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

David Hildenbrand
2023-07-31T19:25:46Z

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@gmx.de

today, maybe that's related.

--
Cheers,

David / dhildenb