tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.10 head: 900aea7691ecf9b39e819be55f95a940c75cc3ac commit: 36c5708fe6f882433a4915efa46f05ad58b52eb3 [48/49] arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.10 git checkout 36c5708fe6f882433a4915efa46f05ad58b52eb3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 1706 | } | ^ vim +1706 arch/arm64/kernel/cpufeature.c 8ef8f360cf30be Dave Martin 2020-03-16 1695 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1696 #ifdef CONFIG_ARM64_MTE 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1697 static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1698 { 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1699 /* 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1700 * Clear the tags in the zero page. This needs to be done via the 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1701 * linear map which has the Tagged attribute. 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1702 */ 36c5708fe6f882 Catalin Marinas 2021-02-10 1703 if (!test_and_set_bit(PG_mte_tagged, &ZERO_PAGE(0)->flags)) 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1704 mte_clear_page_tags(lm_alias(empty_zero_page)); 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1705 } 34bfeea4a9e9cd Catalin Marinas 2020-05-04 @1706 } 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1707 #endif /* CONFIG_ARM64_MTE */ 34bfeea4a9e9cd Catalin Marinas 2020-05-04 1708 :::::: The code at line 1706 was first introduced by commit :::::: 34bfeea4a9e9cdae713637541f240c3adfdfede3 arm64: mte: Clear the tags when a page is mapped in user-space with PROT_MTE :::::: TO: Catalin Marinas <catalin.marinas(a)arm.com&gt; :::::: CC: Catalin Marinas <catalin.marinas(a)arm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org