netdev - Re: [syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in bq_xmit

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Message-ID: <0000000000004257c7061daa3f20@google.com>
Date: Sat, 20 Jul 2024 02:15:03 -0700
From: syzbot <syzbot+707d98c8649695eaf329@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bigeasy@...utronix.de, 
	bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net, 
	eddyz87@...il.com, edumazet@...gle.com, haoluo@...gle.com, hawk@...nel.org, 
	jasowang@...hat.com, john.fastabend@...il.com, jolsa@...nel.org, 
	kpsingh@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	martin.lau@...ux.dev, netdev@...r.kernel.org, pabeni@...hat.com, 
	sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, 
	willemdebruijn.kernel@...il.com, yonghong.song@...ux.dev
Subject: Re: [syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in bq_xmit_all

syzbot has bisected this issue to:

commit fecef4cd42c689a200bdd39e6fffa71475904bc1
Author: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Date:   Thu Jul 4 14:48:15 2024 +0000

    tun: Assign missing bpf_net_context.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12ddc995980000
start commit:   720261cfc732 Merge tag 'bcachefs-2024-07-18.2' of https://..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11ddc995980000
console output: https://syzkaller.appspot.com/x/log.txt?x=16ddc995980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=93ca6cd6f392cb76
dashboard link: https://syzkaller.appspot.com/bug?extid=707d98c8649695eaf329
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1791eb49980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=118cf7a5980000

Reported-by: syzbot+707d98c8649695eaf329@...kaller.appspotmail.com
Fixes: fecef4cd42c6 ("tun: Assign missing bpf_net_context.")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection