[Bug build/28692] New: elf/tst-cpu-features-cpuinfo fails on EPYC-Rome

[Bug build/28692] New: elf/tst-cpu-features-cpuinfo fails on EPYC-Rome

[michael.hudson at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28692

            Bug ID: 28692
           Summary: elf/tst-cpu-features-cpuinfo fails on EPYC-Rome
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: michael.hudson at canonical dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

As can be seen here
(https://launchpad.net/~mwhudson/+archive/ubuntu/devirt/+build/22621733),
elf/tst-cpu-features-cpuinfo fails on the current (fairly new) launchpad
builders. The failure is:

Checking HAS_CPU_FEATURE (WBNOINVD):
  HAS_CPU_FEATURE (WBNOINVD): 1
  cpuinfo (wbnoinvd): 0
 *** failure ***

/proc/cpuinfo is:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 23
model           : 49
model name      : AMD EPYC-Rome Processor
stepping        : 0
microcode       : 0x1000065
cpu MHz         : 2499.998
cache size      : 512 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt pdpe1gb rdtscp
lm rep_good nopl xtopology cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3
fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor
lahf_lm svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext
perfctr_core ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap
clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves clzero xsaveerptr arat
npt nrip_save umip rdpid
bugs            : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
bogomips        : 4999.99
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

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[Bug build/28692] elf/tst-cpu-features-cpuinfo fails on EPYC-Rome

[michael.hudson at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28692

Michael Hudson-Doyle <michael.hudson at canonical dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |michael.hudson at canonical dot co
                   |                            |m

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[Bug build/28692] elf/tst-cpu-features-cpuinfo fails on EPYC-Rome

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=28692

Martin Liska <mliska at suse dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mliska at suse dot cz

--- Comment #1 from Martin Liska <mliska at suse dot cz> ---
I guess it's related to Linux kernel version.
I likely have the very same CPU:

$ cat /proc/cpuinfo | head -n100
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 23
model           : 49
model name      : AMD EPYC 7702 64-Core Processor
stepping        : 0
microcode       : 0x8301025
cpu MHz         : 3343.026
cache size      : 512 KB
physical id     : 0
siblings        : 128
core id         : 0
cpu cores       : 64
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 16
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb
rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf
pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx
f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse
3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext
perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibrs ibpb stibp vmmcall
fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni
xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total
cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd amd_ppin arat npt lbrv
svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter
pfthreshold avic v_vmsave_vmload vgif umip rdpid overflow_recov succor smca
bugs            : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
bogomips        : 3992.68
TLB size        : 3072 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14]

$ uname -a
Linux benzen 5.12.9-1-default #1 SMP Thu Jun 3 07:44:58 UTC 2021 (f17eb01)
x86_64 x86_64 x86_64 GNU/Linux

And as seen, 'wbnoinvd' is present in the flags.

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