netdev - Re: [PATCH] mm: Decline to manipulate the refcount on a slab page

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Message-ID: <20250311111511.2531b260@kernel.org>
Date: Tue, 11 Mar 2025 11:15:11 +0100
From: Jakub Kicinski <kuba@...nel.org>
To: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
 Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org, Hannes Reinecke
 <hare@...e.de>
Subject: Re: [PATCH] mm: Decline to manipulate the refcount on a slab page

On Mon, 10 Mar 2025 14:35:24 +0000 Matthew Wilcox (Oracle) wrote:
> Long-term, networking needs to stop taking a refcount on the pages that
> it uses and rely on the caller to hold whatever references are necessary
> to make the memory stable. 

TBH I'm not clear on who is going to fix this.
IIRC we already told NVMe people that sending slab memory over sendpage 
is not well supported. Plus the bug is in BPF integration, judging by
the stack traces (skmsg is a BPF thing). Joy.