segfault in degenerate matrix multiply

[williamstein]

OUCH:

wstein@sage:~$ sage
----------------------------------------------------------------------
| Sage Version 3.4.1, Release Date: 2009-04-21                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
matrix(QQ,2,0)sage: matrix(QQ,2,0)*matrix(QQ,0,2)


------------------------------------------------------------
Unhandled SIGSEGV: A segmentation fault occured in SAGE.
This probably occured 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).
------------------------------------------------------------

Component: linear algebra

Issue created by migration from https://trac.sagemath.org/ticket/5972

[sagetrac-mabshoff]

Attachment: trac_5972.patch.gz

William's patch rebased

[sagetrac-mabshoff]

comment:1

Nice catch.

Cheers,

Michael

[sagetrac-mabshoff]

comment:2

Merged in Sage 3.4.2.final.

Cheers,

Michael

[williamstein]

the rebased patch michael posted doesn't work for me on 3.4.2.rc0, but this patch does, so I'm posting it.

[williamstein]

Attachment: trac_5972-3.4.2.rc0.patch.gz