Re: [PATCH 6.6 000/533] 6.6.54-rc2 review

[Wang Yugui]

Hi,

> On Fri, Oct 04, 2024 at 07:17:24AM +0800, Wang Yugui wrote:
> > Hi,
> > 
> > > This is the start of the stable review cycle for the 6.6.54 release.
> > > There are 533 patches in this series, all will be posted as a response
> > > to this one.  If anyone has any issues with these being applied, please
> > > let me know.
> > > 
> > > Responses should be made by Sat, 05 Oct 2024 10:30:30 +0000.
> > > Anything received after that time might be too late.
> > > 
> > > The whole patch series can be found in one patch at:
> > > 	https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.6.54-rc2.gz
> > > or in the git tree and branch at:
> > > 	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.6.y
> > > and the diffstat can be found below.
> > 
> > A new waring is report by 'make bzImage' in 6.6.54-rc2, 
> > but that is not reported in 6.6.53 and 6.12-rc1.
> > 
> > arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> > arch/x86/tools/insn_decoder_test: warning: ffffffff8103c4d5:    c4 03 81 48 cf e9       vpermil2ps $0x9,%xmm15,%xmm14,%xmm15,%xmm9
> > arch/x86/tools/insn_decoder_test: warning: objdump says 6 bytes, but insn_get_length() says 0
> > arch/x86/tools/insn_decoder_test: warning: Decoded and checked 6968668 instructions with 1 failures
> > 
> > the root cause is yet not clear.
> 
> I've been seeing this locally for all 6.6.y releases, so for me it isn't
> new, and I can't seem to track down the root cause.  As it's just now
> showing up for you, can you do a 'git bisect' to find out the issue?

'git bisect'  show that the root cause is
	x86/entry: Remove unwanted instrumentation in common_interrupt()

after reverting this patch to 6.6.54-rc2, this warning does not happen.

gcc --version:
gcc (GCC) 8.3.1 20190311 (Red Hat 8.3.1-3)

Best Regards
Wang Yugui (wangyugui@xxxxxxxxxxxx)
2024/10/04