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Old 2016-05-08, 05:24   #1
wreck
 
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"Bo Chen"
Oct 2005
Wuhan,China

16710 Posts
Default mi64: inverse does not exist

In the process to log the progress of NFS@Home,
sometimes, I found some WU are lost,
and then I dig it more this day, and found,

https://escatter11.fullerton.edu/nfs...ultid=59210837

Code:
<core_client_version>7.6.22</core_client_version>
<![CDATA[
<message>
Incorrect function.
 (0x1) - exit code 1 (0x1)
</message>
<stderr_txt>
boinc initialized
work files resolved, now working
-> projects/escatter11.fullerton.edu_nfs/lasieve5f_1.11_windows_x86_64.exe
-> -a
-> -f
-> 4340260000
-> -c
-> 10000
-> -R
-> -o
-> ../../projects/escatter11.fullerton.edu_nfs/G2m1285_2_4340260_2_r1523667159_0
-> ../../projects/escatter11.fullerton.edu_nfs/G2m1285.poly
mi64: inverse does not exist
00:24:07 (5608): called boinc_finish

</stderr_txt>
]]>
From,
https://escatter11.fullerton.edu/nfs...?wuid=51982403
This WU has been signed to 6 different computers, and got the same error,
with both Linux and Windows.

When searching the error information form source,
it seems like it come from
lasieve5-20081105\fbgen64.c
line 85 to 98,
Code:
/* uses same auxiliary variables as mm64 */
static u64_t mi64(u64_t x)
{
  if (!mm64_init) 
  {    
    mpz_init(mm64_aux1);
    mpz_init(mm64_aux2);
    mm64_init=1;
  }
  mpz_set_ull(mm64_aux1,x);
  mpz_set_ull(mm64_aux2,mod64);
  if (!mpz_invert(mm64_aux1,mm64_aux1,mm64_aux2))
    Schlendrian("mi64: inverse does not exist\n");
  return mpz_get_ull(mm64_aux1);
}
I have not enough knowledge or time to dig out the reason,
so I pop it out here to others.

ggnfs's source could found at
http://mersenneforum.org/showpost.ph...9&postcount=28
http://www.mersenneforum.org/showpos...28&postcount=1
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Old 2016-05-08, 15:44   #2
chris2be8
 
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Sep 2009

7·172 Posts
Default

A few questions that I hope might help lead someone to the answer:

What is the poly for that job?
What does the job file contain? (LPBA, MFBA, special-Q range etc).
Have any WUs for that job completed successfully? If so what special-Qs worked?

Chris
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