Source lines don't advance on x86-64

[Michal Ludvig]

Hi,
I'm having following problem on a x86-64 architecture:
1) I have a sourcefile tst.c:
int main()
{
   int i;
   i=0;
   return i;
}
2) I compiled it with a native gcc:
gcc -g -o tst tst.c
3) And am debugging with native gdb:
***********
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This GDB was configured as "x86_64-unknown-linux"...
(gdb) br main
Breakpoint 1 at 0x400440: file tst.c, line 2.
(gdb) r
Starting program: /tmp/tst

Breakpoint 1, main () at tst.c:2
2       int main()
(gdb) n
4       int main()
(gdb)
5       int main()
(gdb)
6       int main()
(gdb)
0x2a95691da8 in _dl_pagesize () from /lib64/libc.so.6
(gdb) ^D
***********

As you can see, the current line of source code doesn't correspond with 
what is actually been done. Where and how can I fix it?

Thanks in advance

Michal Ludvig
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