Hi Eric, I love your patch! Yet something to improve: [auto build test ERROR on net/master] url: https://github.com/0day-ci/linux/commits/Eric-Dumazet/net-igmp-fix-data-r... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 143a8526ab5fd4f8a0c4fe2a9cb28c181dc5a95f config: arm-allyesconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 10.3.0 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://github.com/0day-ci/linux/commit/2c1a7459e8881e7c582abbc8ad6f898f3... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Eric-Dumazet/net-igmp-fix-data-race-in-igmp_ifc_timer_expire/20210810-175127 git checkout 2c1a7459e8881e7c582abbc8ad6f898f3678957d # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash 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 >>): arm-linux-gnueabi-ld: net/ipv4/igmp.o: in function `igmp_ifc_timer_expire': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org