linux-kernel - Re: [PATCH] mm/memory-failure: fix deadlock when hugetlb_optimize

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Date: Tue, 9 Apr 2024 16:10:22 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Miaohe Lin <linmiaohe@...wei.com>
Cc: akpm@...ux-foundation.org, naoya.horiguchi@....com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/memory-failure: fix deadlock when
 hugetlb_optimize_vmemmap is enabled

On Sun, Apr 07, 2024 at 04:54:56PM +0800, Miaohe Lin wrote:
> In short, below scene breaks the lock dependency chain:
> 
>  memory_failure
>   __page_handle_poison
>    zone_pcp_disable -- lock(pcp_batch_high_lock)
>    dissolve_free_huge_page
>     __hugetlb_vmemmap_restore_folio
>      static_key_slow_dec
>       cpus_read_lock -- rlock(cpu_hotplug_lock)
> 
> Fix this by calling drain_all_pages() instead.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Acked-by: Oscar Salvador <osalvador@...e.de>

Thanks!


-- 
Oscar Salvador
SUSE Labs