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* arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac:   0f ff e9                     ud0    %ecx,%ebp
@ 2018-02-07 22:04 kbuild test robot
  2018-02-08 14:34 ` Masami Hiramatsu
  0 siblings, 1 reply; 4+ messages in thread
From: kbuild test robot @ 2018-02-07 22:04 UTC (permalink / raw)
  To: Masami Hiramatsu; +Cc: kbuild-all, linux-kernel, Ingo Molnar

[-- Attachment #1: Type: text/plain, Size: 11099 bytes --]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7590e37bdaeec25ae325f4ba450be13e2aac6c8d
commit: 10c91577d5e631773a6394e14cf60125389b71ae x86/tools: Standardize output format of insn_decode_test
date:   8 weeks ago
config: x86_64-randconfig-s2-02072130 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout 10c91577d5e631773a6394e14cf60125389b71ae
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>> arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac:	0f ff e9             	ud0    %ecx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff8100207e:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81002218:	0f ff e9             	ud0    %ecx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81002317:	0f ff e9             	ud0    %ecx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff810029f4:	0f ff e9             	ud0    %ecx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81002af4:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81002c27:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81002da5:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81002dd5:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81002eda:	0f ff 65 8b          	ud0    -0x75(%rbp),%esp
   arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81002f58:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff810030c6:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81003158:	0f ff 5b 5d          	ud0    0x5d(%rbx),%ebx
   arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff8100404c:	0f ff 5b 5d          	ud0    0x5d(%rbx),%ebx
   arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81004053:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81004056:	f7 0f ff eb ab 0f    	testl  $0xfabebff,(%rdi)
   arch/x86/tools/insn_decoder_test: warning: objdump says 6 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81005004:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81005039:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff810052a4:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81005889:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff8100588d:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff810059a1:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81005a3a:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff8100609f:	0f ff c3             	ud0    %ebx,%eax
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff8100617c:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff8100620a:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff8100652b:	0f ff c3             	ud0    %ebx,%eax
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff8100655a:	0f ff e9             	ud0    %ecx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff810069ce:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81007332:	0f ff c3             	ud0    %ebx,%eax
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81007382:	0f ff c3             	ud0    %ebx,%eax
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81007c1f:	0f ff 41 8b          	ud0    -0x75(%rcx),%eax
   arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81007c2f:	0f ff eb             	ud0    %ebx,%ebp
   arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
   arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
   arch/x86/tools/insn_decoder_test: warning: ffffffff81008a3c:	0f ff 5b 5d          	ud0    0x5d(%rbx),%ebx
   arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 27945 bytes --]

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0    %ecx,%ebp
  2018-02-07 22:04 arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx,%ebp kbuild test robot
@ 2018-02-08 14:34 ` Masami Hiramatsu
  2018-02-09  0:30   ` [kbuild-all] arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx, %ebp Hao, Shun
  0 siblings, 1 reply; 4+ messages in thread
From: Masami Hiramatsu @ 2018-02-08 14:34 UTC (permalink / raw)
  To: kbuild test robot; +Cc: kbuild-all, linux-kernel, Ingo Molnar

On Thu, 8 Feb 2018 06:04:45 +0800
kbuild test robot <fengguang.wu@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   7590e37bdaeec25ae325f4ba450be13e2aac6c8d
> commit: 10c91577d5e631773a6394e14cf60125389b71ae x86/tools: Standardize output format of insn_decode_test
> date:   8 weeks ago
> config: x86_64-randconfig-s2-02072130 (attached as .config)
> compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
> reproduce:
>         git checkout 10c91577d5e631773a6394e14cf60125389b71ae
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All warnings (new ones prefixed by >>):
> 
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> >> arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac:	0f ff e9             	ud0    %ecx,%ebp

Does UD0 really take an operand? Hmm, indeed, the latest Intel SDM (December2017) says

NOTES:
1. Some older processors decode the UD0 instruction without a ModR/M byte. As a result, those processors would deliver an invalid-
opcode exception instead of a fault on instruction fetch when the instruction with a ModR/M byte (and any implied bytes) would
cross a page or segment boundary.

and older SDM (e.g. March 2017) says UD0 has no modrm byte.
It is easy to change x86-opecode-map.txt, but this means this test may fail with older objdump...

>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff8100207e:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81002218:	0f ff e9             	ud0    %ecx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81002317:	0f ff e9             	ud0    %ecx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff810029f4:	0f ff e9             	ud0    %ecx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81002af4:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81002c27:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81002da5:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81002dd5:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81002eda:	0f ff 65 8b          	ud0    -0x75(%rbp),%esp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81002f58:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff810030c6:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81003158:	0f ff 5b 5d          	ud0    0x5d(%rbx),%ebx
>    arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff8100404c:	0f ff 5b 5d          	ud0    0x5d(%rbx),%ebx
>    arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81004053:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81004056:	f7 0f ff eb ab 0f    	testl  $0xfabebff,(%rdi)
>    arch/x86/tools/insn_decoder_test: warning: objdump says 6 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81005004:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81005039:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff810052a4:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81005889:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff8100588d:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff810059a1:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81005a3a:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff8100609f:	0f ff c3             	ud0    %ebx,%eax
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff8100617c:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff8100620a:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff8100652b:	0f ff c3             	ud0    %ebx,%eax
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff8100655a:	0f ff e9             	ud0    %ecx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff810069ce:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81007332:	0f ff c3             	ud0    %ebx,%eax
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81007382:	0f ff c3             	ud0    %ebx,%eax
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81007c1f:	0f ff 41 8b          	ud0    -0x75(%rcx),%eax
>    arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81007c2f:	0f ff eb             	ud0    %ebx,%ebp
>    arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
>    arch/x86/tools/insn_decoder_test: warning: ffffffff81008a3c:	0f ff 5b 5d          	ud0    0x5d(%rbx),%ebx
>    arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation


-- 
Masami Hiramatsu <mhiramat@kernel.org>

^ permalink raw reply	[flat|nested] 4+ messages in thread
* RE: [kbuild-all] arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx, %ebp
  2018-02-08 14:34 ` Masami Hiramatsu
@ 2018-02-09  0:30   ` Hao, Shun
  2018-02-10 16:01     ` Masami Hiramatsu
  0 siblings, 1 reply; 4+ messages in thread
From: Hao, Shun @ 2018-02-09  0:30 UTC (permalink / raw)
  To: Masami Hiramatsu, Wu, Fengguang
  Cc: Ingo Molnar, kbuild-all, linux-kernel, Hao, Shun

Thanks Masami, so that explains why a lot of these warnings come out just after 
we upgrading to gcc-7.3 (now the objdump version is 2.30). 
Currently we've already ignore these warnings and won't send this report. 

>-----Original Message-----
>From: kbuild-all [mailto:kbuild-all-bounces@lists.01.org] On Behalf Of Masami
>Hiramatsu
>Sent: Thursday, February 8, 2018 10:34 PM
>To: Wu, Fengguang <fengguang.wu@intel.com>
>Cc: Ingo Molnar <mingo@kernel.org>; kbuild-all@01.org; linux-
>kernel@vger.kernel.org
>Subject: Re: [kbuild-all] arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac:
>0f ff e9 ud0 %ecx, %ebp
>
>On Thu, 8 Feb 2018 06:04:45 +0800
>kbuild test robot <fengguang.wu@intel.com> wrote:
>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   7590e37bdaeec25ae325f4ba450be13e2aac6c8d
>> commit: 10c91577d5e631773a6394e14cf60125389b71ae x86/tools: Standardize
>output format of insn_decode_test
>> date:   8 weeks ago
>> config: x86_64-randconfig-s2-02072130 (attached as .config)
>> compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
>> reproduce:
>>         git checkout 10c91577d5e631773a6394e14cf60125389b71ae
>>         # save the attached .config to linux build tree
>>         make ARCH=x86_64
>>
>> All warnings (new ones prefixed by >>):
>>
>>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug,
>please report this.
>> >> arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac:	0f ff e9
>	ud0    %ecx,%ebp
>
>Does UD0 really take an operand? Hmm, indeed, the latest Intel SDM (December2017)
>says
>
>NOTES:
>1. Some older processors decode the UD0 instruction without a ModR/M byte. As a
>result, those processors would deliver an invalid-
>opcode exception instead of a fault on instruction fetch when the instruction with a
>ModR/M byte (and any implied bytes) would
>cross a page or segment boundary.
>
>and older SDM (e.g. March 2017) says UD0 has no modrm byte.
>It is easy to change x86-opecode-map.txt, but this means this test may fail with older
>objdump...
>
>>
>> ---
>> 0-DAY kernel test infrastructure                Open Source Technology Center
>> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
>
>
>--
>Masami Hiramatsu <mhiramat@kernel.org>
>_______________________________________________
>kbuild-all mailing list
>kbuild-all@lists.01.org
>https://lists.01.org/mailman/listinfo/kbuild-all

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: [kbuild-all] arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx, %ebp
  2018-02-09  0:30   ` [kbuild-all] arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx, %ebp Hao, Shun
@ 2018-02-10 16:01     ` Masami Hiramatsu
  0 siblings, 0 replies; 4+ messages in thread
From: Masami Hiramatsu @ 2018-02-10 16:01 UTC (permalink / raw)
  To: Hao, Shun; +Cc: Wu, Fengguang, Ingo Molnar, kbuild-all, linux-kernel

Hi,

On Fri, 9 Feb 2018 00:30:20 +0000
"Hao, Shun" <shun.hao@intel.com> wrote:

> Thanks Masami, so that explains why a lot of these warnings come out just after 
> we upgrading to gcc-7.3 (now the objdump version is 2.30). 
> Currently we've already ignore these warnings and won't send this report. 

Anyway, it must be fixed with the below patch.

https://lkml.org/lkml/2018/2/8/350

(Sorry, I replyed to another warning mail)

Thank you,

> 
> >-----Original Message-----
> >From: kbuild-all [mailto:kbuild-all-bounces@lists.01.org] On Behalf Of Masami
> >Hiramatsu
> >Sent: Thursday, February 8, 2018 10:34 PM
> >To: Wu, Fengguang <fengguang.wu@intel.com>
> >Cc: Ingo Molnar <mingo@kernel.org>; kbuild-all@01.org; linux-
> >kernel@vger.kernel.org
> >Subject: Re: [kbuild-all] arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac:
> >0f ff e9 ud0 %ecx, %ebp
> >
> >On Thu, 8 Feb 2018 06:04:45 +0800
> >kbuild test robot <fengguang.wu@intel.com> wrote:
> >
> >> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> >> head:   7590e37bdaeec25ae325f4ba450be13e2aac6c8d
> >> commit: 10c91577d5e631773a6394e14cf60125389b71ae x86/tools: Standardize
> >output format of insn_decode_test
> >> date:   8 weeks ago
> >> config: x86_64-randconfig-s2-02072130 (attached as .config)
> >> compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
> >> reproduce:
> >>         git checkout 10c91577d5e631773a6394e14cf60125389b71ae
> >>         # save the attached .config to linux build tree
> >>         make ARCH=x86_64
> >>
> >> All warnings (new ones prefixed by >>):
> >>
> >>    arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug,
> >please report this.
> >> >> arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac:	0f ff e9
> >	ud0    %ecx,%ebp
> >
> >Does UD0 really take an operand? Hmm, indeed, the latest Intel SDM (December2017)
> >says
> >
> >NOTES:
> >1. Some older processors decode the UD0 instruction without a ModR/M byte. As a
> >result, those processors would deliver an invalid-
> >opcode exception instead of a fault on instruction fetch when the instruction with a
> >ModR/M byte (and any implied bytes) would
> >cross a page or segment boundary.
> >
> >and older SDM (e.g. March 2017) says UD0 has no modrm byte.
> >It is easy to change x86-opecode-map.txt, but this means this test may fail with older
> >objdump...
> >
> >>
> >> ---
> >> 0-DAY kernel test infrastructure                Open Source Technology Center
> >> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
> >
> >
> >--
> >Masami Hiramatsu <mhiramat@kernel.org>
> >_______________________________________________
> >kbuild-all mailing list
> >kbuild-all@lists.01.org
> >https://lists.01.org/mailman/listinfo/kbuild-all


-- 
Masami Hiramatsu <mhiramat@kernel.org>

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-02-10 16:01 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-02-07 22:04 arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx,%ebp kbuild test robot
2018-02-08 14:34 ` Masami Hiramatsu
2018-02-09  0:30   ` [kbuild-all] arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx, %ebp Hao, Shun
2018-02-10 16:01     ` Masami Hiramatsu

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