GNU bug report logs - #24028
Linux-libre kernel does not build deterministically

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From: zimoun <zimon.toutoune <at> gmail.com>
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: Ludovic Courtès <ludo <at> gnu.org>, 24028 <at> debbugs.gnu.org
Subject: bug#24028: Linux-libre kernel does not build deterministically
Date: Tue, 14 Sep 2021 13:59:38 +0200

Hi,

On Fri, 09 Oct 2020 at 17:17, Maxim Cournoyer <maxim.cournoyer <at> gmail.com> wrote:
> ludo <at> gnu.org (Ludovic Courtès) writes:
>
>> As of version 4.6.4, Linux-libre does not build reproducibly:
>>
>> $ guix challenge linux-libre
>> /gnu/store/wkdnd1dcgljr0jxmd3li8j0qsr2zwrci-linux-libre-4.6.4 contents differ:
>>   local hash: 1py214sd42qcq8l429m4zf4aibp8rl68kpkrzqi1nn65vnbxsx11
>>   https://hydra.gnu.org/nar/wkdnd1dcgljr0jxmd3li8j0qsr2zwrci-linux-libre-4.6.4:
>> 19hsdsjy5i9nfc1g28s074znzimzhylgkdpwz435j301sn9pxxp9
>> $ wget -q -O -
>> https://hydra.gnu.org/nar/wkdnd1dcgljr0jxmd3li8j0qsr2zwrci-linux-libre-4.6.4
>> | bunzip2 | guix archive -x t
>> $ diff -ur --no-dereference /gnu/store/wkdnd1dcgljr0jxmd3li8j0qsr2zwrci-linux-libre-4.6.4 /tmp/t
>> Binary files /gnu/store/wkdnd1dcgljr0jxmd3li8j0qsr2zwrci-linux-libre-4.6.4/bzImage and /tmp/t/bzImage differ
>>
>> Apparently people are working on it:
>> <https://wiki.debian.org/SameKernel>.
>
> I just tested with linux-libre 5.8.10, and it still suffers from
> reproducibility problems, but only for one file:
>
> diff -r /gnu/store/jc1dydmax5sdfljpi5mq5dhq9wdr92xy-linux-libre-5.8.10{,-check}
> Binary files /gnu/store/jc1dydmax5sdfljpi5mq5dhq9wdr92xy-linux-libre-5.8.10/bzImage and /gnu/store/jc1dydmax5sdfljpi5mq5dhq9wdr92xy-linux-libre-5.8.10-check/bzImage differ

Still the same issue with 5.13.15.

diff -r --no-dereference /gnu/store/y9r7physjpa23znb7r6rg38wpmxrkp0s-linux-libre-5.13.15{,-check}
Binary files /gnu/store/y9r7physjpa23znb7r6rg38wpmxrkp0s-linux-libre-5.13.15/bzImage and /gnu/store/y9r7physjpa23znb7r6rg38wpmxrkp0s-linux-libre-5.13.15-check/bzImage differ


All the best,
simon

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