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

From: Jakub Kicinski <[email-masked]>
Date: Mon, 6 Jan 2025 15:51:54 -0800

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.
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