linux-kernel - Re: [PATCH] coredump: Limit what can interrupt coredumps

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Message-ID: <20210614165920.GD13677@redhat.com>
Date:   Mon, 14 Jun 2021 18:59:21 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Olivier Langlois <olivier@...llion01.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        io-uring <io-uring@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>,
        "Pavel Begunkov>" <asml.silence@...il.com>
Subject: Re: [PATCH] coredump: Limit what can interrupt coredumps

On 06/14, Eric W. Biederman wrote:
>
> I would very much like some clarity on TIF_NOTIFY_SIGNAL.  At the very
> least it would be nice if it could get renamed TIF_NOTIFY_TASK_WORK.

No, no, no ;)

I think that, for example, freezer should be changed to use
set_notify_signal() rather than fake_signal_wake_up(). Livepatch.
And probably it will have more users.

> I don't understand the logic with well enough of adding work to
> non-io_uring threads with task_work_add to understand why that happens
> in the first place.

Same here.

Oleg.