Re: Investigating a reproducibility failure

[zimoun]

Hi Konrad,

I get the same error as you.  And for more versions than the only one
your tested.  For instance, for these commits,

* substitutes and rebuilds

923dcc3597 Fri Jan 14 12:59:33 2022 +0100 gnu: iverilog: Update to 11.0.
79ca578182 Thu Nov 11 21:52:08 2021 -0500 gnu: fpc: Fix build.
ab0cf06244 Thu Nov 11 13:35:51 2021 -0500 gnu: rust: Remove #:rust ,rust-1.52 
arguments.
bbd2864272 Sun Dec 27 15:50:08 2020 +0100 gnu: openblas: Update to 0.3.13.


* substitutes but failed rebuilds (--no-grafts --check)

4b1538e6ef Thu Nov 11 12:18:37 2021 -0500 gnu: kexec-tools: Fix build on 
i686-linux.
ade7638d84 Fri Sep 18 14:05:51 2020 +0200 Revert "gnu: openblas: Update to 
0.3.10."
c59e9f0a03 Fri Sep 18 08:57:48 2020 +0200 gnu: openblas: Update to 0.3.10
5969598149 Sat Mar 7 12:48:18 2020 +0100 gnu: openblas: Use HTTPS home page.
2ea095300a Tue Oct 8 21:23:06 2019 +0200 gnu: OpenBLAS: Update to 0.3.7.


* no substitute and failed builds

a4384dc970 Tue Oct 8 21:23:06 2019 +0200 gnu: OpenBLAS: Incorporate grafted 
changes.
ba05be2249 Fri Sep 13 10:50:11 2019 +0200 gnu: openblas: Set 'NUM_THREADS'.
5855756c81 Thu Feb 21 22:04:48 2019 -0600 gnu: openblas: Honor 
parallel-job-count.
602a5ef9f3 Sun Feb 10 21:04:23 2019 +0100 gnu: OpenBLAS: Update to 0.3.5.



Last, note that the time-machine is failing earlier for these commits:

d26584fcda Thu Nov 11 12:18:37 2021 -0500 gnu: binutils-gold: Inherit from 
binutils-next.
ac6f677249 Thu Nov 11 12:18:37 2021 -0500 gnu: Add binutils-next.
661b25a2ed Thu Nov 11 12:18:36 2021 -0500 gnu: openblas: Do not build static 
library.
9e497f44ba Thu Nov 11 12:18:36 2021 -0500 gnu: openblas: Add support for older 
x86 processors.
bd771edd6c Thu Nov 11 12:18:31 2021 -0500 gnu: openblas: Update to 0.3.18
e364758d44 Fri Sep 18 22:26:33 2020 +0200 gnu: openblas: Update to 0.3.10
df5a2e4f83 Thu Mar 5 23:36:05 2020 +0100 gnu: OpenBLAS: Update to 0.3.9
087c94019d Sat Feb 15 22:02:56 2020 +0100 gnu: OpenBLAS: Update to 0.3.8.
e77412362f Sat May 4 16:25:53 2019 +0200 gnu: OpenBLAS: Update to 0.3.6.

which reduces the range for testing.


This bug#51536 is discussing reproducibility of openblas and the
compilation flags.


1: <https://issues.guix.gnu.org/51536>


Cheers,
simon