Re: Kernel Panic sysrq questions

From: Randy Dunlap
Date: Mon Sep 18 2017 - 18:35:44 EST

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.

What kernel version?

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