linux-kernel - Re: [PATCH v2] mm/slub: Avoid list corruption when removing a slab from the full list

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Message-ID: <49469e9f-ca42-4250-b949-66247f623c3d@suse.cz>
Date: Tue, 8 Oct 2024 11:17:51 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: "Christoph Lameter (Ampere)" <cl@...two.org>,
 Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc: "yuan.gao" <yuan.gao@...oud.cn>, penberg@...nel.org, rientjes@...gle.com,
 iamjoonsoo.kim@....com, akpm@...ux-foundation.org, roman.gushchin@...ux.dev,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/slub: Avoid list corruption when removing a slab
 from the full list

On 10/7/24 18:40, Christoph Lameter (Ampere) wrote:
> 
> list_del() in remove_partial() sets poison values for next/prev so there
> should no list
> corruption but a failure showing the poison values.

Yeah that's what is reported, but there's still a mention of list corruption:

[ 4277.385669] list_del corruption, ffffea00044b3e50->next is LIST_POISON1 (dead000000000100)
 
> static inline void list_del(struct list_head *entry)
> {
>         __list_del_entry(entry);
>         entry->next = LIST_POISON1;
>         entry->prev = LIST_POISON2;
> }
>