From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CCA2810E2 for ; Wed, 28 Sep 2022 13:42:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A6A6C433D7; Wed, 28 Sep 2022 13:42:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1664372576; bh=/iKcJivJb+y9MGnSn6pzj30hZHdLRHEgppfL+ufJBXQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Ubid8OXh5qId+Qr1iedznL1NRQjXJeUeBK1ypqbYcXWau9yKNyLlo77BjiHZ0dsDA iGqPpoHsf6LBnnfXjXNZr+SBwpT9vNZSr7PChnnvsSg1FN7LY0eAgdnT6jpK5lh99Y l/yAFW6SMDCm6Canylc1UAwrqWG0Q2zuu6w3orJr/UX/a+JprvItR6R0MLEEiJ/okd HVusQrnyF3Edzba7U0PP8U4DU7kmO7efGzB2t3U4fJqL9C5srHB76TgLd9sMiL6AfQ Du8Yk5t5k/LqG9M3ADK9l0SAIOmpK5GeNL0o9es09ayGErSxlwNU69i3Jc6XiKYqnP BEhSvbYN+MDEw== Received: by quaco.ghostprotocols.net (Postfix, from userid 1000) id 66148405F0; Wed, 28 Sep 2022 10:42:53 -0300 (-03) Date: Wed, 28 Sep 2022 10:42:53 -0300 From: Arnaldo Carvalho de Melo To: Nathan Chancellor Cc: Nick Desaulniers , dwarves@vger.kernel.org, llvm@lists.linux.dev Subject: Re: die__process_unit: DW_TAG_label (0xa) @ <0x7b> not handled! Message-ID: References: Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Url: http://acmel.wordpress.com Em Tue, Sep 27, 2022 at 12:59:03PM -0700, Nathan Chancellor escreveu: > On Tue, Sep 27, 2022 at 04:08:02PM -0300, Arnaldo Carvalho de Melo wrote: > > Em Tue, Sep 27, 2022 at 11:56:34AM -0700, Nathan Chancellor escreveu: > > > Hi Arnaldo, > > > > > > When building a kernel with LLVM and CONFIG_DEBUG_INFO_BTF after commit > > > 32ef9e5054ec ("Makefile.debug: re-enable debug info for .S files") in > > > the kernel, I see the following spew of warnings, which appear to come > > > from pahole: > > > > > > $ clang --version > > > clang version 15.0.0 (Fedora 15.0.0-3.fc38) > > > Target: x86_64-redhat-linux-gnu > > > Thread model: posix > > > InstalledDir: /usr/bin > > > > > > $ pahole --version > > > v1.24 > > > > > > $ make -skj"$(nproc)" ARCH=x86_64 LLVM=1 defconfig > > > > > > $ scripts/config \ > > > -d DEBUG_INFO_NONE \ > > > -e BPF_SYSCALL \ > > > -e DEBUG_INFO_BTF \ > > > -e DEBUG_INFO_DWARF5 > > > > > > $ make -skj"$(nproc)" ARCH=x86_64 LLVM=1 olddefconfig all > > > ... > > > die__process_unit: DW_TAG_label (0xa) @ <0x7b> not handled! > > > die__process_unit: tag not supported 0xa (label)! > > > die__process_unit: DW_TAG_label (0xa) @ <0x97> not handled! > > > die__process_unit: DW_TAG_label (0xa) @ <0xbd> not handled! > > > die__process_unit: DW_TAG_label (0xa) @ <0xed> not handled! > > > die__process_unit: DW_TAG_label (0xa) @ <0x109> not handled! > > > die__process_unit: DW_TAG_label (0xa) @ <0x12a> not handled! > > > die__process_unit: DW_TAG_label (0xa) @ <0x146> not handled! > > > die__process_unit: DW_TAG_label (0xa) @ <0x16f> not handled! > > > ... > > > > > > Is this a problem with LLVM or pahole? I do not see this when building > > > with GCC + GNU as but that could just be a red herring. I assume that > > > there could be something missing for processing debug info from > > > assembly, perhaps? If there is any further information I can provide or > > > anything I can test, I am more than happy to do so. > > > > I'll try to repro, but at first sight it looks like a label in a > > If you need help reproducing this locally, feel free to reach out > through this thread or #clangbuiltlinux on Libera. Can you please provide the vmlinux file where this takes place? > > DW_TAG_compile_unit/like level, I have to check what that means, but > > seems to be just a warning, did the end result made sense? > > Right, this appears to just be a warning, the build still completes > successfully (I did not check much else). I only noticed this by > scrolling back in my build logs. Ok. - Arnaldo