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Date:   Wed, 1 Mar 2017 11:50:24 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf test 'instruction decoder' failing

Em Tue, Feb 28, 2017 at 12:02:36PM +0200, Adrian Hunter escreveu:
> On 24/02/17 22:27, Arnaldo Carvalho de Melo wrote:
> > Hi Adrian,
> > 
> > 	This test is failing, I'll try to recheck this and bisect it,
> > but since I haven't had the time so far and I saw it since yesterday (at
> > least), lemme document it here:
> > 
> > 
> > [root@...et ~]# perf test -v 57
> > 57: x86 instruction decoder - new instructions :
> > --- start ---
> > test child forked, pid 18975
> > Decoded ok: 0f 31                	rdtsc  
> > Decoded ok: 0f 1b 80 78 56 34 12 	bndstx %bnd0,0x12345678(%eax)
> > <SNIP tons of OKays>
> > Decoded ok: 0f 1b 85 78 56 34 12 	bndstx %bnd0,0x12345678(%ebp)
> > Decoded ok: 0f 1b 84 01 78 56 34 12 	bndstx %bnd0,0x12345678(%ecx,%eax,1)
> > Decoded ok: 0f 1b 84 05 78 56 34 12 	bndstx %bnd0,0x12345678(%ebp,%eax,1)
> > Decoded ok: 0f 1b 84 08 78 56 34 12 	bndstx %bnd0,0x12345678(%eax,%ecx,1)
> > Decoded ok: f2 e8 fc ff ff ff    	bnd call fce <main+0xfce>
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): f2 ff 10             	bnd call *(%eax)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): f2 c3                	bnd ret 
> > Decoded ok: f2 e9 fc ff ff ff    	bnd jmp fd9 <main+0xfd9>
> > Decoded ok: f2 e9 fc ff ff ff    	bnd jmp fdf <main+0xfdf>
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): f2 ff 21             	bnd jmp *(%ecx)
> > Decoded ok: f2 0f 85 fc ff ff ff 	bnd jne fe9 <main+0xfe9>
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc c1 00       	sha1rnds4 $0x0,%xmm1,%xmm0
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc d7 91       	sha1rnds4 $0x91,%xmm7,%xmm2
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc 00 91       	sha1rnds4 $0x91,(%eax),%xmm0
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc 05 78 56 34 12 91 	sha1rnds4 $0x91,0x12345678,%xmm0
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc 18 91       	sha1rnds4 $0x91,(%eax),%xmm3
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc 04 01 91    	sha1rnds4 $0x91,(%ecx,%eax,1),%xmm0
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc 04 05 78 56 34 12 91 	sha1rnds4 $0x91,0x12345678(,%eax,1),%xmm0
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc 04 08 91    	sha1rnds4 $0x91,(%eax,%ecx,1),%xmm0
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 3a cc 04 c8 91    	sha1rnds4 $0x91,(%eax,%ecx,8),%xmm0
> > <SNIP lots of fails>
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 45 12          	bndstx %bnd0,0x12(%rbp)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 44 01 12       	bndstx %bnd0,0x12(%rcx,%rax,1)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 44 05 12       	bndstx %bnd0,0x12(%rbp,%rax,1)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 44 08 12       	bndstx %bnd0,0x12(%rax,%rcx,1)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 80 78 56 34 12 	bndstx %bnd0,0x12345678(%rax)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 85 78 56 34 12 	bndstx %bnd0,0x12345678(%rbp)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 01 78 56 34 12 	bndstx %bnd0,0x12345678(%rcx,%rax,1)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 05 78 56 34 12 	bndstx %bnd0,0x12345678(%rbp,%rax,1)
> > Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 08 78 56 34 12 	bndstx %bnd0,0x12345678(%rax,%rcx,1)
> > Decoded ok: f2 e8 00 00 00 00    	bnd callq f22 <main+0xf22>
> > Decoded ok: 67 f2 ff 10          	bnd callq *(%eax)
> > <SNIP lots of OKays>
> > Decoded ok: 41 0f c7 9c c8 78 56 34 12 	xrstors 0x12345678(%r8,%rcx,8)
> > Decoded ok: 0f 01 ee             	rdpkru
> > Decoded ok: 0f 01 ef             	wrpkru
> > test child finished with -1
> > ---- end ----
> > x86 instruction decoder - new instructions: FAILED!
> > 
> > Fedora 25,
> > 
> > [acme@...et linux]$ uname -a
> > Linux jouet 4.10.0-rc8 #2 SMP Wed Feb 15 15:26:36 BRT 2017 x86_64 x86_64 x86_64 GNU/Linux
> > 
> > [acme@...et linux]$ rpm -q binutils elfutils gcc glibc
> > binutils-2.26.1-1.fc25.x86_64
> > elfutils-0.168-1.fc25.x86_64
> > gcc-6.3.1-1.fc25.x86_64
> > glibc-2.24-4.fc25.x86_64
> > glibc-2.24-4.fc25.i686
> > [acme@...et linux]$
> > 
> > [acme@...et linux]$ perf -v
> > perf version 4.10.g264b77
> > 
> > perf as in tip/perf/core and soon as in acme/perf/core
> 
> There is missing initialization.  It only affects the test because it is checking 'rel' even in cases where there is no value.
> 
> Here is the fix.

Thanks, I'll test it, I assume I can add your Signed-off-by: tag to this
cset, ok? The comment I can just use your missing init comment above,

Thanks,

- Arnaldo
 
> 
> diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
> index 7913363bde5c..55b6250350d7 100644
> --- a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
> +++ b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
> @@ -39,6 +39,8 @@ static void intel_pt_insn_decoder(struct insn *insn,
>  	enum intel_pt_insn_branch branch = INTEL_PT_BR_NO_BRANCH;
>  	int ext;
>  
> +	intel_pt_insn->rel = 0;
> +
>  	if (insn_is_avx(insn)) {
>  		intel_pt_insn->op = INTEL_PT_OP_OTHER;
>  		intel_pt_insn->branch = INTEL_PT_BR_NO_BRANCH;
> 
> 

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