netdev - Re: [PATCH net-next v9 2/2] page_pool: Track DMA-mapped pages and unmap them when destroying the pool

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Message-ID: <87jz5hbevp.fsf@toke.dk>
Date: Thu, 12 Jun 2025 09:25:30 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Jakub Kicinski <kuba@...nel.org>, Breno Leitao <leitao@...ian.org>
Cc: "David S. Miller" <davem@...emloft.net>, Jesper Dangaard Brouer
 <hawk@...nel.org>, Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky
 <leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>, Andrew Lunn
 <andrew+netdev@...n.ch>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, Simon
 Horman <horms@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Mina
 Almasry <almasrymina@...gle.com>, Yonglong Liu <liuyonglong@...wei.com>,
 Yunsheng Lin <linyunsheng@...wei.com>, Pavel Begunkov
 <asml.silence@...il.com>, Matthew Wilcox <willy@...radead.org>,
 netdev@...r.kernel.org, bpf@...r.kernel.org, linux-rdma@...r.kernel.org,
 linux-mm@...ck.org, Qiuling Ren <qren@...hat.com>, Yuying Ma
 <yuma@...hat.com>, gregkh@...uxfoundation.org, sashal@...nel.org
Subject: Re: [PATCH net-next v9 2/2] page_pool: Track DMA-mapped pages and
 unmap them when destroying the pool

Jakub Kicinski <kuba@...nel.org> writes:

> On Wed, 11 Jun 2025 09:35:45 -0700 Breno Leitao wrote:
>> On Wed, Apr 09, 2025 at 12:41:37PM +0200, Toke Høiland-Jørgensen wrote:
>> > Fixes: ff7d6b27f894 ("page_pool: refurbish version of page_pool code")  
>> 
>> Do you have plan to backport this fix to LTS kernels? I am getting some
>> of these crashes on older kernel, and I am curious if there are plans to
>> backport this to LTS kernels.
>
> I think it's worth disclosing that the crashes we see are in error
> recovery on unstable HW. My vote would be to keep this out of stable
> until it reaches at least one final release.

Hmm, okay, guess we should ask Sasha to drop these, then?

https://lore.kernel.org/r/20250610122811.1567780-1-sashal@kernel.org
https://lore.kernel.org/r/20250610120306.1543986-1-sashal@kernel.org

-Toke