linux-kernel - Re: [PATCH 1/1] exit: change the release_task() paths to call flush

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Message-ID: <87o6zen5se.ffs@tglx>
Date: Thu, 06 Feb 2025 22:04:49 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, "Eric W. Biederman"
 <ebiederm@...ssion.com>, Frederic Weisbecker <frederic@...nel.org>, Peter
 Zijlstra <peterz@...radead.org>, Mateusz Guzik <mjguzik@...il.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] exit: change the release_task() paths to call
 flush_sigqueue() lockless

Oleg!

On Thu, Feb 06 2025 at 17:23, Oleg Nesterov wrote:
> On 02/06, Thomas Gleixner wrote:
>> > 	- do_sigaction() can hit the similar problem
>>
>> Indeed, but that's a tough on to solve.
>
> Yeah... Although I have to admit that yesterday I had a very simple
> (and wrong) solution in mind ;)

I can relate. My initial "brilliant" idea to solve that turned out to be
broken after less than 10 seconds... :)

That needs some more thought to the whole signal handling business and
unfortunately the recent posix-timer changes do not help much in that
context. Let me think about it some more.

Thanks,

        tglx