#10099: Sage crashes printing copy of symbolic option inside Pynac.
------------------------+---------------------------------------------------
Reporter: drkirkby | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-4.6
Component: algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
------------------------+---------------------------------------------------
This bug has been seen on several systems. See:
http://groups.google.com/group/sage-
support/browse_thread/thread/ea1de9abbd6ca23d
Here on an !OpenSolaris x86 machine, but also seen on Linux x86 and PPC OS
X 10.4.
{{{
drkir...@hawk:~/sage-4.6.alpha2$ ./sage
----------------------------------------------------------------------
| Sage Version 4.6.alpha2, Release Date: 2010-09-29 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
**********************************************************************
* *
* Warning: this is a prerelease version, and it may be unstable. *
* *
**********************************************************************
sage: copy(x)
------------------------------------------------------------
Unhandled SIGSEGV: A segmentation fault occurred in Sage.
This probably occurred because a *compiled* component
of Sage has a bug in it (typically accessing invalid memory)
or is not properly wrapped with _sig_on, _sig_off.
You might want to run Sage under gdb with 'sage -gdb' to debug this.
Sage will now terminate (sorry).
------------------------------------------------------------
}}}
The bug appears to be in Pynac, as running GDB shows:
{{{
drkir...@hawk:~/sage-4.6.alpha2$ ./sage -gdb
----------------------------------------------------------------------
| Sage Version 4.6.alpha2, Release Date: 2010-09-29 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
**********************************************************************
* *
* Warning: this is a prerelease version, and it may be unstable. *
* *
**********************************************************************
/export/home/drkirkby/sage-4.6.alpha2/local/bin/sage-ipython
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-pc-solaris2.11"...
warning: Lowest section in /lib/libdl.so.1 is .dynamic at 00000074
Python 2.6.4 (r264:75706, Oct 6 2010, 11:29:17)
[GCC 4.5.0] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
warning: Lowest section in /lib/libintl.so.1 is .dynamic at 00000074
warning: Lowest section in /lib/libpthread.so.1 is .dynamic at 00000074
sage: copy(x)
Program received signal SIGSEGV, Segmentation fault.
GiNaC::ex::print (this=0xc38337c, c...@0x8044f84, level=0) at ex.cpp:58
58 ex.cpp: No such file or directory.
in ex.cpp
Current language: auto; currently c++
}}}
The relevent line in the file
{{{./sage-4.6.alpha2/pynac-0.2.0.p5/src/ginac/ex.cpp}}} on line 58, which
is here:
{{{
// public
/** Print expression to stream. The formatting of the output is determined
* by the kind of print_context object that is passed. Possible
formattings
* include ginsh-parsable output (the default), tree-like output for
* debugging, and C++ source.
* @see print_context */
void ex::print(const print_context & c, unsigned level) const
{
bp->print(c, level); /* CRASH CRASH CRASH - This is line 58 */
}
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10099>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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