RE: [kbuild-all] [nf:master 1/9] arch/x86/tools/insn_decoder_test: warning: ffffffff817c07c3: 0f ff e9 ud0 %ecx, %ebp

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> On Wed 07-02-18 10:16:31, Wu Fengguang wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git master
> > head:   b408c5b04f82fe4e20bceb8e4f219453d4f21f02
> > commit: 0537250fdc6c876ed4cbbe874c739aebef493ee2 [1/9] netfilter: x_tables:
> make allocation less aggressive
> > config: x86_64-rhel-7.2 (attached as .config)
> > compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> > reproduce:
> >         git checkout 0537250fdc6c876ed4cbbe874c739aebef493ee2
> >         # 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: ffffffff817aed81:	0f ff c3
> 	ud0    %ebx,%eax
> 
> I really fail to see how the above patch could have made any difference.
> I am even not sure what the actual bug is, to be honest.
sorry for the noise, this is a false positive after we upgrade to gcc7.3. We have
blacklisted this warning in test farm, and kernel side has started the fix to handle
this. Kindly ignore this report.

> 
> --
> Michal Hocko
> SUSE Labs
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