Re: grdmath problems

My suggestion of using letters for grid names was only to eliminate the 
possibility that the problem could in a way lie on the guessing code 
that tells if an argument starting by a a number is in fact a file name 
(a string).

The fact that debug builds some times work well when the non-debug 
doesn't is an unfortunate and not so rare situation. Often it's due to 
non-initialized variables that are initialized to 0 on release builds 
but to some random number in debug mode. However, that does not seam to 
be case here.

Since the whole command is a bit long I wonder if this in not something 
related to the 'argv' pointer that is set by the compiler. This being 
true a shorter number of grdmath operations would not show the problem. 
On the other hand I'm curious to know if the issue still happens with 
GMT5 (a better workaround than -V). In my quick tests I was not able to 
make it happen.


Joaquim

> Joachim:
>
>
> I followed your advice:
> cd /usr/src/gmt-4.5.11
> export CFLAGS="-g -O0"
> sudo ./configure --enable-debug
> sudo make
>
> then I ran these again and still got the buffer overflow error:
>
> /usr/src/gmt-4.5.11/bin/grdmath -R0/10/0/10 -I1 X = 1.grd
> /usr/src/gmt-4.5.11/bin/grdmath -R0/10/0/10 -I1 X = 2.grd
> /usr/src/gmt-4.5.11/bin/grdmath 1.grd DUP DUP 10 LE 0.65 MUL EXCH DUP 
> DUP DUP 10 GT EXCH 20 LE MUL EXCH 10 SUB 10 DIV -0.05 MUL 0.65 ADD MUL 
> EXCH DUP DUP DUP 20 GT EXCH 30 LE MUL EXCH 20 SUB 10 DIV -0.07 MUL 
> 0.60 ADD MUL EXCH DUP DUP DUP 30 GT EXCH 40 LE MUL EXCH 30 SUB 10 DIV 
> -0.08 MUL 0.53 ADD MUL EXCH 40 GT 0.45 MUL ADD ADD ADD ADD 686 2.grd 
> DIV EXCH POW MUL = 3.grd
>
> The backtrace looks similar to before:
>
> osop@osop-displays2:~$ /usr/src/gmt-4.5.11/bin/grdmath 1.grd DUP DUP 
> 10 LE 0.65 MUL EXCH DUP DUP DUP 10 GT EXCH 20 LE MUL EXCH 10 SUB 10 
> DIV -0.05 MUL 0.65 ADD MUL EXCH DUP DUP DUP 20 GT EXCH 30 LE MUL EXCH 
> 20 SUB 10 DIV -0.07 MUL 0.60 ADD MUL EXCH DUP DUP DUP 30 GT EXCH 40 LE 
> MUL EXCH 30 SUB 10 DIV -0.08 MUL 0.53 ADD MUL EXCH 40 GT 0.45 MUL ADD 
> ADD ADD ADD 686 2.grd DIV EXCH POW MUL = 3.grd
> *** buffer overflow detected ***: /usr/src/gmt-4.5.11/bin/grdmath 
> terminated
> ======= Backtrace: =========
> /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x37)[0x7f2217ae5f47]
> /lib/x86_64-linux-gnu/libc.so.6(+0x109e40)[0x7f2217ae4e40]
> /lib/x86_64-linux-gnu/libc.so.6(+0x108d13)[0x7f2217ae3d13]
> /usr/src/gmt-4.5.11/bin/grdmath[0x41e286]
> /usr/src/gmt-4.5.11/bin/grdmath[0x40cd4a]
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7f22179fc76d]
> /usr/src/gmt-4.5.11/bin/grdmath[0x40f409]
> ======= Memory map: ========
> ...
> ...
>
>
> *Branden Christensen*
> The Seismo Guys Blog: http://www.osop.com.pa/blog/the-seismo-guys/
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