gdb : Cannot access memory at address 0x99f825d4

johnpaulodonnell · 03-22-2007, 09:33 AM

Hi.

Trying to sort out a segmentation fault. The code is written in fortran 90 and compiles fine with intel fortran compiler ifort. The executable crashes at a certain point with a segmentation fault reported.

I've ran the executable with the linux debugger gdb and get the folowing output:

Code:

Program received signal SIGSEGV, Segmentation fault.
0x0809af62 in dsinv_. ()

(gdb) where
#0  0x0809af62 in dsinv_. ()
Cannot access memory at address 0x99f825d4

Does anyone know how I might go about finding what address 0x99f825d4 refers to??? Or how I might solve this problem? I'm lost...

Thanks.

wjevans_7d1@yahoo.co · 03-23-2007, 08:14 PM

I'm almost sure that there's nothing valid at that address, and that the actual address 0x99f825d4 is unimportant. The first thing to try, in my opinion, is to take a look at the FORTRAN statement which blows up there and see whether you're indexing into an array, and whether the array index points to somewhere outside your array, either with an index that's too high or an index that's too low.

Hope this helps in a small way.