* bug#70943: linux-libre is not reproducible (regression)
@ 2024-05-14 15:40 Maxim Cournoyer
2024-05-26 18:15 ` Maxim Cournoyer
0 siblings, 1 reply; 2+ messages in thread
From: Maxim Cournoyer @ 2024-05-14 15:40 UTC (permalink / raw)
To: 70943
Hello,
I've investigated non-determinism in our linux-libre package, which
sadly appears to have regressed in that regard since I last looked into
it 3 years ago (see commit 01ea70a29c5c1ded31c37ce8c43192bc1956b2ca
("gnu: linux-libre: Make build reproducible.")).
I'm currently seeing these differing files:
--8<---------------cut here---------------start------------->8---
$ diff -ql /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9{,-check}
Files /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9/bzImage and /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9-check/bzImage differ
Common subdirectories: /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9/lib and /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9-check/lib
Common subdirectories: /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9/share and /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9-check/share
Files /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9/System.map and /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9-check/System.map differ
--8<---------------cut here---------------end--------------->8---
I'll take a look at what Yocto does differently, if anything.
--
Thanks,
Maxim
^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#70943: linux-libre is not reproducible (regression)
2024-05-14 15:40 bug#70943: linux-libre is not reproducible (regression) Maxim Cournoyer
@ 2024-05-26 18:15 ` Maxim Cournoyer
0 siblings, 0 replies; 2+ messages in thread
From: Maxim Cournoyer @ 2024-05-26 18:15 UTC (permalink / raw)
To: 70943
Hi,
Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
> Hello,
>
> I've investigated non-determinism in our linux-libre package, which
> sadly appears to have regressed in that regard since I last looked into
> it 3 years ago (see commit 01ea70a29c5c1ded31c37ce8c43192bc1956b2ca
> ("gnu: linux-libre: Make build reproducible.")).
>
> I'm currently seeing these differing files:
>
> $ diff -ql /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9{,-check}
> Files /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9/bzImage and /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9-check/bzImage differ
> Common subdirectories: /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9/lib and /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9-check/lib
> Common subdirectories: /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9/share and /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9-check/share
> Files /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9/System.map and /gnu/store/6vx6vkranmggv690ggm79zhdhwvmbji9-linux-libre-6.8.9-check/System.map differ
>
> I'll take a look at what Yocto does differently, if anything.
I didn't see anything special, although some BPF switches got turned on
in the kernel by default in newer 6.X releases, and BPF appears to
introduce non-determinism, accordingy to the Reproducible Builds website
which says this [0]:
Several distributions noticed recent versions of the Linux Kernel are
no longer reproducible because the BPF Type Format (BTF) metadata is
not generated in a deterministic way. This was discussed on the
#reproducible-builds IRC channel, but no solution appears to be in
sight for now.
[0] https://reproducible-builds.org/reports/2023-04/
So it seems there'll need to be some reproducibility work for that
feature in the kernel before it can be resolved (we could also disable
all BPF features, but that seems counter-current at this point in time).
--
Thanks,
Maxim
^ permalink raw reply [flat|nested] 2+ messages in thread
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2024-05-14 15:40 bug#70943: linux-libre is not reproducible (regression) Maxim Cournoyer
2024-05-26 18:15 ` Maxim Cournoyer
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