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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#24028: closed (Linux-libre kernel does not build
 deterministically)
Date: Sun, 21 Nov 2021 14:13:01 +0000

[Message part 1 (text/plain, inline)]

Your message dated Sun, 21 Nov 2021 09:12:34 -0500
with message-id <87y25hbnsd.fsf <at> gmail.com>
and subject line Re: bug#24028: Linux-libre kernel does not build deterministically
has caused the debbugs.gnu.org bug report #24028,
regarding Linux-libre kernel does not build deterministically
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
24028: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24028
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Contact help-debbugs <at> gnu.org with problems

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From: ludo <at> gnu.org (Ludovic Courtès)
To: bug-guix <at> gnu.org 
Subject: Linux-libre kernel does not build deterministically
Date: Tue, 19 Jul 2016 19:22:29 +0200

As of version 4.6.4, Linux-libre does not build reproducibly:

--8<---------------cut here---------------start------------->8---
$ 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
--8<---------------cut here---------------end--------------->8---

Apparently people are working on it:
<https://wiki.debian.org/SameKernel>.

Ludo’.

[Message part 3 (message/rfc822, inline)]

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: zimoun <zimon.toutoune <at> gmail.com>
Cc: 24028-done <at> debbugs.gnu.org, Ludovic Courtès <ludo <at> gnu.org>
Subject: Re: bug#24028: Linux-libre kernel does not build deterministically
Date: Sun, 21 Nov 2021 09:12:34 -0500

Hello,

zimoun <zimon.toutoune <at> gmail.com> writes:

> 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

Fixed in 01ea70a29c on core-updates-frozen, after taking hints from
https://lwn.net/Articles/841624/.

Thanks,

Closing.

Maxim

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