linux-kernel - Re: [PATCH] mm/page_owner: fix a crash after memory offline

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Message-ID: <dbf95ea6-fe44-41c5-7f5a-a780e5ff42ba@redhat.com>
Date:   Fri, 11 Oct 2019 11:57:28 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Qian Cai <cai@....pw>, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "mhocko@...e.com" <mhocko@...e.com>
Subject: Re: [PATCH] mm/page_owner: fix a crash after memory offline

On 10.10.19 21:12, Qian Cai wrote:
> On Thu, 2019-10-10 at 20:55 +0200, David Hildenbrand wrote:
>> On 10.10.19 20:32, Qian Cai wrote:
>>> The linux-next series "mm/memory_hotplug: Shrink zones before removing
>>> memory" [1] seems make a crash easier to reproduce while reading
>>> /proc/pagetypeinfo after offlining a memory section. Fix it by using
>>> pfn_to_online_page() in the PFN walker.
>>
>> Can you please rephrase the subject+description to describe the actual
>> problem and drop the reference to the series?
> 
> I'd figure it is better for you to post this as you are on the top of this whole
> mess. What do you think?

You mean, I found the key to an unlimited amount of undetected BUGs, so 
I should fix them? ;)

In case you don't have time to explore all the dirty details, I can take 
it from here. Just let me know.

-- 

Thanks,

David / dhildenb