260622518@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 47979314c0fe245ed54306e2f91b3f819c7c0f9f
> Author: Kumar Kartikeya Dwivedi <memxor@...il.com>
> Date:   Sun Mar 16 04:05:37 2025 +0000
>
>     bpf: Convert lpm_trie.c to rqspinlock
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=140598f4580000
> start commit:   c2933b2befe2 Merge tag 'net-6.14-rc1' of git://git.kernel...
> git tree:       net-next
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d033b14aeef39158
> dashboard link: https://syzkaller.appspot.com/bug?extid=9d95beb2a3c260622518
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=108e1724580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=177035f8580000
>
> If the result looks correct, please mark the issue as fixed by replying with:

yes.

#syz fix: bpf: Convert lpm_trie.c to rqspinlock