Re: [PATCH net] wireguard: peer: free packets left on the per-peer queues on removal

[Andrii Pasichnyk]

On Sat, 3 Oct 2026 20:19:40 +0000 netdev-bot wrote:
> - How the issue was discovered, e.g. hit in production, hit during
> development, syzbot report, manual code inspection, LLM or static
> analysis tool scan.

It was found by an LLM-assisted review of the peer removal path, while
I was working on a WireGuard change for single-CPU systems; it was not
hit in production. I then checked the mechanism by hand against
__napi_poll() and the WireGuard history, and confirmed it with a stress
test in the WireGuard selftest VM: remove a peer while a UDP flood keeps
its receive queue busy, re-add it, repeat, then run the selftest's
created/destroyed object check. Unpatched net-next leaked a peer and its
keypair 5 times in 2140 removals; with the patch, 0 times in another
2140.

Thanks,
Andrii