linux-kernel - [PATCH bpf-next] libbpf: Ignore the modules that failed to load BTF object

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Message-Id: <20251028135732.6489-1-cuibixuan@vivo.com>
Date: Tue, 28 Oct 2025 06:57:32 -0700
From: Bixuan Cui <cuibixuan@...o.com>
To: ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	cuibixuan@...o.com
Subject: [PATCH bpf-next] libbpf: Ignore the modules that failed to load BTF object

Register kfunc in self-developed module but run error in other modules:
    libbpf: btf: type [164451]: referenced type [164446] is not FUNC_PROTO
    libbpf: failed to load module [syscon_reboot_mode]'s BTF object #2: -22

It is usually skipping the error does not affect the search for the next module.

Then ignoring the failed modules, load the bpf process:
    libbpf: btf: type [164451]: referenced type [164446] is not FUNC_PROTO
    libbpf: failed to load module [syscon_reboot_mode]'s BTF object #3: -22
    libbpf: extern (func ksym) 'bpf_kfunc': resolved to bpf_module [164442]
    ...

Signed-off-by: Bixuan Cui <cuibixuan@...o.com>
---
 tools/lib/bpf/libbpf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 711173acbcef..0fa0d89da068 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -5702,7 +5702,8 @@ static int load_module_btfs(struct bpf_object *obj)
 		if (err) {
 			pr_warn("failed to load module [%s]'s BTF object #%d: %d\n",
 				name, id, err);
-			goto err_out;
+			close(fd);
+			continue;
 		}

 		err = libbpf_ensure_mem((void **)&obj->btf_modules, &obj->btf_module_cap,
--
2.39.0