netdev - Re: [syzbot] [bpf?] possible deadlock in __bpf_ringbuf

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Message-ID: <68b619bc.050a0220.3db4df.01c5.GAE@google.com>
Date: Mon, 01 Sep 2025 15:10:04 -0700
From: syzbot <syzbot+fa5c2814795b5adca240@...kaller.appspotmail.com>
To: alexei.starovoitov@...il.com, andrii@...nel.org, ast@...nel.org, 
	bpf@...r.kernel.org, daniel@...earbox.net, eddyz87@...il.com, 
	haoluo@...gle.com, hffilwlqm@...il.com, john.fastabend@...il.com, 
	jolsa@...nel.org, kpsingh@...nel.org, linux-kernel@...r.kernel.org, 
	martin.lau@...ux.dev, memxor@...il.com, netdev@...r.kernel.org, 
	sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, 
	yonghong.song@...ux.dev
Subject: Re: [syzbot] [bpf?] possible deadlock in __bpf_ringbuf_reserve (2)

syzbot has bisected this issue to:

commit 27861fc720be2c39b861d8bdfb68287f54de6855
Author: Kumar Kartikeya Dwivedi <memxor@...il.com>
Date:   Thu Aug 21 16:26:00 2025 +0000

    bpf: Drop rqspinlock usage in ringbuf

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=167eee34580000
start commit:   dd9de524183a xsk: Fix immature cq descriptor production
git tree:       bpf
final oops:     https://syzkaller.appspot.com/x/report.txt?x=157eee34580000
console output: https://syzkaller.appspot.com/x/log.txt?x=117eee34580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c321f33e4545e2a1
dashboard link: https://syzkaller.appspot.com/bug?extid=fa5c2814795b5adca240
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=142da862580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1588aef0580000

Reported-by: syzbot+fa5c2814795b5adca240@...kaller.appspotmail.com
Fixes: 27861fc720be ("bpf: Drop rqspinlock usage in ringbuf")

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