From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (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 A15E619F12A; Wed, 11 Dec 2024 09:49:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733910586; cv=none; b=NMfrtc/erzR9jPmC6jdEZpHG2rdb0MoOks+SvDpLKom6HSJRyaLJaC1ICsoFWO5ucwj3PggJAHp55rfQkuiF4UKjLX8YNHUEZ3NQt/4xOYUvOHeVvoWqHV6bbPF91PybVnmRM7HTrPxnhheS1Z8LoIgyAHEpX6bXkJ5jFzQbLcQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733910586; c=relaxed/simple; bh=Mu33YblOXzk38XPlVgibBT01SRKJ7fkjSx4p0sUTn7A=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=SE6Sja5ykOmkRq++XG1ph0BiXrYEHcsLGevwBr01/cPk2tCHB1mZsrTHWu7dMmn9+pqQDW6gg18H7n1XTXNK/PKuP5RWI9L9TVni9ogcIJXr5DpK+wGsfWdpOZxOnt7tlq49Yx/tb9x+f/o7R+V0EDwN0lRoWbQIfEWyr9wJLY4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Oh+JIrg8; arc=none smtp.client-ip=192.198.163.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Oh+JIrg8" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1733910584; x=1765446584; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=Mu33YblOXzk38XPlVgibBT01SRKJ7fkjSx4p0sUTn7A=; b=Oh+JIrg8+Lheg2axTZM6JDPQ5u90lPs8ZqMU7D/cH1VL+vB6peQU+53w SnbPV4cPDEe4gHp2CxzHPQmnURwAscU6E4N0opiAU+ZcU0Y3nCjpB0ADK nRix7aLhc14Ldmis/5ZYy+mB3m78iz/93rnWmRj0b7f9rbsRvWDmN4u/O ADQmcq6AbKp9vYTBtsoG5lYVRkWbV+RQsu4QGbKm/8+bbVgQw9qG4U6xi eZlg71zcjf9DQTN6DDZnod2OQGkAZmVWq80AvlOJbARzQWjLF+VZq1CaU gZuPzAFVPScWJp8+pOeXtmYC8k+4v8jWqBVI21jPLstal8e/CDfUdvIs9 g==; X-CSE-ConnectionGUID: fCETeV9yT3+wZouT1FiuNQ== X-CSE-MsgGUID: RTqKdhqVTWqV8Yg0TqMw8Q== X-IronPort-AV: E=McAfee;i="6700,10204,11282"; a="34184854" X-IronPort-AV: E=Sophos;i="6.12,225,1728975600"; d="scan'208";a="34184854" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Dec 2024 01:49:44 -0800 X-CSE-ConnectionGUID: 1kNx2+FNRe+AgiXSTrzX9w== X-CSE-MsgGUID: M5BPJqpJRLi9kV3j2LV+eQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="100684071" Received: from lkp-server01.sh.intel.com (HELO 82a3f569d0cb) ([10.239.97.150]) by orviesa005.jf.intel.com with ESMTP; 11 Dec 2024 01:49:39 -0800 Received: from kbuild by 82a3f569d0cb with local (Exim 4.96) (envelope-from ) id 1tLJLc-0006Vh-1n; Wed, 11 Dec 2024 09:49:36 +0000 Date: Wed, 11 Dec 2024 17:48:41 +0800 From: kernel test robot To: Rong Tao , andrii.nakryiko@gmail.com, qmo@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, rongtao@cestc.cn Cc: oe-kbuild-all@lists.linux.dev, Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , "(open list:BPF (bpftool))" , linux-kernel@vger.kernel.org Subject: Re: [PATCH bpf-next v4 1/2] bpftool: Fix gen object segfault Message-ID: <202412111714.9jJxt9x6-lkp@intel.com> 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=us-ascii Content-Disposition: inline In-Reply-To: Hi Rong, kernel test robot noticed the following build warnings: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Rong-Tao/libbpf-linker-Avoid-using-object-file-as-both-input-and-output/20241206-100435 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/tencent_B497E42A7CAF94A35B88EB060E42A2593408%40qq.com patch subject: [PATCH bpf-next v4 1/2] bpftool: Fix gen object segfault compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241211/202412111714.9jJxt9x6-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202412111714.9jJxt9x6-lkp@intel.com/ Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): PERF_VERSION = 6.13.rc1.g228582f448e8 gen.c: In function 'do_object': >> gen.c:1927:9: warning: 'linker' may be used uninitialized [-Wmaybe-uninitialized] 1927 | bpf_linker__free(linker); | ^~~~~~~~~~~~~~~~~~~~~~~~ gen.c:1879:28: note: 'linker' was declared here 1879 | struct bpf_linker *linker; | ^~~~~~ -- gen.c: In function 'do_object': >> gen.c:1927:9: warning: 'linker' may be used uninitialized [-Wmaybe-uninitialized] 1927 | bpf_linker__free(linker); | ^~~~~~~~~~~~~~~~~~~~~~~~ gen.c:1879:28: note: 'linker' was declared here 1879 | struct bpf_linker *linker; | ^~~~~~ gen.c: In function 'do_object': >> gen.c:1927:9: warning: 'linker' may be used uninitialized [-Wmaybe-uninitialized] 1927 | bpf_linker__free(linker); | ^~~~~~~~~~~~~~~~~~~~~~~~ gen.c:1879:28: note: 'linker' was declared here 1879 | struct bpf_linker *linker; | ^~~~~~ gen.c: In function 'do_object': >> gen.c:1927:9: warning: 'linker' may be used uninitialized [-Wmaybe-uninitialized] 1927 | bpf_linker__free(linker); | ^~~~~~~~~~~~~~~~~~~~~~~~ gen.c:1879:28: note: 'linker' was declared here 1879 | struct bpf_linker *linker; | ^~~~~~ -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki