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Message-ID: <952b7626-9504-4bdd-b57c-8ad2465815ee@redhat.com>
Date: Tue, 14 Jan 2025 10:35:46 +0100
From: David Hildenbrand <david@...hat.com>
To: mawupeng <mawupeng1@...wei.com>, akpm@...ux-foundation.org,
 osalvador@...e.de, nao.horiguchi@...il.com, linmiaohe@...wei.com,
 mhocko@...e.com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm: memory_hotplug: add TTU_HWPOISON for poisoned
 folio during migrate

> We have faced a different race here as follow:
> 
> CPU#0			cpu #1
> 			offline_pages
> 			do_migrate_range
> memory_failure
> TestSetPageHWPoison
> 			// folio is mark poison here
> 			unmap_poisoned_folio // should kill task here
> ...
> hwpoison_user_mappings

Interesting; TestSetPageHWPoison is called before we grab the folio 
lock, so even grabbing that around unmap_poisoned_folio() cannot 
completely help.

-- 
Cheers,

David / dhildenb


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