netdev - Re: [syzbot] [bpf?] WARNING: refcount bug in __add_used

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Message-ID: <6984550a.050a0220.3b3015.001b.GAE@google.com>
Date: Thu, 05 Feb 2026 00:30:02 -0800
From: syzbot <syzbot+5a0f1995634f7c1dadbf@...kaller.appspotmail.com>
To: a.s.protopopov@...il.com, alexei.starovoitov@...il.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, martin.lau@...ux.dev, 
	netdev@...r.kernel.org, sdf@...ichev.me, song@...nel.org, 
	syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev
Subject: Re: [syzbot] [bpf?] WARNING: refcount bug in __add_used_btf

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+5a0f1995634f7c1dadbf@...kaller.appspotmail.com
Tested-by: syzbot+5a0f1995634f7c1dadbf@...kaller.appspotmail.com

Tested on:

commit:         ea7bf7f2 bpf: Fix a potential use-after-free
git tree:       https://github.com/aspsk/bpf-next.git fix-btf-refcount
console output: https://syzkaller.appspot.com/x/log.txt?x=150eda5a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b5a1ee0109784fc2
dashboard link: https://syzkaller.appspot.com/bug?extid=5a0f1995634f7c1dadbf
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.