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Mon, 09 Nov 2026 04:33:42 -0800 (PST) Received: from gmail.com ([2a03:2880:24ff:49::]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-67c3b93be27sm3766906d50.11.2026.11.09.04.33.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 04:33:41 -0800 (PST) Date: Mon, 9 Nov 2026 04:33:40 -0800 From: Breno Leitao To: Kuniyuki Iwashima Cc: Jiayuan Chen , acme@kernel.org, netdev@vger.kernel.org, llvm@lists.linux.dev, ast@kernel.org, yonghong.song@linux.dev, bpf@vger.kernel.org, kuba@kernel.org, tj@kernel.org Subject: Re: [BUG] bpf: tcp: bpf_tcp_ops_set_rcvlowat() missing from BTF with clang KCSAN Message-ID: References: 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: On Fri, Nov 06, 2026 at 07:05:25PM +0000, Kuniyuki Iwashima wrote: > On Fri, 06 Nov 2026 07:58:01 -0800, Breno Leitao wrote: > > On Fri, Nov 06, 2026 at 09:16:24PM +0800, Jiayuan Chen wrote: > > > Thanks for the report ! > > > > > > > > > On 11/6/26 7:38 PM, Breno Leitao wrote: > > > > My arm64 KCSAN builds of linux-next fail since next-20261015, because > > > > bpf_tcp_ops_set_rcvlowat() is missing from the vmlinux BTF: > > > > > > > > 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 > > > > Try to disable CONFIG_DEBUG_INFO_BTF > > > > make[4]: *** [scripts/Makefile.vmlinux:72: vmlinux.unstripped] Error 1 > > > > > > > > > > > > Has pahole fixed this issue? > > > > I don't think so, see the line below: > > Could you try this ? Thanks, it fixes my build. I tested it on top of pahole master (9eb594d) with next-20261105 and clang 22.1.3: - arm64 KCSAN, CONFIG_WERROR=y: vmlinux links again, bpf_tcp_ops_set_rcvlowat() is back in BTF, __bpf_tcp_ops_init() returns 0, and progs/tcp_autolowat.c from the selftests loads. - It also brings back scx_bpf_tid_to_task() that was work arounded by tejun. Feel free to add my "Tested-by: Breno Leitao " tag. --breno