tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git master head: 7895d16159ceaf00aaec3790896a2a5851541ec2 commit: ce0bd4476f7816fe71b962d213bb3b180c66bf30 [14/16] Merge branch 'x86/module' config: x86_64-rhel-7.6-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue master git checkout ce0bd4476f7816fe71b962d213bb3b180c66bf30 # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 >>): arch/x86/kernel/module.c: In function 'decode_module': 485 | kernel_insn_init(&insn, text, text_end - text); | ^~~~~~~~~~~~~~~~ | kernfs_init In file included from arch/x86/include/asm/bug.h:93, from include/linux/bug.h:5, from include/linux/cpumask.h:14, from arch/x86/include/asm/cpumask.h:5, from arch/x86/include/asm/msr.h:11, from arch/x86/include/asm/processor.h:22, from arch/x86/include/asm/timex.h:5, from include/linux/timex.h:65, from include/linux/time32.h:13, from include/linux/time.h:60, from include/linux/stat.h:19, from include/linux/module.h:13, from include/linux/moduleloader.h:6, from arch/x86/kernel/module.c:9: 488 | if (WARN_ON_ONCE(!insn_complete(&insn))) { | ^~~~~~~~~~~~~ include/asm-generic/bug.h:102:25: note: in definition of macro 'WARN_ON_ONCE' 102 | int __ret_warn_on = !!(condition); \ | ^~~~~~~~~ cc1: some warnings being treated as errors vim +485 arch/x86/kernel/module.c 2c8b51426d7dcb Peter Zijlstra 2020-04-08 478 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 479 static int decode_module(struct module *mod, void *text, void *text_end, bool sld_safe) 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 480 { 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 481 bool allow_vmx = sld_safe || !split_lock_enabled(); 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 482 struct insn insn; 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 483 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 484 while (text < text_end) { 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 @485 kernel_insn_init(&insn, text, text_end - text); 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 486 insn_get_length(&insn); 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 487 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 @488 if (WARN_ON_ONCE(!insn_complete(&insn))) { 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 489 pr_err("Module text malformed: %s\n", mod->name); 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 490 return -ENOEXEC; 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 491 } 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 492 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 493 if (!allow_vmx && insn_is_vmx(&insn)) { 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 494 pr_err("Module has VMX instructions and is not marked 'sld_safe', boot with: 'split_lock_detect=off': %s\n", mod->name); 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 495 return -ENOEXEC; 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 496 } 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 497 66b8cf79e55c95 Peter Zijlstra 2020-04-07 498 if (insn_is_special_reg(&insn)) { 66b8cf79e55c95 Peter Zijlstra 2020-04-07 499 pr_err("Module writes to CRn, XCRn or DRn, please use the proper accessors: %s\n", mod->name); 66b8cf79e55c95 Peter Zijlstra 2020-04-07 500 return -ENOEXEC; 66b8cf79e55c95 Peter Zijlstra 2020-04-07 501 } 66b8cf79e55c95 Peter Zijlstra 2020-04-07 502 2c8b51426d7dcb Peter Zijlstra 2020-04-08 503 if (insn_is_GDT_modifier(&insn)) { 2c8b51426d7dcb Peter Zijlstra 2020-04-08 504 pr_err("Module tries to modify the GDT, please use the proper accessors: %s\n", mod->name); 2c8b51426d7dcb Peter Zijlstra 2020-04-08 505 return -ENOEXEC; 2c8b51426d7dcb Peter Zijlstra 2020-04-08 506 } 2c8b51426d7dcb Peter Zijlstra 2020-04-08 507 2c8b51426d7dcb Peter Zijlstra 2020-04-08 508 if (insn_is_xRET(&insn)) { 2c8b51426d7dcb Peter Zijlstra 2020-04-08 509 pr_err("Module tries to return to userspace: %s\n", mod->name); 2c8b51426d7dcb Peter Zijlstra 2020-04-08 510 return -ENOEXEC; 2c8b51426d7dcb Peter Zijlstra 2020-04-08 511 } 2c8b51426d7dcb Peter Zijlstra 2020-04-08 512 2c8b51426d7dcb Peter Zijlstra 2020-04-08 513 if (insn_is_XRSTOR(&insn)) { 2c8b51426d7dcb Peter Zijlstra 2020-04-08 514 pr_err("Module tries to muck with register state: %s\n", mod->name); 2c8b51426d7dcb Peter Zijlstra 2020-04-08 515 return -ENOEXEC; 2c8b51426d7dcb Peter Zijlstra 2020-04-08 516 } 2c8b51426d7dcb Peter Zijlstra 2020-04-08 517 2c8b51426d7dcb Peter Zijlstra 2020-04-08 518 if (insn_is_FSGS(&insn)) { 2c8b51426d7dcb Peter Zijlstra 2020-04-08 519 pr_err("Module mucks with FS/GS-base: %s\n", mod->name); 2c8b51426d7dcb Peter Zijlstra 2020-04-08 520 return -ENOEXEC; 2c8b51426d7dcb Peter Zijlstra 2020-04-08 521 } 2c8b51426d7dcb Peter Zijlstra 2020-04-08 522 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 523 text += insn.length; 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 524 } 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 525 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 526 return 0; 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 527 } 5fc97b3a93ac01 Peter Zijlstra 2020-04-02 528 :::::: The code at line 485 was first introduced by commit :::::: 5fc97b3a93ac0160bfc9e5a3dcada67870d9aa29 x86,module: Detect VMX vs SLD conflicts :::::: TO: Peter Zijlstra <peterz(a)infradead.org&gt; :::::: CC: Peter Zijlstra <peterz(a)infradead.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org