GNU bug report logs - #46212
ci.guix.gnu.org narinfos with excessive NarSize

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Message #22 received at 46212 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Mathieu Othacehe <othacehe <at> gnu.org>
Cc: 46212 <at> debbugs.gnu.org, Christopher Baines <mail <at> cbaines.net>
Subject: Re: bug#46212: ci.guix.gnu.org narinfos with excessive NarSize
Date: Fri, 19 Feb 2021 16:11:14 +0100

Hi Mathieu,

Did you eventually find out where the negative size comes from?

  https://issues.guix.gnu.org/46212

What should we do in your opinion with database entries that have a
negative size?

Thanks,
Ludo’.

Ludovic Courtès <ludo <at> gnu.org> skribis:

> Christopher Baines <mail <at> cbaines.net> skribis:
>
>> /gnu/store/qln574djfgl8h9glij9id8jips7nnrlw-flightgear-2018.3.5
>> NarSize: 18446744072099351584
>>
>> /gnu/store/qhix6afvy2a6n7hlx4qgdns461p8kdnv-repeat-masker-4.1.1
>> NarSize: 18446744071612438544
>>
>> /gnu/store/wd9z64xpck56xzf52jwlpg8vb610b0ym-repeat-masker-4.1.1
>> NarSize: 18446744071612438544
>
> The key point here is that ‘narSize’ in the database is negative:
>
> sqlite> select * from validpaths where path = '/gnu/store/qhix6afvy2a6n7hlx4qgdns461p8kdnv-repeat-masker-4.1.1';
> 43262123|/gnu/store/qhix6afvy2a6n7hlx4qgdns461p8kdnv-repeat-masker-4.1.1|sha256:33328e16d8d83dcf1a6e031598dbc517aff18e6c7ccd55f7894102bab55fcdb9|1611849907|/gnu/store/rr532q5fmwj1gafdgk6nhxg9khnbsw3z-repeat-masker-4.1.1.drv|-2097113072
>
> The actual nar size in this case is just above 2³¹ so most likely we’re
> seeing a signed integer wrapping error.
>
> I believe this is a very recent regression (the registration data for
> the item above is Jan. 28th); we have older store items with a correct
> ‘narSize’, such as
> <https://ci.guix.gnu.org/nm6w84c9zj3yiylal3dk1sqzxq11sjzw.narinfo>.
>
> Thoughts?
>
> Ludo’.

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