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Date: Thu, 31 Oct 2024 10:57:31 +0100
From: Frederic Weisbecker <frederic@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Naresh Kamboju <naresh.kamboju@linaro.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	open list <linux-kernel@vger.kernel.org>,
	lkft-triage@lists.linaro.org,
	Linux Regressions <regressions@lists.linux.dev>,
	rcu <rcu@vger.kernel.org>, linux-clk <linux-clk@vger.kernel.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Dan Carpenter <dan.carpenter@linaro.org>,
	Anna-Maria Behnsen <anna-maria@linutronix.de>,
	Mark Brown <broonie@kernel.org>,
	Alex =?iso-8859-1?Q?Benn=E9e?= <alex.bennee@linaro.org>,
	Peter Maydell <peter.maydell@linaro.org>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Anders Roxell <anders.roxell@linaro.org>,
	Aishwarya TCV <aishwarya.tcv@arm.com>
Subject: Re: next-20241031: kernel/time/clockevents.c:455
 clockevents_register_device
Message-ID: <ZyNUi/DmVi8P21TA@lothringen>
References: <CA+G9fYtb5vAnEiHupwsnaeZ7uzdko_WAcjw9ZAFkHNXBVhi1EA@mail.gmail.com>
 <87zfmkwqui.ffs@tglx>
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In-Reply-To: <87zfmkwqui.ffs@tglx>

On Thu, Oct 31, 2024 at 10:42:45AM +0100, Thomas Gleixner wrote:
> On Thu, Oct 31 2024 at 14:10, Naresh Kamboju wrote:
> > The QEMU-ARM64 boot has failed with the Linux next-20241031 tag.
> > The boot log shows warnings at clockevents_register_device and followed
> > by rcu_preempt detected stalls.
> >
> > However, the system did not proceed far enough to reach the login prompt.
> > The fvp-aemva, Qemu-arm64, Qemu-armv7 and Qemu-riscv64 boot failed.
> >
> > Please find the incomplete boot log links below for your reference.
> > The Qemu version is 9.0.2.
> > <4>[ 0.220657] WARNING: CPU: 1 PID: 0 at kernel/time/clockevents.c:455
> > clockevents_register_device (kernel/time/clockevents.c:455
> > <4>[ 0.225218] clockevents_register_device+0x170/0x188 P
> > <4>[ 0.225367] clockevents_config_and_register+0x34/0x50 L
> > <4>[ 0.225487] clockevents_config_and_register (kernel/time/clockevents.c:523)
> > <4>[ 0.225553] arch_timer_starting_cpu
> > (drivers/clocksource/arm_arch_timer.c:1034)
> > <4>[ 0.225602] cpuhp_invoke_callback (kernel/cpu.c:194)
> > <4>[ 0.225649] __cpuhp_invoke_callback_range (kernel/cpu.c:965)
> > <4>[ 0.225691] notify_cpu_starting (kernel/cpu.c:1604)
> 
> That's obvious what happens here. notify_cpu_starting() is invoked
> before the CPU is marked online, which triggers the new check in
> clockevents_register_device().
> 
> I removed the warning and force pushed the fixed up branch, so that
> should be gone by tomorrow.

Ah, phew!

Thanks.

> 
> Thanks,
> 
>         tglx
>