#20463: Pari segfault on Sage startup in Cygwin (2)
-------------------------------------+-------------------------------------
Reporter: embray | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.2
Component: porting: Cygwin | Resolution:
Keywords: cygwin windows | Merged in:
Authors: Erik Bray | Reviewers:
Report Upstream: Reported | Work issues:
upstream. No feedback yet. | Commit:
Branch: u/embray/pari- | d0ca39615c9d83ed76e9ab0916925b35d9131183
mmap-cygwin | Stopgaps:
Dependencies: |
-------------------------------------+-------------------------------------
Changes (by {'newvalue': u'Erik Bray', 'oldvalue': ''}):
* status: new => needs_review
* author: => Erik Bray
* branch: => u/embray/pari-mmap-cygwin
* upstream: N/A => Reported upstream. No feedback yet.
* keywords: => cygwin windows
* commit: => d0ca39615c9d83ed76e9ab0916925b35d9131183
Comment:
I have discovered what I think is the cause of this issue, and have
reported it upstream--I believe it to be an issue in Cygwin:
https://cygwin.com/ml/cygwin/2016-05/msg00140.html
I've attached a workaround for the issue from the Sage end. I'm not
terribly happy with it, because if I understand correctly PARI will
automatically grow its stack size as needed, and if it grows beyond 4GB
this bug ''could'' still occur (though I haven't tested this yet--anyone
want to suggest to me a good way to test it?)
I'm not sure how best to work around that though without completely taking
over PARI's stack management. Probably fine just to leave it as a known
issue until there's a fix in Cygwin. It's more important that we don't
immediately segfault as soon as the first PARI number is created.
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=d0ca39615c9d83ed76e9ab0916925b35d9131183
d0ca396]||{{{Workaround for Segfault during start up due to PARI's stack
size being made too large for Cygwin (due to a bug in Cygwin; see
http://trac.sagemath.org/ticket/20463)}}}||
--
Ticket URL: <http://trac.sagemath.org/ticket/20463#comment:1>
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