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Cc: zhuhui@kylinos.cn,geliang@kernel.org,ast@kernel.org,andrii@kernel.org,daniel@iogearbox.net,martin.lau@kernel.org,eddyz87@gmail.com,yonghong.song@linux.dev,clm@meta.com,ihor.solodrai@linux.dev
Subject: Re: [RFC PATCH bpf-next v3 11/12] selftests/bpf: Add test for memcg_bpf_ops hierarchies
Date: Fri, 23 Jan 2026 09:18:57 +0000 (UTC) [thread overview]
Message-ID: <806d3538bf542f23b9b89c35199996f195e82b2cdde50c40ca8478cbbe6af3fb@mail.kernel.org> (raw)
In-Reply-To: <db8b80a445a61b437c35c71ec2edb573002656fc.1769157382.git.zhuhui@kylinos.cn>
[-- Attachment #1: Type: text/plain, Size: 1810 bytes --]
> diff --git a/tools/testing/selftests/bpf/prog_tests/memcg_ops.c b/tools/testing/selftests/bpf/prog_tests/memcg_ops.c
> index 9a8d16296f2d..bab9f3094f59 100644
> --- a/tools/testing/selftests/bpf/prog_tests/memcg_ops.c
> +++ b/tools/testing/selftests/bpf/prog_tests/memcg_ops.c
[ ... ]
> +void test_memcg_ops_hierarchies(void)
> +{
> + int ret, first = -1, second = -1, third = -1;
> + struct memcg_ops *skel;
> + struct bpf_map *map;
> + struct bpf_link *link1 = NULL, *link2 = NULL, *link3 = NULL;
[ ... ]
> + opts.relative_fd = second;
> + opts.flags = 0;
> + link2 = bpf_map__attach_struct_ops_opts(map, &opts);
> + if (!ASSERT_OK_PTR(link2, "bpf_map__attach_struct_ops_opts"))
> + goto cleanup;
> +
> + opts.relative_fd = third;
> + opts.flags = 0;
> + link2 = bpf_map__attach_struct_ops_opts(map, &opts);
> + if (!ASSERT_ERR_PTR(link3, "bpf_map__attach_struct_ops_opts"))
^^^^^
The result of the third bpf_map__attach_struct_ops_opts() call is stored in
link2, but the assertion checks link3. Since link3 is initialized to NULL
and never modified, the ASSERT_ERR_PTR check does not validate the actual
return value of the third attachment.
Should this be assigning to link3 instead of link2?
> + goto cleanup;
> +
> +cleanup:
> + bpf_link__destroy(link1);
> + bpf_link__destroy(link2);
If the fix is to use link3 for the third attachment result, should
bpf_link__destroy(link3) be added here as well?
> + memcg_ops__detach(skel);
> + close(first);
> + close(second);
> + close(third);
> + cleanup_cgroup_environment();
> +}
---
AI reviewed your patch. Please fix the bug or email reply why it's not a bug.
See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md
CI run summary: https://github.com/kernel-patches/bpf/actions/runs/21280790825
next prev parent reply other threads:[~2026-01-23 9:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-23 8:55 [RFC PATCH bpf-next v3 00/12] mm: memcontrol: Add BPF hooks for memory controller Hui Zhu
2026-01-23 8:55 ` [RFC PATCH bpf-next v3 01/12] bpf: move bpf_struct_ops_link into bpf.h Hui Zhu
2026-01-23 8:55 ` [RFC PATCH bpf-next v3 02/12] bpf: initial support for attaching struct ops to cgroups Hui Zhu
2026-01-23 9:19 ` bot+bpf-ci
2026-01-23 8:55 ` [RFC PATCH bpf-next v3 03/12] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL Hui Zhu
2026-01-23 8:57 ` [RFC PATCH bpf-next v3 04/12] mm: define mem_cgroup_get_from_ino() outside of CONFIG_SHRINKER_DEBUG Hui Zhu
2026-01-23 8:57 ` [RFC PATCH bpf-next v3 05/12] libbpf: introduce bpf_map__attach_struct_ops_opts() Hui Zhu
2026-01-23 9:19 ` bot+bpf-ci
2026-01-23 8:58 ` [RFC PATCH bpf-next v3 06/12] bpf: Pass flags in bpf_link_create for struct_ops Hui Zhu
2026-01-23 8:58 ` [RFC PATCH bpf-next v3 07/12] libbpf: Support passing user-defined flags " Hui Zhu
2026-01-23 9:00 ` [RFC PATCH bpf-next v3 08/12] mm: memcontrol: Add BPF struct_ops for memory controller Hui Zhu
2026-01-23 9:29 ` bot+bpf-ci
2026-01-23 9:00 ` [RFC PATCH bpf-next v3 09/12] selftests/bpf: Add tests for memcg_bpf_ops Hui Zhu
2026-01-23 9:19 ` bot+bpf-ci
2026-01-23 20:47 ` JP Kobryn
2026-01-26 1:40 ` hui.zhu
2026-01-23 9:00 ` [RFC PATCH bpf-next v3 10/12] mm/bpf: Add BPF_F_ALLOW_OVERRIDE support " Hui Zhu
2026-01-23 9:29 ` bot+bpf-ci
2026-01-23 9:01 ` [RFC PATCH bpf-next v3 11/12] selftests/bpf: Add test for memcg_bpf_ops hierarchies Hui Zhu
2026-01-23 9:18 ` bot+bpf-ci [this message]
2026-01-23 9:01 ` [RFC PATCH bpf-next v3 12/12] samples/bpf: Add memcg priority control example Hui Zhu
2026-01-23 9:18 ` bot+bpf-ci
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