linux-kernel - Re: [syzbot] [cgroups?] possible deadlock in console_lock_spinning

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Message-ID: <6pdxz7oqr6442cczbec7n3cqtldrrpfsdk7ynqjguiqp6d5ucv@sibkx2lfldvu>
Date: Tue, 21 Jan 2025 19:29:48 +0100
From: Michal Koutný <mkoutny@...e.com>
To: syzbot <syzbot+622acb507894a48b2ce9@...kaller.appspotmail.com>
Cc: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	cgroups@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net, elic@...dia.com, 
	gregkh@...uxfoundation.org, hannes@...xchg.org, hawk@...nel.org, jasowang@...hat.com, 
	jirislaby@...nel.org, john.fastabend@...il.com, kafai@...com, kpsingh@...nel.org, 
	kuba@...nel.org, len.brown@...el.com, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, linux-serial@...r.kernel.org, mingo@...hat.com, mst@...hat.com, 
	netdev@...r.kernel.org, parav@...dia.com, pavel@....cz, rafael@...nel.org, 
	rostedt@...dmis.org, songliubraving@...com, syzkaller-bugs@...glegroups.com, 
	tj@...nel.org, yhs@...com
Subject: Re: [syzbot] [cgroups?] possible deadlock in
 console_lock_spinning_enable (5)

On Fri, Jan 17, 2025 at 04:34:03AM -0800, syzbot <syzbot+622acb507894a48b2ce9@...kaller.appspotmail.com> wrote:
> syzbot has bisected this issue to:
> 
> commit bc0d90ee021f1baecd6aaa010d787eb373aa74dd
> Author: Parav Pandit <parav@...dia.com>
> Date:   Tue Jan 5 10:32:02 2021 +0000
> 
>     vdpa: Enable user to query vdpa device info
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1440c2b0580000

syzbot got this somehow wrong, it started with the lockdep bug but then
switched to a different
| crash: BUG: unable to handle kernel paging request in bpf_trace_run3
so the bisecting session yielded (I believe) random commit, didn't it?

(The lockdep appears valid, with PSI enabled and the fault injection at
unfortunate place (with BPF'd tracepoint).)

Michal

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