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

[David Hildenbrand]

On 31.07.23 21:21, Lorenzo Stoakes wrote:
> On Mon, Jul 24, 2023 at 08:23:55AM +0200, 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?
> >
> > @Lorenzo do you plan on reproduce + fix, or should we consider reverting
> > that change?
> >
> > --
> > Cheers,
> >
> > David / dhildenb
>
> Apologies I mised this, I have been very busy lately not least with book :)
>
> Concerning, I will take a look as I get a chance. I think the whole series
> would have to be reverted which would be... depressing... as other patches
> in series eliminates the bounce buffer altogether.

I spotted

https://lkml.kernel.org/r/069dd40aa71e634b414d07039d72467d051fb486.camel@xxxxxx

today, maybe that's related.

--
Cheers,

David / dhildenb