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Message-ID: <20230222184237.hkfznxm3ts3gye2i@fedora>
Date: Wed, 22 Feb 2023 15:42:37 -0300
From: Wander Lairson Costa <wander@...hat.com>
To: luca abeni <luca.abeni@...tannapisa.it>
Cc: Daniel Bristot de Oliveira <bristot@...hat.com>,
Valentin Schneider <vschneid@...hat.com>,
Oleg Nesterov <oleg@...hat.com>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Stafford Horne <shorne@...il.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Andy Lutomirski <luto@...nel.org>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Andrei Vagin <avagin@...il.com>,
open list <linux-kernel@...r.kernel.org>,
Paul McKenney <paulmck@...nel.org>
Subject: Re: [PATCH v2 1/4] sched/task: Add the put_task_struct_atomic_safe
function
On Fri, Feb 17, 2023 at 08:04:37PM +0100, luca abeni wrote:
> Hi all,
>
> On Fri, 17 Feb 2023 14:35:22 -0300
> Daniel Bristot de Oliveira <bristot@...hat.com> wrote:
>
> > On 1/30/23 08:49, Wander Lairson Costa wrote:
> > >> Another thing, if you look at release_task_stack(), it either
> > >> caches the outgoing stack for later use, or frees it via RCU
> > >> (regardless of PREEMPT_RT). Perhaps we could follow that and just
> > >> always punt the freeing of the task struct to RCU?
> > >>
> > > That's a point. Do you mean doing that even for !PREEMPT_RT?
> > >
> >
> > It seems that Luca Abeni (in Cc) is hitting the bug in the non-rt
> > kernel with SCHED_DEADLINE...
> >
> > adding him to the thread.
>
> Thanks Daniel for adding me.
>
> I triggered this "BUG: Invalid wait context" with a 5.15.76 kernel,
> without PREEMPT_RT. I can reproduce it easily on a KVM-based VM; if
> more information or tests are needed, let me know.
>
Does it happen in linux-6.1 or linux-6.2?
>
> Luca
>
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