netdev - Re: [PATCH net-next v6 0/8] fix two bugs related to page

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Message-ID: <20250106155154.7c349c67@kernel.org>
Date: Mon, 6 Jan 2025 15:51:54 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Yunsheng Lin <linyunsheng@...wei.com>
Cc: <davem@...emloft.net>, <pabeni@...hat.com>, <liuyonglong@...wei.com>,
 <fanghaiqing@...wei.com>, <zhangkun09@...wei.com>, Alexander Lobakin
 <aleksander.lobakin@...el.com>, Robin Murphy <robin.murphy@....com>,
 Alexander Duyck <alexander.duyck@...il.com>, Andrew Morton
 <akpm@...ux-foundation.org>, IOMMU <iommu@...ts.linux.dev>, MM
 <linux-mm@...ck.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, John
 Fastabend <john.fastabend@...il.com>, Matthias Brugger
 <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, <netdev@...r.kernel.org>,
 <intel-wired-lan@...ts.osuosl.org>, <bpf@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
 <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH net-next v6 0/8] fix two bugs related to page_pool

On Mon, 6 Jan 2025 21:01:08 +0800 Yunsheng Lin wrote:
> This patchset fix a possible time window problem for page_pool and
> the dma API misuse problem as mentioned in [1], and try to avoid the
> overhead of the fixing using some optimization.
> 
> From the below performance data, the overhead is not so obvious
> due to performance variations for time_bench_page_pool01_fast_path()
> and time_bench_page_pool02_ptr_ring, and there is about 20ns overhead
> for time_bench_page_pool03_slow() for fixing the bug.

This appears to make the selftest from the drivers/net target implode.

[   20.227775][  T218] BUG: KASAN: use-after-free in page_pool_item_uninit+0x100/0x130

Running the ping.py tests should be enough to repro.
-- 
pw-bot: cr