Discussion related to cado-nfs

[paul zimmermann <Paul.Zimmermann@inria.fr>]

       Dear Sudarshan,

> From: Sudarshan Muralidhar <smural@seas.upenn.edu>
> Date: Wed, 10 Dec 2014 10:13:05 +0000
> 
> Hello,
> 
> I'm using CADO-NFS to update Nadia Heninger's Factoring as a Service
> Project.
> 
> When using CADO in distributed mode to factor numbers, I have no issue for
> numbers below ~100 digits. However, when I try larger digits (RSA-120, for
> example), I get failed workunits, eventually leading to an aborted job.
> My error message is listed below - does it lend any insight to something I
> may be doing wrong?
> 
> Thanks,
> Sudarshan Muralidhar
> 
> Error:Polynomial Selection (size optimized): Program run on node015 failed
> with exit code 134
> Error:Polynomial Selection (size optimized): Stderr output follows (stored
> in file /job10/c120.upload/c120_polyselect1_220000-224000.u2mm_t.stderr0):
> b'# Warning: this code is experimental, and not thread-safe.
> code BUG() : condition newsize == size failed in insert_hash at
> /home/cado-nfs/polyselect/auxiliary.c:3073 -- Abort
> Aborted (core dumped)
> Error:Polynomial Selection (size optimized): Exceeded maximum number of
> failed workunits, maxfailed=100

this is a known issue. The new polynomial selection code is not thread safe.
You should add tasks.polyselect.threads=1 on the cadofactor.py command line.

Best regards,
Paul Zimmermann