linux-kernel - Re: [PATCH bpf-next 16/18] selftests/bpf: add checks for bpf_wq_set

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Date: Wed, 17 Apr 2024 20:25:20 -0700
From: Song Liu <song@...nel.org>
To: Benjamin Tissoires <bentiss@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, Yonghong Song <yonghong.song@...ux.dev>, 
	John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, 
	Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, bpf@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next 16/18] selftests/bpf: add checks for bpf_wq_set_callback()

On Tue, Apr 16, 2024 at 7:11 AM Benjamin Tissoires <bentiss@...nel.org> wrote:
[...]

> +SEC("?tc")
> +__log_level(2)
> +__failure
> +/* check that the first argument of bpf_wq_set_callback()
> + * is a correct bpf_wq pointer.
> + */
> +__msg("mark_precise: frame0: regs=r1 stack= before")

This line and some other "mark_precise" lines are causing issues for
test_progs-no_alu32 in the CI. I can reproduce it in my local tests.

I am not quite sure what is the best fix. Maybe we can just
remove it.

Thanks,
Song

> +__msg(": (85) call bpf_wq_set_callback_impl#") /* anchor message */
> +__msg("off 1 doesn't point to 'struct bpf_wq' that is at 0")
> +long test_wrong_wq_pointer_offset(void *ctx)
> +{
> +       int key = 0;
> +       struct bpf_wq *wq;
> +
> +       wq = bpf_map_lookup_elem(&array, &key);
> +       if (!wq)
> +               return 1;
> +
> +       if (bpf_wq_init(wq, &array, 0))
> +               return 2;
> +
> +       if (bpf_wq_set_callback((void *)wq + 1, wq_cb_sleepable, 0))
> +               return 3;
> +
> +       return -22;
> +}
>
> --
> 2.44.0
>