linux-kernel - Re: [PATCH] sched: Consider task_struct::saved_state in wait_task

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230329133337._HFnQR5R@linutronix.de>
Date:   Wed, 29 Mar 2023 15:33:37 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Mel Gorman <mgorman@...e.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Valentin Schneider <vschneid@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH] sched: Consider task_struct::saved_state in
 wait_task_inactive().

On 2023-02-23 17:53:48 [+0100], To Peter Zijlstra wrote:
> On 2023-02-22 14:36:14 [+0100], Peter Zijlstra wrote:
> > Which if the very few wait_task_inactive() users requires this?
> 
> ptrace is the remaining (known) one (just verified on v6.2-rt3).
> ptrace_check_attach() waits for the child which blocks on tasklist_lock.
> 
> tglx argued that wait_task_inactive() should work regardless of the
> task, that is being waited for, blocks on a sleeping lock.

a polite ping.

Sebastian