perf test 'instruction decoder' failing

[Arnaldo Carvalho de Melo <acme@kernel.org>]

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@jouet ~]# 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@jouet 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@jouet 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@jouet linux]$

[acme@jouet linux]$ perf -v
perf version 4.10.g264b77

perf as in tip/perf/core and soon as in acme/perf/core

- Arnaldo