Re: [PATCH v8 1/4] fs/proc/kcore: avoid bounce buffer for ktext data

[Baoquan He]

On 07/24/23 at 08:23am, David Hildenbrand wrote:
> Hi,
> 
> > 
> > I met this too when I executed below command to trigger a kcore reading.
> > I wanted to do a simple testing during system running and got this.
> > 
> >    makedumpfile --mem-usage /proc/kcore
> > 
> > Later I tried your above objdump testing, it corrupted system too.
> > 
> 
> What do you mean with "corrupted system too" --  did it not only fail to
> dump the system, but also actually harmed the system?

>From my testing, reading kcore will cause system panic, then reboot. Not
sure if Jiri saw the same phenomenon.

> 
> @Lorenzo do you plan on reproduce + fix, or should we consider reverting
> that change?

When tested on a arm64 system, the reproducution is stable. I will have
a look too to see if I have some finding this week.