[postgis-users] Postgis on Solaris - gdb details

[strk at refractions.net]

I've went through the code and made sure 'unsigned char' is used
wherever 'octet' is actually meant. 

See if this fixes your problem.

For all users testing RC releases: please give current CVS a check.

--strk;

On Thu, Feb 10, 2005 at 10:28:03AM +0100, strk at refractions.net wrote:
> On Wed, Feb 09, 2005 at 07:07:53PM -0800, Ionut Iordache wrote:
> > Hello,
> > 
> > I found a more specific reason why my installation crashes:
> > 
> > Following is an excerpt from running gdb against the backend and
> > breaking at a point close to where it crashes after executing " select
> > X(geom) from gtest;":
> > 
> > ----------------------------------------------------------------------
> > Breakpoint 2, LWGEOM_x_point (fcinfo=0xffbed600) at lwgeom_ogc.c:528
> > 528             if ( point == NULL ) PG_RETURN_NULL();
> > (gdb) print point
> > $1 = (LWPOINT *) 0x37f188
> > (gdb) print point->point
> > $2 = (POINTARRAY *) 0x37f248
> > (gdb) print point->point->dims
> > $3 = 0 '\0'
> > (gdb) print point->point->npoints
> > $4 = 1
> > (gdb) n
> > 531             p = (POINT2D *)getPoint(point->point, 0);
> > (gdb) print p
> > Cannot access memory at address 0xfffffff0
> > (gdb) n
> > 533             PG_RETURN_FLOAT8(p->x);
> > (gdb) n
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > LWGEOM_x_point (fcinfo=0xffbed600) at lwgeom_ogc.c:533
> > 533             PG_RETURN_FLOAT8(p->x);
> > (gdb) 
> > ------------------------------------------------------------------
> > 
> > My understanding is that the POINTARRAY structure passed to the "getPoint"
> > function is somehow invalid... One obvious thing that I noticed (and I
> > might be way off track here, it's my first time reading through this
> > code...) is that the dimension is always 0, where this is noted in
> > the source files:
> > 
> > /size of point represeneted in the POINTARRAY
> > // 16 for 2d, 24 for 3d, 32 for 4d
> > int
> > pointArray_ptsize(const POINTARRAY *pa)
> > {
> >         return sizeof(double)*TYPE_NDIMS(pa->dims);
> > }
> > 
> > I also tested with LINESTRING and pointArray_ptsize will always return
> > 0 here...
> > 
> 
> POINTARRAY.dims is used as a bitfield for hasZ and hasM flags. 0==2d.
> Can you print value of pa->serialized_pointlist ?
> Return from getPoint should be an offset from there
> (+16*pointN for a 2d ptarray, same address X)
> --strk;
> 
> 
> > 
> > Any help is greatly appreciated!
> > 
> > 
> > Tuesday, February 8, 2005, 2:40:23 PM, you wrote:
> > 
> > II> Hello,
> > 
> > II> I've been having problems for a while with Postgis on Solaris 8
> > II> (sparc). I have tried various combinations of Postgresql 8.0.1, 7.4.6
> > II> with Postgis versions 0.9.1 and up.
> > II> The problem is that after the packages compile relatively without
> > II> hassle, I can't use any postgis spatial function without crashing the
> > II> database.
> > II> For example, I create an empty database, add the lwpostgis.sql
> > II> extension, create a spatial table with point geometry, insert one row
> > II> into the table... up to this point everything is fine... when I run
> > II> "select astext(geom) ..." the point shows up correctly, but when I
> > II> execute "select X(geom) ..." the backend crashes:
> > 
> > 
> > II> server closed the connection unexpectedly
> > II>          This probably means the server terminated abnormally
> > II>          before or while processing the request.
> > II> The connection to the server was lost. Attempting reset: Failed
> > 
> > 
> > II> I compiled with LDFLAGS="-lstdc++ -lgcc" and gcc  3.4.1.
> > II> My gcc installation is configured as follows:
> > II> Reading specs from
> > II> /a/perry/data/pkgs3/local/bin/../lib/gcc/sparc-sun-solaris2.8/3.4.1/specs
> > II> Configured with: ../configure --with-as=/usr/ccs/bin/as
> > II> --with-ld=/usr/ccs/bin/ld --disable-nls
> > II> Thread model: posix
> > II> gcc version 3.4.1
> > 
> > II> The compiler uses Sun's linker and I was wondering if this is part of
> > II> the problem... When I try to compile with GNU's ld, I get a
> > II> "option -dn and -P are incompatible" linker error.
> > 
> > II> The logs are not showing anything interesting, even with the highest
> > II> debug option set...
> > II> I also tried to debug the backend, but I get this error in gdb:
> > II>   Reading symbols from /usr/local/lib/libstdc++.so.6...Error
> > II> while reading shared library symbols:
> > II>   Dwarf Error: Cannot handle DW_FORM_strp in DWARF reader.
> > 
> > 
> > 
> > II> So, is anyone else using lwgeom Postgis on Solaris 8? Did you compile
> > II> gcc from scratch, or used the binaries from sunfreeware.com ?
> > II> Any ideas of what might go wrong with my installation?
> > 
> > 
> > II> Many thanks,
> > II> -----------------------------------------------
> > II> Dorel Ionut Iordache - <ionut at eps.berkeley.edu>
> > II> UC Berkeley - Earth & Planetary Science Dept.
> > 
> > II> _______________________________________________
> > II> postgis-users mailing list
> > II> postgis-users at postgis.refractions.net
> > II> http://postgis.refractions.net/mailman/listinfo/postgis-users
> > 
> > 
> > 
> > -- 
> > Best regards,
> > -----------------------------------------------
> > Dorel Ionut Iordache - <ionut at eps.berkeley.edu>
> > UC Berkeley - Earth & Planetary Science Dept.
> > 
> > _______________________________________________
> > postgis-users mailing list
> > postgis-users at postgis.refractions.net
> > http://postgis.refractions.net/mailman/listinfo/postgis-users
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