[GRASS-user] Attempt to export (r.out.gdal) produces sometimes an error and sometimes not

[Nikos Alexandris]

On Tue, 2008-09-23 at 19:55 +0100, Glynn Clements wrote:
> Nikos Alexandris wrote:
> 
> > 1st attempt to export:
> >  > r.out.gdal in=composite_b123 out=/home/nik/grassdb/peloponnese/data/exports/composite_b123.tif
> > Exporting to GDAL data type: UInt16
> > Segmentation fault
> 
> > Shouldn't the same error message (from the 1st attempt) remain?
> 
> It appears that there is a memory corruption bug somewhere, either in
> r.out.gdal, the GRASS libraries, the GDAL library, or a library which
> it uses.
> 
> The consequences of a memory corruption bug often depend upon the
> exact memory layout, or even the exact contents of uninitialised
> memory. Sometimes it will cause problems, sometimes it won't.
> 
> It doesn't help that such bugs often fail to manifest if the program
> is run under a debugger (colloquially referred to as a "Heisenbug", in
> reference to the quantum mechanics principle that simply observing a
> system can change its behaviour).

The funny is that the different results replace each other after each
attempt (I think I tried more than 6 times). One error and one success,
one error and one success...