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From: Jonas Jelonek <jelonek.jonas@gmail.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Huacai Chen <chenhuacai@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	linux-mips@vger.kernel.org, Clark Williams <clrkwllms@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Thomas Gleixner <tglx@kernel.org>,
	Jiayuan Chen <jiayuan.chen@linux.dev>,
	linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Subject: Re: [PATCH v2] MIPS: smp: report dying CPU to RCU in stop_this_cpu()
Date: Fri, 19 Jun 2026 09:53:20 +0200	[thread overview]
Message-ID: <7130ff1c-7c6e-4a82-868b-7f6c60c98e7d@gmail.com> (raw)
In-Reply-To: <20260619074323.IIq-0qan@linutronix.de>

Hi,

On 19.06.26 09:43, Sebastian Andrzej Siewior wrote:
> On 2026-06-08 09:37:29 [+0000], Jonas Jelonek wrote:
>> smp_send_stop() parks all secondary CPUs in stop_this_cpu(). The function
>> marks the CPU offline for the scheduler via set_cpu_online(false) but
>> never informs RCU, so RCU keeps expecting a quiescent state from CPUs
>> that are now spinning forever with interrupts disabled.
> …
>> Fixes: 91840be8f710 ("irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT")
>> CC: stable@vger.kernel.org
>> Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
> Sorry for being late.
>
> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>
> Sebastian

Thanks to both of you. The patch has been accepted and merged already
(silently) [1]. But I appreciate your reviews a lot.

Best,
Jonas

[1] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=9f3f3bdc6d9dac1a5a8262ee7ad0f2ff1527a7e7

      reply	other threads:[~2026-06-19  7:53 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-08  9:37 Jonas Jelonek
2026-06-10  6:05 ` Huacai Chen
2026-06-15  7:00   ` Jonas Jelonek
2026-06-15  7:09     ` Huacai Chen
2026-06-15  7:16       ` Jonas Jelonek
2026-06-15  7:30         ` Huacai Chen
2026-06-15  7:40           ` Jonas Jelonek
2026-06-19  7:14             ` Huacai Chen
2026-06-19  7:43 ` Sebastian Andrzej Siewior
2026-06-19  7:53   ` Jonas Jelonek [this message]

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