segmentation fault: gasdf.c:3237, index out of bound

[Arlindo da Silva]

On Feb 18, 2008 4:40 AM, Ryo Furue <furue at hawaii.edu> wrote:

> Dear GrADS maintainers,
>
> I'd like to report a bug.
>
> For a netCDF file, line 3237
>
>  3237   fgrid[ginx] = fakefgrid[indx] ;
>
> of gasdf.c causes a segmentation fault.  It turns out that ginx
> gets a negative value, which in turn is caused by
>
>  3230   ginx = (gtinx - gridptr->dimmin[GTINDEX]) * zyxsize +
>  3231          (gzinx - gridptr->dimmin[GZINDEX]) * yxsize +
>  3232          (gyinx - gridptr->dimmin[GYINDEX]) * gxsize +
>  3233          (gxinx - gridptr->dimmin[GXINDEX]) ;
>
> where
>
>   gtinx == 1
>   gridptr->dimmin[GTINDEX] == 1
>   gzinx == 1
>   gridptr->dimmin[GZINDEX] == 30
>   gyinx == 1
>   gridptr->dimmin[GYINDEX] == 1
>   gxinx == 1
>   gridptr->dimmin[GXINDEX] == 1
>
> Another, probably related oddity is that GrADS seems to be confused
> about a vertical axis with an attribute 'positive = "down" '.
> Index 1 of my depth coordinate corresponds the shallowest level
> and index 30 corresponds to the deepest.  But, in GrADS, z = 1
> corresponds to the deepest level.  I suspect this is the reason
> for gridptr->dimmin[GZINDEX] == 30 and gzinx == 1 .
>
> Here is how the vertical axis is defined (from ncdump -h):
>
>  float dep(dep) ;
>   dep:units = "meters" ;
>   dep:axis = "Z" ;
>   dep:positive = "down" ;
>
>  dep = 5, 15, 25, 35, 45, 55, 65, 75, 85, 95, 105, 115.9789, 129.7985,
>    148.0428, 171.8625, 201.8625, 238.0428, 279.7985, 325.9789, 375, 425,
>    491.1513, 604.1757, 790.2066, 1068.231, 1448.231, 1930.207, 2504.176,
>    3151.151, 3845 ;
>
> I can send you my netCDF file as well as an instruction on how to
> reproduce the segmentation fault.
>
> I'm using grads-1.9b4 on Linux.
>

Is this bug still in the v1.9.0-rc1 binaries?


http://sourceforge.net/project/showfiles.php?group_id=161773&package_id=182392

--
Arlindo da Silva
dasilva at alum.mit.edu
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