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

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Message-ID: <fo436hdqzkevk7jqszyprjjwehqge7rrqxz6gqbmgoqqsqwdxl@efe2r5jeouwl>
Date: Fri, 25 Apr 2025 11:25:07 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Jiayuan Chen <jiayuan.chen@...ux.dev>
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

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

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