Hi Karsten, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 09162bc32c880a791c6c0668ce0745cf7958f576 commit: f3811fd7bc97587b142fed9edf8c726694220cb2 net/smc: send DELETE_LINK, ALL message and wait for send to complete date: 7 months ago config: arm-randconfig-r012-20201116 (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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout f3811fd7bc97587b142fed9edf8c726694220cb2 # 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 errors (new ones prefixed by >>): net/smc/smc_llc.c: In function 'smc_llc_cli_conf_link': net/smc/smc_llc.c:754:31: warning: variable 'del_llc' set but not used [-Wunused-but-set-variable] 754 | struct smc_llc_msg_del_link *del_llc; | ^~~~~~~ net/smc/smc_llc.c: In function 'smc_llc_process_srv_delete_link': net/smc/smc_llc.c:1301:33: warning: variable 'del_llc_resp' set but not used [-Wunused-but-set-variable] 1301 | struct smc_llc_msg_del_link *del_llc_resp; | ^~~~~~~~~~~~ In file included from include/linux/kernel.h:11, from include/linux/list.h:9, from include/net/tcp.h:19, from net/smc/smc_llc.c:13: net/smc/smc_llc.c: In function 'smc_llc_add_pending_send': include/linux/compiler.h:350:38: error: call to '__compiletime_assert_198' declared with attribute error: must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg) 350 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert' 331 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert' 350 | _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) | ^~~~~~~~~~~~~~~~~~ net/smc/smc_llc.c:348:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' 348 | BUILD_BUG_ON_MSG( | ^~~~~~~~~~~~~~~~ include/linux/compiler.h:350:38: error: call to '__compiletime_assert_199' declared with attribute error: must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send() 350 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert' 331 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert' 350 | _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) | ^~~~~~~~~~~~~~~~~~ net/smc/smc_llc.c:351:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' 351 | BUILD_BUG_ON_MSG( | ^~~~~~~~~~~~~~~~ In file included from include/linux/bitmap.h:9, from include/linux/nodemask.h:95, from include/linux/mmzone.h:17, from include/linux/gfp.h:6, from include/linux/mm.h:10, from include/linux/bvec.h:13, from include/linux/skbuff.h:17, from include/linux/tcp.h:17, from include/net/tcp.h:20, from net/smc/smc_llc.c:13: In function 'memcpy', inlined from 'smc_llc_send_message_wait' at net/smc/smc_llc.c:578:2, inlined from 'smc_llc_send_link_delete_all' at net/smc/smc_llc.c:1255:8: 377 | __read_overflow2(); | ^~~~~~~~~~~~~~~~~~ vim +/__read_overflow2 +377 include/linux/string.h 6974f0c4555e285 Daniel Micay 2017-07-12 368 6974f0c4555e285 Daniel Micay 2017-07-12 369 __FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size) 6974f0c4555e285 Daniel Micay 2017-07-12 370 { 6974f0c4555e285 Daniel Micay 2017-07-12 371 size_t p_size = __builtin_object_size(p, 0); 6974f0c4555e285 Daniel Micay 2017-07-12 372 size_t q_size = __builtin_object_size(q, 0); 6974f0c4555e285 Daniel Micay 2017-07-12 373 if (__builtin_constant_p(size)) { 6974f0c4555e285 Daniel Micay 2017-07-12 374 if (p_size < size) 6974f0c4555e285 Daniel Micay 2017-07-12 375 __write_overflow(); 6974f0c4555e285 Daniel Micay 2017-07-12 376 if (q_size < size) 6974f0c4555e285 Daniel Micay 2017-07-12 @377 __read_overflow2(); 6974f0c4555e285 Daniel Micay 2017-07-12 378 } 6974f0c4555e285 Daniel Micay 2017-07-12 379 if (p_size < size || q_size < size) 6974f0c4555e285 Daniel Micay 2017-07-12 380 fortify_panic(__func__); 6974f0c4555e285 Daniel Micay 2017-07-12 381 return __builtin_memcpy(p, q, size); 6974f0c4555e285 Daniel Micay 2017-07-12 382 } 6974f0c4555e285 Daniel Micay 2017-07-12 383 :::::: The code at line 377 was first introduced by commit :::::: 6974f0c4555e285ab217cee58b6e874f776ff409 include/linux/string.h: add the option of fortified string.h functions :::::: TO: Daniel Micay <danielmicay(a)gmail.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org