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Thu, 12 Nov 2026 05:54:41 -0800 (PST) Received: from gmail.com ([2a03:2880:24ff:42::]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8b3933e0d01sm70407067b3.22.2026.11.12.05.54.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2026 05:54:40 -0800 (PST) Date: Thu, 12 Nov 2026 05:54:38 -0800 From: Breno Leitao To: Alan Maguire Cc: Yonghong Song , Alan Maguire , Arnaldo Carvalho de Melo , dwarves@vger.kernel.org, Alexei Starovoitov , Andrii Nakryiko , bpf@vger.kernel.org, kernel-team@fb.com Subject: Re: [PATCH dwarves] btf_encoder: Keep the source prototype of kfuncs Message-ID: References: <20261111222447.322978-1-yonghong.song@linux.dev> X-Mailing-List: bpf@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hello Alan, On Thu, Nov 12, 2026 at 12:36:29PM +0000, Alan Maguire wrote: > > Reported-by: Breno Leitao > > I'm having trouble reproducing the original failure; would you mind sharing > the config that reproduces it? I tried with clang 22, but no luck so far. This reproduces it on x86_64, with next-20261111, clang 22.1.3 and pahole master (9eb594d): # make LLVM=1 x86_64_defconfig # ./scripts/config -e BPF_SYSCALL -e BPF_JIT -e CGROUP_BPF \ -d DEBUG_INFO_NONE -e DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT \ -e DEBUG_INFO_BTF -e KCSAN -e UBSAN -e WERROR # make LLVM=1 olddefconfig # make LLVM=1 -j$(nproc) vmlinux [...] BTF .tmp_vmlinux1 WARN: resolve_btfids: no BTF func for kfunc bpf_tcp_ops_set_rcvlowat in bpf_tcp_ops_set_rcvlowat_kfunc_set WARN: resolve_btfids: unresolved symbol bpf_tcp_ops_set_rcvlowat Failed to generate BTF for vmlinux let me know if you are not able to, and I will send you my full .config Thanks, --breno