linux-kernel - Re: [syzbot] [net?] kernel BUG in fib6_add

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Message-ID: <e3ff455b-1c02-4f3b-9b57-1a9c7d5bd5fb@kernel.org>
Date: Thu, 8 Jan 2026 17:56:41 -0700
From: David Ahern <dsahern@...nel.org>
To: syzbot <syzbot+cb809def1baaac68ab92@...kaller.appspotmail.com>,
 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
Subject: Re: [syzbot] [net?] kernel BUG in fib6_add_rt2node (2)

On 1/6/26 10:58 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    1d528e794f3d Merge branch 'bpf-fix-bpf_d_path-helper-proto..
> git tree:       bpf
> console output: https://syzkaller.appspot.com/x/log.txt?x=159c51c2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9e5198eaf003f1d1

This config at

commit 59ba823e689f832f389ea6af6e7ae5842b3c860a (HEAD -> net-next,
net-next/main)
Merge: 76de4e1594b7 f2a3b12b305c
Author: Jakub Kicinski <kuba@...nel.org>
Date:   Thu Jan 8 11:37:07 2026 -0800

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

> dashboard link: https://syzkaller.appspot.com/bug?extid=cb809def1baaac68ab92
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=139c51c2580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11b2961a580000

and this reproducer does not show a problem for me.