GNU bug report logs - #79369
seq generates wrong sequences for big numbers

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: <ondra007.tom <at> seznam.cz>
To: <bug-coreutils <at> gnu.org>
Subject: seq generates wrong sequences for big numbers
Date: Tue, 02 Sep 2025 14:11:28 +0200 (CEST)

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

It looks like seq for integers bigger than 2^64 sometimes generate wrong 
results. There are few examples of wrong output I have found:


$ seq 18446744073709551617 inf | head -3

18446744073709551616
18446744073709551617
18446744073709551618





$  seq 10000000000000000000000000000 inf | head -3


9999999999999999999731564544
9999999999999999999731564545
9999999999999999999731564546





$  seq -1000000000000000000000000 0 | head -3


-1000000000000000000000000
-1000000000000000000000000
-1000000000000000000000000




It is similar to bug #75994 which reports the same issue but only for "-w"
option.

[Message part 2 (text/html, inline)]

Message #8 received at 79369 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: ondra007.tom <at> seznam.cz, 79369 <at> debbugs.gnu.org
Subject: Re: bug#79369: seq generates wrong sequences for big numbers
Date: Tue, 2 Sep 2025 16:52:50 +0100

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

On 02/09/2025 13:11, ondra007.tom <at> seznam.cz wrote:
> It looks like seq for integers bigger than 2^64 sometimes generate wrong
> results. There are few examples of wrong output I have found:
> 
> 
> $ seq 18446744073709551617 inf | head -3
> 
> 18446744073709551616
> 18446744073709551617
> 18446744073709551618
> 
> 
> 
> 
> 
> $  seq 10000000000000000000000000000 inf | head -3
> 
> 
> 9999999999999999999731564544
> 9999999999999999999731564545
> 9999999999999999999731564546

We can improve for the above 2 cases anyway,
with something like the attached.

Large magnitude negative start values are still problematic.

cheers,
Padraig

[seq-large-start.patch (text/x-patch, attachment)]

Message #13 received at 79369-done <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: ondra007.tom <at> seznam.cz, 79369-done <at> debbugs.gnu.org
Subject: Re: bug#79369: seq generates wrong sequences for big numbers
Date: Tue, 2 Sep 2025 20:53:31 +0100

On 02/09/2025 16:52, Pádraig Brady wrote:
> On 02/09/2025 13:11, ondra007.tom <at> seznam.cz wrote:
>> It looks like seq for integers bigger than 2^64 sometimes generate wrong
>> results. There are few examples of wrong output I have found:
>>
>>
>> $ seq 18446744073709551617 inf | head -3
>>
>> 18446744073709551616
>> 18446744073709551617
>> 18446744073709551618
>>
>>
>>
>>
>>
>> $  seq 10000000000000000000000000000 inf | head -3
>>
>>
>> 9999999999999999999731564544
>> 9999999999999999999731564545
>> 9999999999999999999731564546
> 
> We can improve for the above 2 cases anyway,
> with something like the attached.
> 
> Large magnitude negative start values are still problematic.

Ok I pushed that with a test included:https://github.com/coreutils/coreutils/commit/701416709
Marking this as done.

thanks,
Padraig

Message #16 received at 79369 <at> debbugs.gnu.org (full text, mbox):

From: Collin Funk <collin.funk1 <at> gmail.com>
To: 79369 <at> debbugs.gnu.org
Cc: P <at> draigBrady.com, ondra007.tom <at> seznam.cz
Subject: Re: bug#79369: seq generates wrong sequences for big numbers
Date: Tue, 02 Sep 2025 21:19:42 -0700

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

Pádraig Brady <P <at> draigBrady.com> writes:

>> We can improve for the above 2 cases anyway,
>> with something like the attached.
>> Large magnitude negative start values are still problematic.
>
> Ok I pushed that with a test included:https://github.com/coreutils/coreutils/commit/701416709
> Marking this as done.

Thanks for the fix.

Just pushed this tiny patch to fix a 'make syntax-check' failure.

Collin

[0001-maint-avoid-syntax-check-failure-from-previous-commi.patch (text/x-patch, attachment)]

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