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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id m12-20020a1709026bcc00b00186a2274382sm3941752plt.76.2023.06.21.14.44.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jun 2023 14:44:44 -0700 (PDT) Date: Wed, 21 Jun 2023 14:44:44 -0700 From: Kees Cook To: kernel test robot Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, Linux Memory Management List , "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org, Nick Desaulniers Subject: Re: [linux-next:master 2819/11071] fs/ceph/addr.c:794:12: warning: stack frame size (2096) exceeds limit (2048) in 'ceph_writepages_start' Message-ID: <202306211444.EEB1506@keescook> References: <202306210637.TpfYq9gM-lkp@intel.com> <202306211437.EDDEDA582@keescook> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202306211437.EDDEDA582@keescook> X-Rspamd-Queue-Id: 433441C0005 X-Rspam-User: X-Stat-Signature: ohcihagit31bjef3nhe6eymt7skd8633 X-Rspamd-Server: rspam01 X-HE-Tag: 1687383886-790605 X-HE-Meta: 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 RaHS8piw 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Jun 21, 2023 at 02:39:39PM -0700, Kees Cook wrote: > On Wed, Jun 21, 2023 at 06:56:36AM +0800, kernel test robot wrote: > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > > head: 9dbf40840551df336c95ce2a3adbdd25ed53c0ef > > commit: df8fc4e934c12b906d08050d7779f292b9c5c6b5 [2819/11071] kbuild: Enable -fstrict-flex-arrays=3 > > This looks very much like: > https://lore.kernel.org/all/202306100035.VTusNhm4-lkp@intel.com/ > > > config: riscv-randconfig-r004-20230620 (https://download.01.org/0day-ci/archive/20230621/202306210637.TpfYq9gM-lkp@intel.com/config) > > compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07) > > reproduce: (https://download.01.org/0day-ci/archive/20230621/202306210637.TpfYq9gM-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/202306210637.TpfYq9gM-lkp@intel.com/ > > > > All warnings (new ones prefixed by >>): > > > > >> fs/ceph/addr.c:794:12: warning: stack frame size (2096) exceeds limit (2048) in 'ceph_writepages_start' [-Wframe-larger-than] > > static int ceph_writepages_start(struct address_space *mapping, > > ^ > > 1820/2096 (86.83%) spills, 276/2096 (13.17%) variables > > 1 warning generated. > > This appears to be a clang stack slot reuse issue. It continues to be > investigated. We're currently tracking it here, though we may need to split the bug up: https://github.com/ClangBuiltLinux/linux/issues/39 -- Kees Cook