linux-kernel - Re: [PATCH v2] pid: annotate data-races around pid_ns->pid

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Message-ID: <7adb633683ed40587a379260857c7a48ce69638c@linux.dev>
Date: Mon, 28 Apr 2025 08:30:24 +0000
From: "Jiayuan Chen" <jiayuan.chen@...ux.dev>
To: "Michal Koutný" <mkoutny@...e.com>
Cc: linux-kernel@...r.kernel.org, mrpre@....com,
 syzbot+adcaa842b762a1762e7d@...kaller.appspotmail.com,
 syzbot+fab52e3459fa2f95df57@...kaller.appspotmail.com,
 syzbot+0718f65353d72efaac1e@...kaller.appspotmail.com, "Andrew Morton"
 <akpm@...ux-foundation.org>, "Christian Brauner" <brauner@...nel.org>,
 "Lorenzo Stoakes" <lorenzo.stoakes@...cle.com>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, "Suren Baghdasaryan" <surenb@...gle.com>, "Wei
 Yang" <richard.weiyang@...il.com>, "David Hildenbrand"
 <david@...hat.com>, "Al Viro" <viro@...iv.linux.org.uk>, "Mateusz Guzik"
 <mjguzik@...il.com>, "Oleg Nesterov" <oleg@...hat.com>, "Joel Granados"
 <joel.granados@...nel.org>, "Bill O'Donnell" <bodonnel@...hat.com>,
 "Darrick J. Wong" <djwong@...nel.org>, "Frederic Weisbecker"
 <frederic@...nel.org>
Subject: Re: [PATCH v2] pid: annotate data-races around pid_ns->pid_allocated

April 25, 2025 at 17:25, "Michal Koutný" <mkoutny@...e.com> wrote:

> 
> On Fri, Apr 25, 2025 at 01:58:14PM +0800, Jiayuan Chen <jiayuan.chen@...ux.dev> wrote:
> 
> > 
> > Suppress syzbot reports by annotating these accesses using data_race().
> > 
> 
> Thanks for trying this approach.
> 
> scripts/checkpatch.pl has quite some remarks about the current form :-)
> 
> I mean, the data_race annotation should document why the race is
> 
> harmless. I only glanced over this so I can't tell myself whether it's a
> 
> bug or OK.
> 
> > 
> > Reported-by: syzbot+adcaa842b762a1762e7d@...kaller.appspotmail.com
> > 
> >  Reported-by: syzbot+fab52e3459fa2f95df57@...kaller.appspotmail.com
> > 
> >  Reported-by: syzbot+0718f65353d72efaac1e@...kaller.appspotmail.com
> > 
> 
> How can I get to see full syzbot reports? (Stacktrace would be helpful,
> 
> I cannot resolve those as message-ids on (LK)ML.)
> 
> Thanks,
> 
> Michal
>

Hi Michal,

We can find such reports at https://syzkaller.appspot.com/upstream/s/kernel