linux-kernel - Re: [PATCH 2/2] eventpoll: Fix epoll

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Message-ID: <CAGudoHF8pKE3ODqY-WnbV=ZpjC9hH+U+COq_KE=aH7mEW8fsKQ@mail.gmail.com>
Date: Thu, 18 Sep 2025 00:38:25 +0200
From: Mateusz Guzik <mjguzik@...il.com>
To: Khazhy Kumykov <khazhy@...omium.org>
Cc: Nam Cao <namcao@...utronix.de>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, Shuah Khan <shuah@...nel.org>, 
	Davidlohr Bueso <dave@...olabs.net>, Soheil Hassas Yeganeh <soheil@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>, Eric Dumazet <edumazet@...gle.com>, Jens Axboe <axboe@...nel.dk>, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] eventpoll: Fix epoll_wait() report false negative

On Thu, Sep 18, 2025 at 12:34 AM Khazhy Kumykov <khazhy@...omium.org> wrote:
>
> On Wed, Sep 17, 2025 at 11:03 AM Khazhy Kumykov <khazhy@...omium.org> wrote:
> >
> > One ordering thing that sticks out to me is
> (ordering can't help here since we'll rapidly be flapping between
> ovflist in use and inactive... right)

a sequence counter around shenanigans will sort it out, but I don't
know if it is worth it and don't really want to investigate myself.