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: <20250611131241.6ff7cf5d@kernel.org>
Date: Wed, 11 Jun 2025 13:12:41 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Toke Høiland-Jørgensen <toke@...hat.com>, "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

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.