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: ludo <at> gnu.org (Ludovic Courtès)
Subject: bug#24028: closed (Re: bug#24028: Linux-libre kernel does not
 build deterministically)
Date: Sun, 21 Nov 2021 14:13:02 +0000

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

Your bug report

#24028: Linux-libre kernel does not build deterministically

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 24028 <at> debbugs.gnu.org.

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

[Message part 2 (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

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

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’.

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