linux-kernel - Re: [RFC 2/3] futex: exit: Print a warning when futex

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Message-ID: <87r15qrwdt.ffs@tglx>
Date:   Thu, 21 Apr 2022 22:53:34 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Nico Pache <npache@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        André Almeida 
        <andrealmeid@...labora.com>, Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC 2/3] futex: exit: Print a warning when futex_cleanup fails

On Thu, Apr 21 2022 at 15:05, Nico Pache wrote:

> The futex_cleanup routines currently fails silently.
>
> Allow the futex_cleanup routines to fail more verbosely so we can
> leave a message behind for easier debugging/error detecting.

This is a free ticket to spam dmesg for any unpriviledged user.

> Fixes: 0771dfefc9e5 ("[PATCH] lightweight robust futexes: core")

There is nothing to fix, really.

Robust futexes are best effort as I explained you before and spamming
dmesg won't help anything.

Thanks,

        tglx