linux-kernel - [mark:lkdtm/undefined-instruction 3/3] drivers/misc/lkdtm/bugs.o: warning: objtool: lkdtm_UNDEFINED

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Date:   Wed, 3 Aug 2022 19:18:14 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mark:lkdtm/undefined-instruction 3/3] drivers/misc/lkdtm/bugs.o:
 warning: objtool: lkdtm_UNDEFINED_INSTRUCTION+0x7: unreachable instruction

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git lkdtm/undefined-instruction
head:   c00c18c5cd880f0d015d997a92675d30a5706714
commit: c00c18c5cd880f0d015d997a92675d30a5706714 [3/3] x86: implement undefined_instruction()
config: x86_64-rhel-8.3-kselftests
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?id=c00c18c5cd880f0d015d997a92675d30a5706714
        git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
        git fetch --no-tags mark lkdtm/undefined-instruction
        git checkout c00c18c5cd880f0d015d997a92675d30a5706714
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/misc/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/misc/lkdtm/bugs.o: warning: objtool: lkdtm_UNDEFINED_INSTRUCTION+0x7: unreachable instruction


objdump-func vmlinux.o lkdtm_UNDEFINED_INSTRUCTION:
0000 0000000001813900 <lkdtm_UNDEFINED_INSTRUCTION>:
0000  1813900:	e8 00 00 00 00       	call   1813905 <lkdtm_UNDEFINED_INSTRUCTION+0x5>	1813901: R_X86_64_PLT32	__fentry__-0x4
0005  1813905:	0f 0b                	ud2    
0007  1813907:	48 c7 c7 00 00 00 00 	mov    $0x0,%rdi	181390a: R_X86_64_32S	.rodata+0x35dcc0
000e  181390e:	e9 00 00 00 00       	jmp    1813913 <lkdtm_UNDEFINED_INSTRUCTION+0x13>	181390f: R_X86_64_PLT32	_printk-0x4
0013  1813913:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)
001e  181391e:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)
0029  1813929:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)
0034  1813934:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)
003f  181393f:	90                   	nop

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

View attachment "config" of type "text/plain" (168873 bytes)