linux-kernel - Re: kdump kernel randomly hang with tick_periodic call trace on bare metal system

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Date:   Wed, 21 Dec 2022 12:46:51 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     x86@...nel.org, kexec@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: kdump kernel randomly hang with tick_periodic call trace on bare
 metal system

On 20/12/2022 02:51, Baoquan He wrote:
> On 12/20/22 at 01:41pm, Baoquan He wrote:
>> On one intel bare metal system, I can randomly reproduce the kdump hang
>> as below with tick_periodic call trace. Attach the kernel config for
>> reference.
> 
> Forgot mentioning this random hang is also caused by adding
> 'nr_cpus=2' into normal kernel's cmdline, then triggering crash will get
> kdump kernel hang as below kdump log shown.
> 

The weird thing is that you seem to be using "nr_cpus=1" instead - this
is the cmdline from the log:

"nr_cpus=2 irqpoll nr_cpus=1 reset_devices cgroup_disable=memory mce=off
numa=off udev.children-max=2 panic=10 acpi_no_memhotplug
transparent_hugepage=never nokaslr hest_disable novmcoredd cma=0
hugetlb_cma=0 disable_cpu_apicid=16 [...]"

You seems to pass twice the "nr_cpus" thing, and I guess kernel pick the
last one?

Also, what is "disable_cpu_apicid=16"? Could this be related?


Thanks for the report!
Cheers,


Guilherme