Re: next-20241031: kernel/time/clockevents.c:455 clockevents_register_device

[Frederic Weisbecker <frederic@kernel.org>]

Hi,

On Thu, Oct 31, 2024 at 02:10:14PM +0530, 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.
> 
> This is always reproducible.
> First seen on Linux next-20241031 tag.
>   Good: next-20241030
>   Good: next-20241031
> 
> qemu-arm64:
>   boot:
>     * clang-19-lkftconfig
>     * gcc-13-lkftconfig
>     * clang-nightly-lkftconfig
> 
> qemu-armv7:
>   boot:
>     * clang-19-lkftconfig
>     * gcc-13-lkftconfig
>     * clang-nightly-lkftconfig
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> 
> Boot log:
> -------
> [    0.000000] Booting Linux on physical CPU 0x0000000000 [0x000f0510]
>     0.000000] Linux version 6.12.0-rc5-next-20241031 (tuxmake@tuxmake)
> (aarch64-linux-gnu-gcc (Debian 13.3.0-5) 13.3.0, GNU ld (GNU Binutils
> for Debian) 2.43.1) #1 SMP PREEMPT @1730356841
> [    0.000000] KASLR enabled
> [    0.000000] random: crng init done
> [    0.000000] Machine model: linux,dummy-virt
> <trim>
> <6>[    0.216503] GICv3: CPU1: found redistributor 1 region 0:0x00000000080c0000
> <6>[    0.218511] GICv3: CPU1: using allocated LPI pending table
> @0x0000000100250000
> <4>[    0.220528] ------------[ cut here ]------------
> <4>[ 0.220657] WARNING: CPU: 1 PID: 0 at kernel/time/clockevents.c:455
> clockevents_register_device (kernel/time/clockevents.c:455

It's possible that I messed up something with clockevents.

Can you try to reproduce with:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
	timers/core

And if so it's possible that the bad commit is somewhere between:

    17a8945f369c (clockevents: Improve clockevents_notify_released() comment)

and

    bf9a001fb8e4 (clocksource/drivers/timer-tegra: Remove clockevents shutdown call on offlining)

I wish I could reproduce on my own but I don't have easy
access to such hardware.

Thanks.