tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 8ca403f3e7a23c4513046ad8d107adfbe4703362 commit: 4a2b285e7e103d4d6c6ed3e5052a0ff74a5d7f15 [6410/6860] net: igmp: fix data-race in igmp_ifc_timer_expire() config: riscv-allyesconfig (attached as .config) compiler: riscv64-linux-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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 4a2b285e7e103d4d6c6ed3e5052a0ff74a5d7f15 # 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=riscv 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 >>): In file included from <command-line>: net/ipv4/igmp.c: In function 'igmp_ifc_timer_expire': 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:309:4: note: in definition of macro '__compiletime_assert' 309 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler_types.h:328:2: note: in expansion of macro '_compiletime_assert' 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) | ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:59:21: note: in expansion of macro 'BUILD_BUG_ON_MSG' 59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed") | ^~~~~~~~~~~~~~~~ arch/riscv/include/asm/cmpxchg.h:335:3: note: in expansion of macro 'BUILD_BUG' 335 | BUILD_BUG(); \ | ^~~~~~~~~ arch/riscv/include/asm/cmpxchg.h:344:23: note: in expansion of macro '__cmpxchg' 344 | (__typeof__(*(ptr))) __cmpxchg((ptr), \ | ^~~~~~~~~ include/asm-generic/atomic-instrumented.h:1212:2: note: in expansion of macro 'arch_cmpxchg' 1212 | arch_cmpxchg(__ai_ptr, __VA_ARGS__); \ | ^~~~~~~~~~~~ net/ipv4/igmp.c:813:7: note: in expansion of macro 'cmpxchg' 813 | if (cmpxchg(&in_dev->mr_ifc_count, | ^~~~~~~ vim +/__compiletime_assert_596 +328 include/linux/compiler_types.h eb5c2d4b45e3d2 Will Deacon 2020-07-21 314 eb5c2d4b45e3d2 Will Deacon 2020-07-21 315 #define _compiletime_assert(condition, msg, prefix, suffix) \ eb5c2d4b45e3d2 Will Deacon 2020-07-21 316 __compiletime_assert(condition, msg, prefix, suffix) eb5c2d4b45e3d2 Will Deacon 2020-07-21 317 eb5c2d4b45e3d2 Will Deacon 2020-07-21 318 /** eb5c2d4b45e3d2 Will Deacon 2020-07-21 319 * compiletime_assert - break build and emit msg if condition is false eb5c2d4b45e3d2 Will Deacon 2020-07-21 320 * @condition: a compile-time constant condition to check eb5c2d4b45e3d2 Will Deacon 2020-07-21 321 * @msg: a message to emit if condition is false eb5c2d4b45e3d2 Will Deacon 2020-07-21 322 * eb5c2d4b45e3d2 Will Deacon 2020-07-21 323 * In tradition of POSIX assert, this macro will break the build if the eb5c2d4b45e3d2 Will Deacon 2020-07-21 324 * supplied condition is *false*, emitting the supplied error message if the eb5c2d4b45e3d2 Will Deacon 2020-07-21 325 * compiler has support to do so. eb5c2d4b45e3d2 Will Deacon 2020-07-21 326 */ eb5c2d4b45e3d2 Will Deacon 2020-07-21 327 #define compiletime_assert(condition, msg) \ eb5c2d4b45e3d2 Will Deacon 2020-07-21 @328 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) eb5c2d4b45e3d2 Will Deacon 2020-07-21 329 :::::: The code at line 328 was first introduced by commit :::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h :::::: TO: Will Deacon <will(a)kernel.org&gt; :::::: CC: Will Deacon <will(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org