Linux-libre kernel does not build deterministically

DoneSubmitted by Ludovic Courtès.
Details
4 participants
  • Bone Baboon
  • Ludovic Courtès
  • Maxim Cournoyer
  • zimoun
Owner
unassigned
Severity
normal
L
L
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’.
M
M
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
B
B
Bone Baboon wrote on 17 May 20:38 +0200
Re: Linux-libre kernel does not build deterministically
(address . 24028@debbugs.gnu.org)
87im3hcijw.fsf@disroot.org
Linux-libre is not reproducible.
`guix describe` outputs:
```Generation 24 May 12 2021 18:06:24 (current) guix d6aeebb repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: d6aeebb23639258311fdfb9dbf5f903079fde51a```
`guix challenge/gnu/store/k029d836d3slh3s5k20306zvnph5ggq4-linux-libre-5.11.16`outputs:
```/gnu/store/k029d836d3slh3s5k20306zvnph5ggq4-linux-libre-5.11.16 contents differ: local hash: 1xkzhdkqbnh1prryz2bbbz1fsydsb9srhzpj27mpx1dv47fq2r05 https://ci.guix.gnu.org/nar/zstd/k029d836d3slh3s5k20306zvnph5ggq4-linux-libre-5.11.16:0w8n65xr91g9kiwik8kf8h1jn1scwfjcbwwnqbrfiyv8k7gr8kql differing file: /bzImage
1 store items were analyzed: - 0 (0.0%) were identical - 1 (100.0%) differed - 0 (0.0%) were inconclusive```
`guix challenge/gnu/store/rcav1xxn4ajkbnkmrnl6jr5d1zb20kq1-linux-libre-5.11.14`outputs:
```/gnu/store/rcav1xxn4ajkbnkmrnl6jr5d1zb20kq1-linux-libre-5.11.14 contents differ: local hash: 1z2v884l98ysl0vass4dchwfpavnk47x8brcx8h31qp3bj1xyhaz https://ci.guix.gnu.org/nar/zstd/rcav1xxn4ajkbnkmrnl6jr5d1zb20kq1-linux-libre-5.11.14:1nlmjamm0yc2mjwdy0rq7qplilrwz1b8zm4m688kra21xqx09aardiffering file: /bzImage
1 store items were analyzed: - 0 (0.0%) were identical - 1 (100.0%) differed - 0 (0.0%) were inconclusive```
Attached is the diffoscope output.
Z
Z
zimoun wrote on 14 Sep 13:59 +0200
Re: bug#24028: Linux-libre kernel does not build deterministically
(name . Maxim Cournoyer)(address . maxim.cournoyer@gmail.com)
86lf3ztljp.fsf@gmail.com
Hi,
On Fri, 09 Oct 2020 at 17:17, Maxim Cournoyer <maxim.cournoyer@gmail.com> wrote:
Toggle quote (24 lines)> ludo@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
M
M
Maxim Cournoyer wrote on 21 Nov 15:12 +0100
(name . zimoun)(address . zimon.toutoune@gmail.com)
87y25hbnsd.fsf@gmail.com
Hello,
zimoun <zimon.toutoune@gmail.com> writes:
Toggle quote (32 lines)> Hi,>> On Fri, 09 Oct 2020 at 17:17, Maxim Cournoyer <maxim.cournoyer@gmail.com> wrote:>> ludo@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
Fixed in 01ea70a29c on core-updates-frozen, after taking hints fromhttps://lwn.net/Articles/841624/.
Thanks,
Closing.
Maxim
Closed
?
Your comment

Commenting via the web interface is currently disabled.

To comment on this conversation send email to 24028@debbugs.gnu.org