Discussion related to cado-nfs

[Emmanuel Thomé <Emmanuel.Thome@inria.fr>]

Bernardo,

Your bug is now fixed by
https://gitlab.inria.fr/cado-nfs/cado-nfs/-/merge_requests/12 .

See https://gitlab.inria.fr/cado-nfs/cado-nfs/-/issues/30009 for the
comments on the issue.

A big THANK YOU for your bug report. As amazing as it may be, this bug in
sqrt has been here from day one.

E.

On Wed, Oct 14, 2020 at 10:52:42PM +0200, Bernardo Boncompagni wrote:
> Hi all, while factoring the
> C112 
> 1145063074027333577715575387634140159952540179532347720181468319839131063022310865763671680437175978656489571651
> the attached error occurred, with both builds Oct 14 11:35 and Sep 28 11:32
> GMT.
> 
> I uploaded the files I deemed relevant here <http://redgolpe.com/cado.zip>,
> please let me know if you need more.
> 
> Thank you for your time,
>     Bernardo Boncompagni
> 
> ===== Error follows =====
> 
> PID176306 2020-10-14 21:51:59,419 Command:Command:
> /home/ubuntu/cado-nfs/build/ip-172-31-39-108/sqrt/sqrt -poly
> nfsdata/c110.poly -prefix nfsdata/c110.dep.gz -dep 0 -t 8 -side0 -side1
> -gcd > nfsdata/c110.sqrt.stdout.2 2> nfsdata/c110.sqrt.stderr.2
> PID176306 2020-10-14 21:52:37,700 Warning:Command: Process with PID 198078
> finished with return code -6
> PID176306 2020-10-14 21:52:37,702 Error:Square Root: Program run on server
> failed with exit code -6
> PID176306 2020-10-14 21:52:37,702 Error:Square Root: Command line was:
> /home/ubuntu/cado-nfs/build/ip-172-31-39-108/sqrt/sqrt -poly
> nfsdata/c110.poly -prefix nfsdata/c110.dep.gz -dep 0 -t 8 -side0 -side1
> -gcd > nfsdata/c110.sqrt.stdout.2 2> nfsdata/c110.sqrt.stderr.2
> PID176306 2020-10-14 21:52:37,702 Error:Square Root: Stderr output (last 10
> lines only) follow (stored in file nfsdata/c110.sqrt.stderr.2):
> PID176306 2020-10-14 21:52:37,702 Error:Square Root:    Alg(5): square root
> is:
> 555287643083995264499635032445532219388774606091985323176085691206366910433807483650449454541347080611266564030
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:    Alg(5): square root
> completed at 284.07s (wct 37.56s)
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:    Alg(0): maximal
> sqrt bit-size = 16273947 (100% of target size)
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:    Alg(0): square root
> lifted at 284.09s (wct 37.58s)
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:    Alg(0): square root
> is:
> 516153508739556589022977937011401702913240008517589239368972163227789864034619173427530095526015988391446136082
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:    Alg(0): square root
> completed at 284.11s (wct 37.65s)
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:    Bug: the squares do
> not agree modulo n!
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:    terminate called
> after throwing an instance of 'std::runtime_error'
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:      what():  code
> BUG() : condition 0 failed at /home/ubuntu/cado-nfs/sqrt/sqrt.cpp:1510
> PID176306 2020-10-14 21:52:37,703 Error:Square Root:

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