Linux-libre kernel does not build deterministically

OpenSubmitted by Ludovic Courtès.
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2 participants
  • Ludovic Courtès
  • Maxim Cournoyer
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Ludovic Courtès wrote on 19 Jul 2016 19:22
(address . bug-guix@gnu.org)
87lh0xfsq2.fsf@gnu.org
As of version 4.6.4, Linux-libre does not build reproducibly:
Toggle snippet (9 lines)$ 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/tBinary 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.
Ludo’.
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Maxim Cournoyer wrote on 9 Oct 2020 23:17
(name . Ludovic Courtès)(address . ludo@gnu.org)(address . 24028@debbugs.gnu.org)
87imbjqeuo.fsf@gmail.com
Hello,
ludo@gnu.org (Ludovic Courtès) writes:
Toggle quote (15 lines)> 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>.>> Ludo’.
I just tested with linux-libre 5.8.10, and it still suffers fromreproducibility problems, but only for one file:
Toggle snippet (4 lines)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
So, we're not far!
Maxim
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