tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.19 head: 44e67a183b957910c92ce954ecf443dc9a5bad2d commit: 142e293ce46a1c63cb167af6743e2b8abb6581df [19/27] netfilter: nftables: fix possible UAF over chains from packet path in netns config: arm-randconfig-c004-20210215 (attached as .config) compiler: arm-linux-gnueabi-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-4.19 git checkout 142e293ce46a1c63cb167af6743e2b8abb6581df # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): net/netfilter/nf_tables_api.c: In function 'nft_request_module': net/netfilter/nf_tables_api.c:518:2: warning: function 'nft_request_module' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 518 | ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args); | ^~~ net/netfilter/nf_tables_api.c: At top level: 7395 | .pre_exit = nf_tables_pre_exit_net, | ^~~~~~~~ 7396 | .exit = nf_tables_exit_net, | ^~~~~~~~~~~~~~~~~~ net/netfilter/nf_tables_api.c:7396:11: note: (near initialization for 'nf_tables_net_ops.exit') vim +7395 net/netfilter/nf_tables_api.c 7392 7393 static struct pernet_operations nf_tables_net_ops = { 7394 .init = nf_tables_init_net, 7397 }; 7398 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org