#20693: Sage crashes when computing newforms
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Reporter: ehlen | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-7.3
Component: modular forms | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by ehlen):
Replying to [comment:16 pbruin]:
> From the traceback it appears that NTL runs out of primes for its FFT-
based `ZZX_XGCD` function. We should catch the NTL error in
`NumberFieldElement._invert_c_()` and use an alternative extended GCD
implementation if that happens.
Indeed, after finally managing to get sage run in gdb on OSX, I get
{{{
#4 0x00000001076cc353 in NTL::UseFFTPrime(long) () from
/Users/stephan/sage/local/lib/libntl.25.dylib
#5 0x00000001077bfaf8 in
NTL::zz_pContext::zz_pContext(NTL::INIT_FFT_STRUCT const&, long) ()
from /Users/stephan/sage/local/lib/libntl.25.dylib
#6 0x00000001077bfd07 in NTL::zz_p::FFTInit(long) () from
/Users/stephan/sage/local/lib/libntl.25.dylib
#7 0x0000000107743dba in NTL::resultant(NTL::ZZ&, NTL::ZZX const&,
NTL::ZZX const&, long) ()
from /Users/stephan/sage/local/lib/libntl.25.dylib
#8 0x0000000107749594 in NTL::XGCD(NTL::ZZ&, NTL::ZZX&, NTL::ZZX&,
NTL::ZZX const&, NTL::ZZX const&, long) ()
from /Users/stephan/sage/local/lib/libntl.25.dylib
#9 0x000000018b253179 in
__pyx_f_4sage_5rings_12number_field_20number_field_element_18NumberFieldElement__invert_c_(__pyx_obj_4sage_5rings_12number_field_20number_field_element_NumberFieldElement*,
NTL::ZZX*, NTL::ZZ*) ()
}}}
Is this a bug in NTL? Is it documented anywhere that this might fail? Can
we know in advance that this will happen so that we don't have to run into
_invert_c_c()?
--
Ticket URL: <http://trac.sagemath.org/ticket/20693#comment:17>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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