Re: [PATCH net] vxlan: use one headroom snapshot for neighbour replies

[Sanghyun Park]

Thanks for the review, Paolo.

> if you can observe a splat on the unpatched kernel, please include it,
> otherwise please explain why the issue is not just a theoretical one.

I thought it would make the changelog verbose by putting the evidences of the
bugs (some people like concise changelogs).

If you prefer splats in there, let me add some in v2.

It would be like:

```
/* vxlan_na_create() samples ... */

The race is reproducible on the unpatched kernel. It occurred when
vxlan_na_create() generated a neighbour reply while vxlan_changelink() changed
the link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte
skbuff_small_head allocation.

/* Snapshot the headroom once ... */
```

JFYI, every patch I make is done only after I get real evidence :)

> Also please specify if some LLM has been used.

I used LLM assistance during bug discovery, analysis, etc, but try to review
with my eyes as much as I can.


Plz check the new paragraph of the changelog whether it is ok for v2.

Thanks,
Sanghyun