[Bug libc/27398] Sporadic failures in tst-cpu-features-cpuinfo

["siddhesh at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27398

--- Comment #1 from Siddhesh Poyarekar <siddhesh at sourceware dot org> ---
The failures become deterministic and numerous (18 failures in all) when the
test is run under valgrind.  That may have something to do with valgrind's
emulation but noting it here anyway since it seems relevant.  Importantly,
valgrind does not report any errors.

valgrind --trace-children=yes ./testrun.sh elf/tst-cpu-features-cpuinfo
--direct

<valgrind output snipped since it does not report any errors>

Checking HAS_CPU_FEATURE (ACPI):
  HAS_CPU_FEATURE (ACPI): 1
  cpuinfo (acpi): 1
Checking HAS_CPU_FEATURE (ADX):
  HAS_CPU_FEATURE (ADX): 0
  cpuinfo (adx): 1
 *** failure ***
Checking HAS_CPU_FEATURE (APIC):
  HAS_CPU_FEATURE (APIC): 1
  cpuinfo (apic): 1
Checking HAS_CPU_FEATURE (AES):
  HAS_CPU_FEATURE (AES): 1
  cpuinfo (aes): 1
Checking HAS_CPU_FEATURE (AMX_BF16):
  HAS_CPU_FEATURE (AMX_BF16): 0
  cpuinfo (amx_bf16): 0
Checking HAS_CPU_FEATURE (AMX_INT8):
  HAS_CPU_FEATURE (AMX_INT8): 0
  cpuinfo (amx_int8): 0
Checking HAS_CPU_FEATURE (AMX_TILE):
  HAS_CPU_FEATURE (AMX_TILE): 0
  cpuinfo (amx_tile): 0
Checking HAS_CPU_FEATURE (ARCH_CAPABILITIES):
  HAS_CPU_FEATURE (ARCH_CAPABILITIES): 0
  cpuinfo (arch_capabilities): 1
 *** failure ***
Checking HAS_CPU_FEATURE (AVX):
  HAS_CPU_FEATURE (AVX): 1
  cpuinfo (avx): 1
Checking HAS_CPU_FEATURE (AVX2):
  HAS_CPU_FEATURE (AVX2): 1
  cpuinfo (avx2): 1
Checking HAS_CPU_FEATURE (AVX512_4FMAPS):
  HAS_CPU_FEATURE (AVX512_4FMAPS): 0
  cpuinfo (avx512_4fmaps): 0
Checking HAS_CPU_FEATURE (AVX512_4VNNIW):
  HAS_CPU_FEATURE (AVX512_4VNNIW): 0
  cpuinfo (avx512_4vnniw): 0
Checking HAS_CPU_FEATURE (AVX512_BF16):
  HAS_CPU_FEATURE (AVX512_BF16): 0
  cpuinfo (avx512_bf16): 0
Checking HAS_CPU_FEATURE (AVX512_BITALG):
  HAS_CPU_FEATURE (AVX512_BITALG): 0
  cpuinfo (avx512_bitalg): 0
Checking HAS_CPU_FEATURE (AVX512_IFMA):
  HAS_CPU_FEATURE (AVX512_IFMA): 0
  cpuinfo (avx512ifma): 0
Checking HAS_CPU_FEATURE (AVX512_VBMI):
  HAS_CPU_FEATURE (AVX512_VBMI): 0
  cpuinfo (avx512vbmi): 0
Checking HAS_CPU_FEATURE (AVX512_VBMI2):
  HAS_CPU_FEATURE (AVX512_VBMI2): 0
  cpuinfo (avx512_vbmi2): 0
Checking HAS_CPU_FEATURE (AVX512_VNNI):
  HAS_CPU_FEATURE (AVX512_VNNI): 0
  cpuinfo (avx512_vnni): 0
Checking HAS_CPU_FEATURE (AVX512_VP2INTERSECT):
  HAS_CPU_FEATURE (AVX512_VP2INTERSECT): 0
  cpuinfo (avx512_vp2intersect): 0
Checking HAS_CPU_FEATURE (AVX512_VPOPCNTDQ):
  HAS_CPU_FEATURE (AVX512_VPOPCNTDQ): 0
  cpuinfo (avx512_vpopcntdq): 0
Checking HAS_CPU_FEATURE (AVX512BW):
  HAS_CPU_FEATURE (AVX512BW): 0
  cpuinfo (avx512bw): 0
Checking HAS_CPU_FEATURE (AVX512CD):
  HAS_CPU_FEATURE (AVX512CD): 0
  cpuinfo (avx512cd): 0
Checking HAS_CPU_FEATURE (AVX512ER):
  HAS_CPU_FEATURE (AVX512ER): 0
  cpuinfo (avx512er): 0
Checking HAS_CPU_FEATURE (AVX512DQ):
  HAS_CPU_FEATURE (AVX512DQ): 0
  cpuinfo (avx512dq): 0
Checking HAS_CPU_FEATURE (AVX512F):
  HAS_CPU_FEATURE (AVX512F): 0
  cpuinfo (avx512f): 0
Checking HAS_CPU_FEATURE (AVX512PF):
  HAS_CPU_FEATURE (AVX512PF): 0
  cpuinfo (avx512pf): 0
Checking HAS_CPU_FEATURE (AVX512VL):
  HAS_CPU_FEATURE (AVX512VL): 0
  cpuinfo (avx512vl): 0
Checking HAS_CPU_FEATURE (BMI1):
  HAS_CPU_FEATURE (BMI1): 1
  cpuinfo (bmi1): 1
Checking HAS_CPU_FEATURE (BMI2):
  HAS_CPU_FEATURE (BMI2): 1
  cpuinfo (bmi2): 1
Checking HAS_CPU_FEATURE (CLDEMOTE):
  HAS_CPU_FEATURE (CLDEMOTE): 0
  cpuinfo (cldemote): 0
Checking HAS_CPU_FEATURE (CLFLUSHOPT):
  HAS_CPU_FEATURE (CLFLUSHOPT): 0
  cpuinfo (clflushopt): 1
 *** failure ***
Checking HAS_CPU_FEATURE (CLFSH):
  HAS_CPU_FEATURE (CLFSH): 1
  cpuinfo (clflush): 1
Checking HAS_CPU_FEATURE (CLWB):
  HAS_CPU_FEATURE (CLWB): 0
  cpuinfo (clwb): 0
Checking HAS_CPU_FEATURE (CMOV):
  HAS_CPU_FEATURE (CMOV): 1
  cpuinfo (cmov): 1
Checking HAS_CPU_FEATURE (CMPXCHG16B):
  HAS_CPU_FEATURE (CMPXCHG16B): 1
  cpuinfo (cx16): 1
Checking HAS_CPU_FEATURE (CNXT_ID):
  HAS_CPU_FEATURE (CNXT_ID): 0
  cpuinfo (cnxt_id): 0
Checking HAS_CPU_FEATURE (CORE_CAPABILITIES):
  HAS_CPU_FEATURE (CORE_CAPABILITIES): 0
  cpuinfo (core_capabilities): 0
Checking HAS_CPU_FEATURE (CX8):
  HAS_CPU_FEATURE (CX8): 1
  cpuinfo (cx8): 1
Checking HAS_CPU_FEATURE (DCA):
  HAS_CPU_FEATURE (DCA): 0
  cpuinfo (dca): 0
Checking HAS_CPU_FEATURE (DE):
  HAS_CPU_FEATURE (DE): 1
  cpuinfo (de): 1
Checking HAS_CPU_FEATURE (DEPR_FPU_CS_DS):
  HAS_CPU_FEATURE (DEPR_FPU_CS_DS): 1
  cpuinfo (zero_fcs_fds): 0
 *** missing in /proc/cpuinfo ***
Checking HAS_CPU_FEATURE (DS):
  HAS_CPU_FEATURE (DS): 1
  cpuinfo (dts): 1
Checking HAS_CPU_FEATURE (DS_CPL):
  HAS_CPU_FEATURE (DS_CPL): 1
  cpuinfo (ds_cpl): 1
Checking HAS_CPU_FEATURE (DTES64):
  HAS_CPU_FEATURE (DTES64): 1
  cpuinfo (dtes64): 1
Checking HAS_CPU_FEATURE (EIST):
  HAS_CPU_FEATURE (EIST): 1
  cpuinfo (est): 1
Checking HAS_CPU_FEATURE (ENQCMD):
  HAS_CPU_FEATURE (ENQCMD): 0
  cpuinfo (enqcmd): 0
Checking HAS_CPU_FEATURE (ERMS):
  HAS_CPU_FEATURE (ERMS): 1
  cpuinfo (erms): 1
Checking HAS_CPU_FEATURE (F16C):
  HAS_CPU_FEATURE (F16C): 1
  cpuinfo (f16c): 1
Checking HAS_CPU_FEATURE (FMA):
  HAS_CPU_FEATURE (FMA): 1
  cpuinfo (fma): 1
Checking HAS_CPU_FEATURE (FMA4):
  HAS_CPU_FEATURE (FMA4): 0
  cpuinfo (fma4): 0
Checking HAS_CPU_FEATURE (FPU):
  HAS_CPU_FEATURE (FPU): 1
  cpuinfo (fpu): 1
Checking HAS_CPU_FEATURE (FSGSBASE):
  HAS_CPU_FEATURE (FSGSBASE): 0
  cpuinfo (fsgsbase): 1
 *** failure ***
Checking HAS_CPU_FEATURE (FSRM):
  HAS_CPU_FEATURE (FSRM): 0
  cpuinfo (fsrm): 0
Checking HAS_CPU_FEATURE (FXSR):
  HAS_CPU_FEATURE (FXSR): 1
  cpuinfo (fxsr): 1
Checking HAS_CPU_FEATURE (GFNI):
  HAS_CPU_FEATURE (GFNI): 0
  cpuinfo (gfni): 0
Checking HAS_CPU_FEATURE (HLE):
  HAS_CPU_FEATURE (HLE): 0
  cpuinfo (hle): 0
Checking HAS_CPU_FEATURE (HTT):
  HAS_CPU_FEATURE (HTT): 1
  cpuinfo (ht): 1
Checking HAS_CPU_FEATURE (HYBRID):
  HAS_CPU_FEATURE (HYBRID): 0
  cpuinfo (hybrid): 0
Checking HAS_CPU_FEATURE (IBRS_IBPB):
  HAS_CPU_FEATURE (IBRS_IBPB): 0
  cpuinfo (ibrs): 1
 *** failure ***
Checking HAS_CPU_FEATURE (IBT):
  HAS_CPU_FEATURE (IBT): 0
  cpuinfo (ibt): 0
Checking HAS_CPU_FEATURE (INVARIANT_TSC):
  HAS_CPU_FEATURE (INVARIANT_TSC): 1
  cpuinfo (invariant_tsc): 0
 *** missing in /proc/cpuinfo ***
Checking HAS_CPU_FEATURE (INVPCID):
  HAS_CPU_FEATURE (INVPCID): 1
  cpuinfo (invpcid): 1
Checking HAS_CPU_FEATURE (L1D_FLUSH):
  HAS_CPU_FEATURE (L1D_FLUSH): 0
  cpuinfo (flush_l1d): 1
 *** failure ***
Checking HAS_CPU_FEATURE (LAHF64_SAHF64):
  HAS_CPU_FEATURE (LAHF64_SAHF64): 1
  cpuinfo (lahf_lm): 1
Checking HAS_CPU_FEATURE (LM):
  HAS_CPU_FEATURE (LM): 1
  cpuinfo (lm): 1
Checking HAS_CPU_FEATURE (LWP):
  HAS_CPU_FEATURE (LWP): 0
  cpuinfo (lwp): 0
Checking HAS_CPU_FEATURE (LZCNT):
  HAS_CPU_FEATURE (LZCNT): 1
  cpuinfo (abm): 1
Checking HAS_CPU_FEATURE (MCA):
  HAS_CPU_FEATURE (MCA): 1
  cpuinfo (mca): 1
Checking HAS_CPU_FEATURE (MCE):
  HAS_CPU_FEATURE (MCE): 1
  cpuinfo (mce): 1
Checking HAS_CPU_FEATURE (MD_CLEAR):
  HAS_CPU_FEATURE (MD_CLEAR): 0
  cpuinfo (md_clear): 1
 *** failure ***
Checking HAS_CPU_FEATURE (MMX):
  HAS_CPU_FEATURE (MMX): 1
  cpuinfo (mmx): 1
Checking HAS_CPU_FEATURE (MONITOR):
  HAS_CPU_FEATURE (MONITOR): 1
  cpuinfo (monitor): 1
Checking HAS_CPU_FEATURE (MOVBE):
  HAS_CPU_FEATURE (MOVBE): 1
  cpuinfo (movbe): 1
Checking HAS_CPU_FEATURE (MOVDIRI):
  HAS_CPU_FEATURE (MOVDIRI): 0
  cpuinfo (movdiri): 0
Checking HAS_CPU_FEATURE (MOVDIR64B):
  HAS_CPU_FEATURE (MOVDIR64B): 0
  cpuinfo (movdir64b): 0
Checking HAS_CPU_FEATURE (MPX):
  HAS_CPU_FEATURE (MPX): 0
  cpuinfo (mpx): 1
 *** failure ***
Checking HAS_CPU_FEATURE (MSR):
  HAS_CPU_FEATURE (MSR): 1
  cpuinfo (msr): 1
Checking HAS_CPU_FEATURE (MTRR):
  HAS_CPU_FEATURE (MTRR): 1
  cpuinfo (mtrr): 1
Checking HAS_CPU_FEATURE (NX):
  HAS_CPU_FEATURE (NX): 1
  cpuinfo (nx): 1
Checking HAS_CPU_FEATURE (OSPKE):
  HAS_CPU_FEATURE (OSPKE): 0
  cpuinfo (ospke): 0
Checking HAS_CPU_FEATURE (PAE):
  HAS_CPU_FEATURE (PAE): 1
  cpuinfo (pae): 1
Checking HAS_CPU_FEATURE (PAGE1GB):
  HAS_CPU_FEATURE (PAGE1GB): 1
  cpuinfo (pdpe1gb): 1
Checking HAS_CPU_FEATURE (PAT):
  HAS_CPU_FEATURE (PAT): 1
  cpuinfo (pat): 1
Checking HAS_CPU_FEATURE (PBE):
  HAS_CPU_FEATURE (PBE): 1
  cpuinfo (pbe): 1
Checking HAS_CPU_FEATURE (PCID):
  HAS_CPU_FEATURE (PCID): 1
  cpuinfo (pcid): 1
Checking HAS_CPU_FEATURE (PCLMULQDQ):
  HAS_CPU_FEATURE (PCLMULQDQ): 1
  cpuinfo (pclmulqdq): 1
Checking HAS_CPU_FEATURE (PCONFIG):
  HAS_CPU_FEATURE (PCONFIG): 0
  cpuinfo (pconfig): 0
Checking HAS_CPU_FEATURE (PDCM):
  HAS_CPU_FEATURE (PDCM): 1
  cpuinfo (pdcm): 1
Checking HAS_CPU_FEATURE (PGE):
  HAS_CPU_FEATURE (PGE): 1
  cpuinfo (pge): 1
Checking HAS_CPU_FEATURE (PKS):
  HAS_CPU_FEATURE (PKS): 0
  cpuinfo (pks): 0
Checking HAS_CPU_FEATURE (PKU):
  HAS_CPU_FEATURE (PKU): 0
  cpuinfo (pku): 0
Checking HAS_CPU_FEATURE (POPCNT):
  HAS_CPU_FEATURE (POPCNT): 1
  cpuinfo (popcnt): 1
Checking HAS_CPU_FEATURE (PREFETCHW):
  HAS_CPU_FEATURE (PREFETCHW): 0
  cpuinfo (3dnowprefetch): 1
 *** failure ***
Checking HAS_CPU_FEATURE (PREFETCHWT1):
  HAS_CPU_FEATURE (PREFETCHWT1): 0
  cpuinfo (prefetchwt1): 0
Checking HAS_CPU_FEATURE (PTWRITE):
  HAS_CPU_FEATURE (PTWRITE): 0
  cpuinfo (ptwrite): 0
Checking HAS_CPU_FEATURE (PSE):
  HAS_CPU_FEATURE (PSE): 1
  cpuinfo (pse): 1
Checking HAS_CPU_FEATURE (PSE_36):
  HAS_CPU_FEATURE (PSE_36): 1
  cpuinfo (pse36): 1
Checking HAS_CPU_FEATURE (PSN):
  HAS_CPU_FEATURE (PSN): 0
  cpuinfo (psn): 0
Checking HAS_CPU_FEATURE (RDPID):
  HAS_CPU_FEATURE (RDPID): 0
  cpuinfo (rdpid): 0
Checking HAS_CPU_FEATURE (RDRAND):
  HAS_CPU_FEATURE (RDRAND): 1
  cpuinfo (rdrand): 1
Checking HAS_CPU_FEATURE (RDSEED):
  HAS_CPU_FEATURE (RDSEED): 0
  cpuinfo (rdseed): 1
 *** failure ***
Checking HAS_CPU_FEATURE (RDT_A):
  HAS_CPU_FEATURE (RDT_A): 0
  cpuinfo (rdt_a): 0
Checking HAS_CPU_FEATURE (RDT_M):
  HAS_CPU_FEATURE (RDT_M): 0
  cpuinfo (cqm): 0
Checking HAS_CPU_FEATURE (RDTSCP):
  HAS_CPU_FEATURE (RDTSCP): 1
  cpuinfo (rdtscp): 1
Checking HAS_CPU_FEATURE (RTM):
  HAS_CPU_FEATURE (RTM): 0
  cpuinfo (rtm): 0
Checking HAS_CPU_FEATURE (SDBG):
  HAS_CPU_FEATURE (SDBG): 1
  cpuinfo (sdbg): 1
Checking HAS_CPU_FEATURE (SEP):
  HAS_CPU_FEATURE (SEP): 1
  cpuinfo (sep): 1
Checking HAS_CPU_FEATURE (SERIALIZE):
  HAS_CPU_FEATURE (SERIALIZE): 0
  cpuinfo (serialize): 0
Checking HAS_CPU_FEATURE (SGX):
  HAS_CPU_FEATURE (SGX): 0
  cpuinfo (sgx): 0
Checking HAS_CPU_FEATURE (SGX_LC):
  HAS_CPU_FEATURE (SGX_LC): 0
  cpuinfo (sgx_lc): 0
Checking HAS_CPU_FEATURE (SHA):
  HAS_CPU_FEATURE (SHA): 0
  cpuinfo (sha_ni): 0
Checking HAS_CPU_FEATURE (SHSTK):
  HAS_CPU_FEATURE (SHSTK): 0
  cpuinfo (shstk): 0
Checking HAS_CPU_FEATURE (SMAP):
  HAS_CPU_FEATURE (SMAP): 0
  cpuinfo (smap): 1
 *** failure ***
Checking HAS_CPU_FEATURE (SMEP):
  HAS_CPU_FEATURE (SMEP): 1
  cpuinfo (smep): 1
Checking HAS_CPU_FEATURE (SMX):
  HAS_CPU_FEATURE (SMX): 1
  cpuinfo (smx): 1
Checking HAS_CPU_FEATURE (SS):
  HAS_CPU_FEATURE (SS): 1
  cpuinfo (ss): 1
Checking HAS_CPU_FEATURE (SSBD):
  HAS_CPU_FEATURE (SSBD): 0
  cpuinfo (ssbd): 1
 *** failure ***
Checking HAS_CPU_FEATURE (SSE):
  HAS_CPU_FEATURE (SSE): 1
  cpuinfo (sse): 1
Checking HAS_CPU_FEATURE (SSE2):
  HAS_CPU_FEATURE (SSE2): 1
  cpuinfo (sse2): 1
Checking HAS_CPU_FEATURE (SSE3):
  HAS_CPU_FEATURE (SSE3): 1
  cpuinfo (pni): 1
Checking HAS_CPU_FEATURE (SSE4_1):
  HAS_CPU_FEATURE (SSE4_1): 1
  cpuinfo (sse4_1): 1
Checking HAS_CPU_FEATURE (SSE4_2):
  HAS_CPU_FEATURE (SSE4_2): 1
  cpuinfo (sse4_2): 1
Checking HAS_CPU_FEATURE (SSE4A):
  HAS_CPU_FEATURE (SSE4A): 0
  cpuinfo (sse4a): 0
Checking HAS_CPU_FEATURE (SSSE3):
  HAS_CPU_FEATURE (SSSE3): 1
  cpuinfo (ssse3): 1
Checking HAS_CPU_FEATURE (STIBP):
  HAS_CPU_FEATURE (STIBP): 0
  cpuinfo (stibp): 1
 *** failure ***
Checking HAS_CPU_FEATURE (SVM):
  HAS_CPU_FEATURE (SVM): 0
  cpuinfo (svm): 0
Checking HAS_CPU_FEATURE (SYSCALL_SYSRET):
  HAS_CPU_FEATURE (SYSCALL_SYSRET): 1
  cpuinfo (syscall): 1
Checking HAS_CPU_FEATURE (TBM):
  HAS_CPU_FEATURE (TBM): 0
  cpuinfo (tbm): 0
Checking HAS_CPU_FEATURE (TM):
  HAS_CPU_FEATURE (TM): 1
  cpuinfo (tm): 1
Checking HAS_CPU_FEATURE (TM2):
  HAS_CPU_FEATURE (TM2): 1
  cpuinfo (tm2): 1
Checking HAS_CPU_FEATURE (TRACE):
  HAS_CPU_FEATURE (TRACE): 0
  cpuinfo (intel_pt): 1
 *** failure ***
Checking HAS_CPU_FEATURE (TSC):
  HAS_CPU_FEATURE (TSC): 1
  cpuinfo (tsc): 1
Checking HAS_CPU_FEATURE (TSC_ADJUST):
  HAS_CPU_FEATURE (TSC_ADJUST): 1
  cpuinfo (tsc_adjust): 1
Checking HAS_CPU_FEATURE (TSC_DEADLINE):
  HAS_CPU_FEATURE (TSC_DEADLINE): 1
  cpuinfo (tsc_deadline_timer): 1
Checking HAS_CPU_FEATURE (TSXLDTRK):
  HAS_CPU_FEATURE (TSXLDTRK): 0
  cpuinfo (tsxldtrk): 0
Checking HAS_CPU_FEATURE (UMIP):
  HAS_CPU_FEATURE (UMIP): 0
  cpuinfo (umip): 0
Checking HAS_CPU_FEATURE (VAES):
  HAS_CPU_FEATURE (VAES): 0
  cpuinfo (vaes): 0
Checking HAS_CPU_FEATURE (VME):
  HAS_CPU_FEATURE (VME): 1
  cpuinfo (vme): 1
Checking HAS_CPU_FEATURE (VMX):
  HAS_CPU_FEATURE (VMX): 1
  cpuinfo (vmx): 1
Checking HAS_CPU_FEATURE (VPCLMULQDQ):
  HAS_CPU_FEATURE (VPCLMULQDQ): 0
  cpuinfo (vpclmulqdq): 0
Checking HAS_CPU_FEATURE (WAITPKG):
  HAS_CPU_FEATURE (WAITPKG): 0
  cpuinfo (waitpkg): 0
Checking HAS_CPU_FEATURE (WBNOINVD):
  HAS_CPU_FEATURE (WBNOINVD): 0
  cpuinfo (wbnoinvd): 0
Checking HAS_CPU_FEATURE (X2APIC):
  HAS_CPU_FEATURE (X2APIC): 1
  cpuinfo (x2apic): 1
Checking HAS_CPU_FEATURE (XFD):
  HAS_CPU_FEATURE (XFD): 0
  cpuinfo (xfd): 0
Checking HAS_CPU_FEATURE (XGETBV_ECX_1):
  HAS_CPU_FEATURE (XGETBV_ECX_1): 0
  cpuinfo (xgetbv1): 1
 *** failure ***
Checking HAS_CPU_FEATURE (XOP):
  HAS_CPU_FEATURE (XOP): 0
  cpuinfo (xop): 0
Checking HAS_CPU_FEATURE (XSAVE):
  HAS_CPU_FEATURE (XSAVE): 1
  cpuinfo (xsave): 1
Checking HAS_CPU_FEATURE (XSAVEC):
  HAS_CPU_FEATURE (XSAVEC): 0
  cpuinfo (xsavec): 1
 *** failure ***
Checking HAS_CPU_FEATURE (XSAVEOPT):
  HAS_CPU_FEATURE (XSAVEOPT): 0
  cpuinfo (xsaveopt): 1
 *** failure ***
Checking HAS_CPU_FEATURE (XSAVES):
  HAS_CPU_FEATURE (XSAVES): 0
  cpuinfo (xsaves): 1
 *** failure ***
Checking HAS_CPU_FEATURE (XTPRUPDCTRL):
  HAS_CPU_FEATURE (XTPRUPDCTRL): 1
  cpuinfo (xtpr): 1
18 differences between /proc/cpuinfo and glibc code.

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