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Fri, 11 Sep 2026 17:47:22 -0700 (PDT) Received: from nugod-NUC15CRHU5.tail9f095a.ts.net ([218.237.104.87]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc4c6572ecasm1800565a12.22.2026.09.11.17.47.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2026 17:47:21 -0700 (PDT) From: HyeongJun An To: =?UTF-8?q?Ricardo=20B=20=2E=20Marli=C3=A8re?= Cc: bpf@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Martin KaFai Lau , Emil Tsalapatis , Mykola Lysenko , Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH bpf-next] selftests/bpf: Tolerate libarena skeleton failures under BPF_STRICT_BUILD=0 Date: Sat, 12 Sep 2026 09:47:15 +0900 Message-ID: <20260912004716.2042864-1-sammiee5311@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On Fri Sep 11, 2026 at 03:02:35PM -0300, Ricardo B. Marlière (SUSE) wrote: > Under which circumstances does this happen to you? I missed this because I > was using defconfig + DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT + DEBUG_INFO_BTF + > BPF_SYSCALL + BPF_JIT Building against the distro kernel's BTF rather than one from the tree. On Ubuntu 6.17, /sys/kernel/btf/vmlinux carries no bpf_kfunc DECL_TAGs, so the vmlinux.h generated from it has 5 __ksym declarations where a tree-built kernel gives 269, and all six libarena BPF sources fail on undeclared bpf_preempt_disable, bpf_preempt_enable and bpf_stream_vprintk. It seems that is why you did not run into it with a kernel you built yourself. Thanks for the ack. I checked what the two bots raised and they are both right, including the Fixes: tag, so the patch needs more work than this. HyeongJun