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From: luca abeni <luca.abeni@santannapisa.it>
To: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Wander Lairson Costa <wander@redhat.com>,
	Valentin Schneider <vschneid@redhat.com>,
	Oleg Nesterov <oleg@redhat.com>, Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Stafford Horne <shorne@gmail.com>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Andy Lutomirski <luto@kernel.org>,
	"Liam R. Howlett" <Liam.Howlett@oracle.com>,
	Fenghua Yu <fenghua.yu@intel.com>,
	Andrei Vagin <avagin@gmail.com>,
	open list <linux-kernel@vger.kernel.org>,
	Paul McKenney <paulmck@kernel.org>
Subject: Re: [PATCH v2 1/4] sched/task: Add the put_task_struct_atomic_safe function
Date: Fri, 17 Feb 2023 20:04:37 +0100	[thread overview]
Message-ID: <20230217200437.551ad7c2@nowhere> (raw)
In-Reply-To: <8632d9c6-7ec7-c3aa-f9e7-fa63cc82f6ae@redhat.com>

Hi all,

On Fri, 17 Feb 2023 14:35:22 -0300
Daniel Bristot de Oliveira <bristot@redhat.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.


			Luca

  reply	other threads:[~2023-02-17 19:04 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-20 15:02 [PATCH v2 0/4] Fix put_task_struct() calls under PREEMPT_RT Wander Lairson Costa
2023-01-20 15:02 ` [PATCH v2 1/4] sched/task: Add the put_task_struct_atomic_safe function Wander Lairson Costa
2023-01-23 16:30   ` Oleg Nesterov
2023-01-23 16:49     ` Oleg Nesterov
2023-01-23 17:24     ` Wander Lairson Costa
2023-01-27 15:55       ` Valentin Schneider
2023-01-30 11:49         ` Wander Lairson Costa
2023-01-30 14:46           ` Valentin Schneider
2023-01-30 14:58             ` Wander Lairson Costa
2023-01-30 15:20               ` Valentin Schneider
2023-02-17 17:35           ` Daniel Bristot de Oliveira
2023-02-17 19:04             ` luca abeni [this message]
2023-02-22 18:42               ` Wander Lairson Costa
2023-02-22 21:00                 ` luca abeni
2023-02-24  8:46                   ` luca abeni
2023-02-24 13:02                     ` Wander Lairson Costa
2023-02-24 16:01                       ` luca abeni
2023-01-20 15:02 ` [PATCH v2 2/4] sched/deadline: fix inactive_task_timer splat Wander Lairson Costa
2023-01-20 15:02 ` [PATCH v2 3/4] sched/rt: use put_task_struct_atomic_safe() to avoid potential splat Wander Lairson Costa
2023-01-25  0:16   ` Steven Rostedt
2023-01-20 15:02 ` [PATCH v2 4/4] sched/core: " Wander Lairson Costa
2023-01-20 17:45 ` [PATCH v2 0/4] Fix put_task_struct() calls under PREEMPT_RT Valentin Schneider
2023-01-20 20:14   ` Wander Lairson Costa

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