linux-kernel - Re: Kernel Panic sysrq questions

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Message-ID: <fddea111-4188-b14e-8f8e-f79de50ef9c9@infradead.org>
Date:   Mon, 18 Sep 2017 15:35:36 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Sriram V <vshrirama@...il.com>, linux-kernel@...r.kernel.org,
        Tejun Heo <tj@...nel.org>
Subject: Re: Kernel Panic sysrq questions

On 08/18/17 08:40, Sriram V wrote:
> Hi,
> 
> 1. I am testing my watchdog driver. The driver uses the internal
> watchdog (Internal to SOC).
> 2. I use a single core SOC.
> 3. I have a workqueue which pets the watchdog every 60 seconds.
> 4. I trigger a kernel crash by doing a echo c > /proc/sysrq-trigger to
> trigger  a kernel crash
> 5. Even after the crash, I observe that the workqueue gets
> periodically executed. (I have a printk
>     inside the workqueue before the pet as a result the watchdog does
> not reset the board.
> 
> My Understanding is When a fatal panic happens, The Kernel is in
> frozen state (no workques
> or tasks get executed).
> 
> Is my understanding correct or am i missing something here.

Hi,
What kernel version?

I don't see anything in the wq docs about that specific point.

Tejun?


-- 
~Randy