[android-goldfish:android-4.14 1/2] Warning: ffffffff81ca0d60: 0f ff 49 8d ud0 -0x73(%rcx),%ecx

[kbuild test robot]

tree: https://android.googlesource.com/kernel/goldfish android-4.14
head: bb8ba1da294318ef080cfedb3a632d0035bb0949
commit: b8bcfe587e1724f14394a8cae68d7d9ad7ccb55e [1/2] UPSTREAM: loop: Only change blocksize when needed.
config: x86_64-randconfig-e001-20200410 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 7149bb70681a91de5d490b4bb0714d9e55a05bcc)
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout b8bcfe587e1724f14394a8cae68d7d9ad7ccb55e
# save the attached .config to linux build tree
COMPILER=clang make.cross ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <l...@intel.com>

All warnings (new ones prefixed by >>):

>> Warning: ffffffff81ca0d60: 0f ff 49 8d ud0 -0x73(%rcx),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca11f2: 0f ff 49 8d ud0 -0x73(%rcx),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca145f: 0f ff 48 8d ud0 -0x73(%rax),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca1516: 0f ff 48 8d ud0 -0x73(%rax),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca173b: 0f ff 48 8d ud0 -0x73(%rax),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca17c8: 0f ff 48 8d ud0 -0x73(%rax),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca1955: 0f ff 48 8d ud0 -0x73(%rax),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca1973: 0f ff 48 8d ud0 -0x73(%rax),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca1b86: 0f ff 49 8d ud0 -0x73(%rcx),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca1bd4: 0f ff 48 8d ud0 -0x73(%rax),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
--
>> Warning: ffffffff81ca1bda: 0f ff 48 8d ud0 -0x73(%rax),%ecx
Warning: objdump says 4 bytes, but insn_get_length() says 2
Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a
..

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuil...@lists.01.org

[Nick Desaulniers]

On Sat, Apr 11, 2020 at 8:05 AM kbuild test robot <l...@intel.com> wrote:
>
> tree: https://android.googlesource.com/kernel/goldfish android-4.14
> head: bb8ba1da294318ef080cfedb3a632d0035bb0949
> commit: b8bcfe587e1724f14394a8cae68d7d9ad7ccb55e [1/2] UPSTREAM: loop: Only change blocksize when needed.
> config: x86_64-randconfig-e001-20200410 (attached as .config)
> compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 7149bb70681a91de5d490b4bb0714d9e55a05bcc)
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> git checkout b8bcfe587e1724f14394a8cae68d7d9ad7ccb55e
> # save the attached .config to linux build tree
> COMPILER=clang make.cross ARCH=x86_64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <l...@intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> Warning: ffffffff81ca0d60: 0f ff 49 8d ud0 -0x73(%rcx),%ecx
> Warning: objdump says 4 bytes, but insn_get_length() says 2
> Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff81ca026a

Looks like test_get_len exists in 4.14 but was removed between then
and 4.19. Oh, it was renamed to insn_decoder_test in commit
6b63dd119eb4 ("x86/tools: Rename test_get_len to insn_decoder_test")

ud0 looks like ud2...

Filed https://github.com/ClangBuiltLinux/linux/issues/992 to follow
up. The instruction lengths are important for alternatives.

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--
Thanks,
~Nick Desaulniers