linux-kernel - Re: [BUG REPORT]net: page_pool: kernel crash at iommu_get_dma

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Message-ID: <20240820074340.6de9282d@kernel.org>
Date: Tue, 20 Aug 2024 07:43:40 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Mina Almasry <almasrymina@...gle.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>, Robin Murphy <robin.murphy@....com>,
 Yunsheng Lin <linyunsheng@...wei.com>, Somnath Kotur
 <somnath.kotur@...adcom.com>, Jesper Dangaard Brouer <hawk@...nel.org>,
 Yonglong Liu <liuyonglong@...wei.com>, "David S. Miller"
 <davem@...emloft.net>, pabeni@...hat.com, ilias.apalodimas@...aro.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Alexander Duyck
 <alexander.duyck@...il.com>, Alexei Starovoitov <ast@...nel.org>, "shenjian
 (K)" <shenjian15@...wei.com>, Salil Mehta <salil.mehta@...wei.com>,
 joro@...tes.org, will@...nel.org, iommu@...ts.linux.dev
Subject: Re: [BUG REPORT]net: page_pool: kernel crash at
 iommu_get_dma_domain+0xc/0x20

On Tue, 20 Aug 2024 09:22:39 -0400 Mina Almasry wrote:
> Is it for some reason not feasible for the page_pool to release the
> pages on driver unload and destroy itself, rather than have to stick
> around until all pending pages have been returned from the net stack?

Normal page pool does not track all the pages it allocates.