linux-kernel - Re: futex+io_uring: futex_q::task can maybe be dangling (but is not actually accessed, so it's fine)

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Message-ID: <f86765f7-80ee-4247-ae65-70638366dbb7@kernel.dk>
Date: Wed, 15 Jan 2025 10:07:34 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Thomas Gleixner <tglx@...utronix.de>,
 Peter Zijlstra <peterz@...radead.org>
Cc: Jann Horn <jannh@...gle.com>, Ingo Molnar <mingo@...hat.com>,
 Darren Hart <dvhart@...radead.org>, Davidlohr Bueso <dave@...olabs.net>,
 André Almeida <andrealmeid@...lia.com>,
 kernel list <linux-kernel@...r.kernel.org>,
 Pavel Begunkov <asml.silence@...il.com>, io-uring <io-uring@...r.kernel.org>
Subject: Re: futex+io_uring: futex_q::task can maybe be dangling (but is not
 actually accessed, so it's fine)

On 1/15/25 10:05 AM, Thomas Gleixner wrote:
> On Wed, Jan 15 2025 at 08:32, Jens Axboe wrote:
>> Here's the raw patch. Should've done this initially rather than just
>> tackle __futex_queue(), for some reason I thought/assumed that
>> futex_queue() was more widely used.
> 
> 'git grep' is pretty useful to validate such assumptions :)

It would not be a good assumption if it was backed by fact checking ;-)

>> What do you think?
> 
> Looks about right.

OK thanks, fwiw I did send it out as a proper patch as well.

-- 
Jens Axboe