linux-kernel - Re: [PATCH bpf 2/4] selftests: bpf: ignore RST packets for reuseport tests

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Date:   Thu, 23 Jan 2020 21:53:51 +0000
From:   Martin Lau <kafai@...com>
To:     Lorenz Bauer <lmb@...udflare.com>
CC:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        Song Liu <songliubraving@...com>, "Yonghong Song" <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf 2/4] selftests: bpf: ignore RST packets for reuseport
 tests

On Thu, Jan 23, 2020 at 04:59:31PM +0000, Lorenz Bauer wrote:
> The reuseport tests currently suffer from a race condition: RST
> packets count towards DROP_ERR_SKB_DATA, since they don't contain
> a valid struct cmd. Tests will spuriously fail depending on whether
> check_results is called before or after the RST is processed.
> 
> Exit the BPF program early if FIN is set.
btw, it needs a Fixes tag.

Patch 4 and Patch 1 also need a Fixes tag.