Bug#1138625: golang-github-klauspost-reedsolomon FTBFS due to CPU feature miss detection

[Jochen Sprickerhof]

Source: golang-github-klauspost-reedsolomon
Version: 1.14.0-1
Severity: normal
Tags: ftbfs
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org
User: reproducible-builds at lists.alioth.debian.org
Usertags: cpu

Hi,

golang-github-klauspost-reedsolomon currently fails to build on
https://reproduce.debian.net/:

https://reproduce.debian.net/all/forky.html#golang-github-klauspost-reedsolomon-dev

>From my investigation this seems to due to calling:

vgf2p8affineqb $0x0,%zmm0,%zmm8,%zmm6

But the host system CPU does not support this function:

$ lscpu
Architecture:                x86_64
  CPU op-mode(s):            32-bit, 64-bit
  Address sizes:             40 bits physical, 48 bits virtual
  Byte Order:                Little Endian
CPU(s):                      16
  On-line CPU(s) list:       0-15
Vendor ID:                   GenuineIntel
  Model name:                Intel Xeon Processor (Skylake, IBRS)
    CPU family:              6
    Model:                   85
    Thread(s) per core:      2
    Core(s) per socket:      8
    Socket(s):               1
    Stepping:                4
    BogoMIPS:                4199.99
    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 pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid tsc_known_freq pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave a
                             vx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch cpuid_fault pti ssbd ibrs ibpb stibp tpr_shadow flexpriority ept vpid ept_ad fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 arat vnmi m
                             d_clear arch_capabilities
Virtualization features:
  Virtualization:            VT-x
  Hypervisor vendor:         Microsoft
  Virtualization type:       full
Caches (sum of all):
  L1d:                       256 KiB (8 instances)
  L1i:                       256 KiB (8 instances)
  L2:                        32 MiB (8 instances)
NUMA:
  NUMA node(s):              1
  NUMA node0 CPU(s):         0-15
Vulnerabilities:
  Gather data sampling:      Unknown: Dependent on hypervisor status
  Indirect target selection: Mitigation; Aligned branch/return thunks
  Itlb multihit:             Not affected
  L1tf:                      Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
  Mds:                       Mitigation; Clear CPU buffers; SMT Host state unknown
  Meltdown:                  Mitigation; PTI
  Mmio stale data:           Vulnerable: Clear CPU buffers attempted, no microcode; SMT Host state unknown
  Reg file data sampling:    Not affected
  Retbleed:                  Mitigation; IBRS
  Spec rstack overflow:      Not affected
  Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
  Spectre v1:                Mitigation; usercopy/swapgs barriers and __user pointer sanitization
  Spectre v2:                Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI SW loop, KVM SW loop
  Srbds:                     Not affected
  Tsa:                       Not affected
  Tsx async abort:           Mitigation; Clear CPU buffers; SMT Host state unknown
  Vmscape:                   Not affected

Can you please fix the CPU feature detection?

Thanks!

Jochen

-- System Information:
Debian Release: forky/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 7.0.10+deb14-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled