Re: Investigating a reproducibility failure

[Ricardo Wurmus]

Konrad Hinsen <konrad.hinsen@fastmail.net> writes:

> Konrad Hinsen <konrad.hinsen@fastmail.net> writes:
>
>> To see the failure, do
>>
>>    guix time-machine \
>>     --commit=7357b3d7a52eb5db1674012c50d308d792741c48 \
>>     -- build openblas
>>
>> The build log is attached, the first error is
>
> Oops... Two mistakes ! First, I forgot the attachment, so here it comes,
> Second, I didn't quote the right commit. The failure happens with
>
>     guix time-machine \
>      --commit=87e7faa2ae641d8302efc8b90f1e45f43f67f6da \
>      -- build openblas

It builds fine on this laptop.

--8<---------------cut here---------------start------------->8---
$ lscpu
Architecture:            x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Address sizes:         39 bits physical, 48 bits virtual
  Byte Order:            Little Endian
CPU(s):                  4
  On-line CPU(s) list:   0-3
Vendor ID:               GenuineIntel
  Model name:            Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz
    CPU family:          6
    Model:               78
    Thread(s) per core:  2
    Core(s) per socket:  2
    Socket(s):           1
    Stepping:            3
    CPU max MHz:         3100.0000
    CPU min MHz:         400.0000
    BogoMIPS:            5199.98
    Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush dts acpi mmx fxsr ss
                         e sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm 
constant_tsc art arch_perfmon pebs bts rep_good nop
                         l xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq 
dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg 
                         fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe 
popcnt tsc_deadline_timer aes xsave avx f16c rdra
                         nd lahf_lm abm 3dnowprefetch cpuid_fault epb 
invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi
                          flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 
avx2 smep bmi2 erms invpcid mpx rdseed adx sm
                         ap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves 
dtherm ida arat pln pts hwp hwp_notify hwp_act
                         _window hwp_epp md_clear flush_l1d
Virtualization features: 
  Virtualization:        VT-x
Caches (sum of all):     
  L1d:                   64 KiB (2 instances)
  L1i:                   64 KiB (2 instances)
  L2:                    512 KiB (2 instances)
  L3:                    4 MiB (1 instance)
NUMA:                    
  NUMA node(s):          1
  NUMA node0 CPU(s):     0-3
--8<---------------cut here---------------end--------------->8---

CPU detection is a bottomless can of worms.

-- 
Ricardo