[Bug dynamic-link/27061] New: Incorrect values in _rtld_global_ro._dl_x86_cpu_features

["hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27061

            Bug ID: 27061
           Summary: Incorrect values in
                    _rtld_global_ro._dl_x86_cpu_features
           Product: glibc
           Version: 2.33
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: i386,x86-64

On AVX2 machine, I got

Breakpoint 1, main () at test.c:40
40        size_t page_size = sysconf(_SC_PAGESIZE);
(gdb) p _rtld_global_ro._dl_x86_cpu_features 
$1 = {basic = {kind = arch_kind_intel, max_cpuid = 22, family = 6, 
    model = 142, stepping = 10}, features = {{cpuid = {eax = 526058, 
        ebx = 34605056, ecx = 2147154879, edx = 3219913727}, usable = {
        eax = 0, ebx = 0, ecx = 2128097795, edx = 394821904}}, {cpuid = {
        eax = 0, ebx = 43804591, ecx = 0, edx = 2617255424}, usable = {
        eax = 0, ebx = 9175848, ecx = 0, edx = 0}}, {cpuid = {eax = 0, 
        ebx = 0, ecx = 289, edx = 739248128}, usable = {eax = 0, ebx = 0, 
        ecx = 289, edx = 134217728}}, {cpuid = {eax = 15, ebx = 960, 
        ecx = 256, edx = 0}, usable = {eax = 7, ebx = 0, ecx = 0, edx = 0}}, {
      cpuid = {eax = 0, ebx = 0, ecx = 0, edx = 256}, usable = {eax = 0, 
        ebx = 0, ecx = 0, edx = 0}}, {cpuid = {eax = 12327, ebx = 0, ecx = 0, 
        edx = 0}, usable = {eax = 0, ebx = 0, ecx = 0, edx = 0}}, {cpuid = {
        eax = 0, ebx = 0, ecx = 0, edx = 0}, usable = {eax = 0, ebx = 0, 
        ecx = 0, edx = 0}}, {cpuid = {eax = 0, ebx = 0, ecx = 0, edx = 0}, 
      usable = {eax = 0, ebx = 0, ecx = 0, edx = 0}}}, preferred = {17719}, 
  xsave_state_size = 960, xsave_state_full_size = 1152, data_cache_size = 0, 
  shared_cache_size = 0, non_temporal_threshold = 0, 
  rep_movsb_threshold = 2048, rep_stosb_threshold = 2048}
(gdb) 

data_cache_size, shared_cache_size, non_temporal_threshold shouldn't be
zero and rep_movsb_threshold should be 4096.

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