Discussion related to cado-nfs

[Pierrick Gaudry <pierrick.gaudry@loria.fr>]

Hi,

Which version of cado-nfs did you use? The 2.0 or a recent git version ?

At first sight, it seems that the error comes from a corrupted relation
file. Maybe running 
  cd /tmp/cado.r1psyafiQA/c127.upload/
  for i in c127.sieving.*; do gzip -t $i; done
will reveal a file that is not well formed.
If you put a tarball of your /tmp/cado.r1psyafiQA/ directory
somewhere for download, I can have a look.

You are not the first one who experienced problem with bad relation
files. But it is hard to tell whether this is a bug in Cado-nfs, or a
problem with disks... 

Maybe we should add more checks that the files are correctly written to
disk and that the compression did well.

Regards,
Pierrick


On Sat, Mar 01, 2014 at 10:29:43AM +0800, Sam Stoelinga wrote:
> Hi,
> 
> 
> I get the following error while trying to factor:
> 
> gzip: stdin: invalid compressed data--format violated
> filter_rels_producer_thread: load error (Bad file descriptor) from
> 
> It tries to execute this command it seems:
> ......... many more filesl_2ed.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.19687000-19690000.yr6eid.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.15931000-15934000.s9b_08.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.20965000-20968000.zo24c6.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.10804000-10807000.jszv9k.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.15352000-15355000.bpjgj5.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.23434000-23437000.u7_2tw.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.22465000-22468000.c21z8k.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.10699000-10702000.gq01be.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.21277000-21280000.o38532.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.15889000-15892000.as2trp.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.10231000-10234000.1sv89b.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.19729000-19732000.li0pv7.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.22060000-22063000.3_pxqo.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.15025000-15028000.sptcun.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.15217000-15220000.s5pszl.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.16585000-16588000.0q5cw7.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.22057000-22060000.efhup3.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.17077000-17080000.7jnsok.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.20683000-20686000.bdzp9e.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.18061000-18064000.4ybs_h.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.20785000-20788000.5ehwy1.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.18913000-18916000.xt3ama.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.15985000-15988000.ypj3cw.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.12790000-12793000.6lb_cc.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.10537000-10540000.3vbz_n.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.21955000-21958000.eyqdof.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.23818000-23821000.mht30j.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.16324000-16327000.4imyz7.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.17479000-17482000.685wuc.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.16504000-16507000.9sosap.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.23845000-23848000.ze28d6.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.21811000-21814000.zwhazw.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.15631000-15634000.x887_u.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.16942000-16945000.6htns3.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.12475000-12478000.aphbum.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.23674000-23677000.9wx6nt.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.21424000-21427000.pfh974.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.21874000-21877000.2imoc1.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.17326000-17329000.q4j94g.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.10894000-10897000.f0nc93.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.17944000-17947000.v9uz6n.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.20047000-20050000.kyuqxn.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.19468000-19471000.on99v0.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.16534000-16537000.g273_e.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.18736000-18739000.wtama2.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.17053000-17056000.eucwjm.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.22261000-22264000.m3mjz8.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.17353000-17356000.krizj8.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.13408000-13411000.paz5qu.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.17134000-17137000.3y1mfj.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.11803000-11806000.wlkoak.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.22570000-22573000.c43yts.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.14566000-14569000.gathsf.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.14575000-14578000.ff1a_4.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.19345000-19348000.gi8953.gz
> /tmp/cado.r1psyafiQA/c127.upload/c127.sieving.17836000-17839000.f6cc26.gz |
> gzip -dc -
> 
> Any help would be greatly appreciated! I can provide more info as needed.
> 
> Context: I'm using Cado-nfs to decrypt files which were encrypted by some
> malware following this guide:
> http://blog.cassidiancybersecurity.com/post/2014/02/Bitcrypt-broken
> I'm doing this for a friend.
> 
> Params used:
> slaves.basepath = /tmp/cado.r1psyafiQA/client/
> slaves.hostnames = localhost
> slaves.nrclients = 20
> slaves.niceness = 10
> slaves.scriptpath = /usr/libexec/cado-nfs/bin
> name = c127
> rlim = 5000000
> server.address = localhost
> N =
> 6197414403066148465767611830477972406781444626901692539671142017622145058977671120729249030073292775561014115285376040234795763
> alim = 10000000
> lpba = 27
> tasks.merge.coverNmax = 100
> tasks.execpath = /usr/libexec/cado-nfs/bin
> tasks.sieve.rels_wanted = 15500000
> tasks.sieve.mfba = 81
> tasks.sieve.mfbr = 54
> tasks.sieve.rlambda = 2.1
> tasks.sieve.qrange = 3000
> tasks.sieve.qmin = 10000000
> tasks.sieve.alambda = 2.8
> tasks.sieve.I = 12
> tasks.linalg.bwc.interval = 1000
> tasks.linalg.bwc.interleaving = 0
> tasks.linalg.bwc.mn = 64
> tasks.linalg.bwc.shuffled_product = 1
> tasks.linalg.characters.nchar = 50
> tasks.filter.merge.forbw = 3
> tasks.filter.purge.keep = 160
> tasks.filter.ratio = 1.1
> tasks.filter.maxlevel = 20
> tasks.threads = 1
> tasks.polyselect.incr = 60
> tasks.polyselect.maxnorm = 41.7
> tasks.polyselect.incr = 60
> tasks.polyselect.maxnorm = 41.7
> tasks.polyselect.admax = 2000000
> tasks.polyselect.degree = 5
> tasks.polyselect.adrange = 20000
> tasks.polyselect.P = 50000
> tasks.polyselect.nq = 1000
> tasks.workdir = /tmp/cado.r1psyafiQA
> lpbr = 27

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