On Dec 5, 6:34 am, "Justin C. Walker" <[EMAIL PROTECTED]> wrote:
> Hi, all,
>
> On Dec 4, 2007, at 20:07 , mabshoff wrote:
>
> [snip]
>
> > Those are all cause by mwrank. The issue seems to be the same issue as
> > Justin Walker reported in the 2.8.15 thread in sage-support.
> > Interestingly nobody ever reported it and I now finally have a
> > testcase that also produces the issue on sage.math under valgrind. I
> > have send John Cremona two valgrind traces and hope that it will help
> > to fix the issues.
>
> An update:
>
Hello Justin,
> FWIW, I ran mwrank on the same input as you used for your test, and
> it completed without a peep, at least until I quit.
>
> 'mwrank' doesn't like it if you just exit (by typing "^D" or, more or
> less equivalently, by "ending a file").
>
> Thus, if you run 'mwrank' and give it a file containing, for example,
> "[0,0,1,-1,0]" and nothing else, it will barf at the end. If your
> file contains "[0,0,0,0,0]", the program sweetly closes up shop (when
> it reads this) and quits.
>
> The error I get is
> bad ZZ input
> Abort trap
>
> Anyone know why this doesn't show up in the test logs? Is it worth
> tracking down?
Yep, any crash is worth fixing and I assume it is still present in the
newer cremona.spkg codebase.
> The issue is that the terminating condition for input processing in
> 'getcurve()' is a "null curve" (""[0,0,0,0,0]""), rather than EOF.
> An EOF is an error condition, hence the abort().
>
> A C++ mavin may know how to fix this (I don't). Trac #1403.
Sorry, I overwrote #1402 with what I thought was the real issue until
realizing that your error is an orthogonal crash. The above two tickts
(#1402, #1403) might explain why mwrank on Cygwin behaved really badly
and just crashed more or less randomly. We blamed this on crappy
Cygwin, but the fault may lie somewhere else.
Cheers,
Michael
> Justin
>
> --
> Justin C. Walker, Curmudgeon-At-Large
> Institute for the Absorption of Federal Funds
> --------
> Men are from Earth.
> Women are from Earth.
> Deal with it.
> --------
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