#20463: Pari segfault on Sage startup in Cygwin (2)
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Reporter: embray | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.2
Component: porting: Cygwin | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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This is the same issue as #11551, but as that issue was closed several
years ago (with no satisfying resolution) it was suggested I open a new
ticket. The code has changed a little bit since then too. Most notably
as of
[http://git.sagemath.org/sage.git/commit/src/sage/libs/pari/decl.pxi?h=develop&id=ade4f7521ad77c03e9791bc3768d9a9e3a2daca4
ade4f752] there are no longer `bot`, `top` and `avma` global variables in
`paridecl.pxi` (then `decl.pxi`). Now there is a single struct
`pari_mainstack` with these pointers as elements. I don't think that
makes an enormous difference though, but it does change the discussion
somewhat.
Otherwise the !Python/Cython level stacktrace is almost the same as
before. The segfault occurs on
[http://git.sagemath.org/sage.git/tree/src/sage/rings/real_mpfr.pyx?h=976c0f3d0f9f0ac744e535ea734dadf2e7918991#n3138
this line] which I guess happens to be reached the first time any PARI
object is created during import. I haven't debugged deeper than that yet
but I'm guessing it's the same issue as in the original ticket--that the
PARI stack somehow hasn't been initialized yet.
[Incidentally, one thing that did seem to work is cysignals--it caught the
segfault and raised a Python exception for it. So I don't *think*
cysignals is related here but I wouldn't necessarily rule it out either.]
--
Ticket URL: <http://trac.sagemath.org/ticket/20463>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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