Gdb, точки наблюдения, mpi-программа

(gdb) set can-use-hw-watchpoints 0

Watchpoint number deleted because the program has left the block in which its expression is valid.
0xb7fec28b in _dl_fixup (l=0xb7fff918, reloc_arg=(optimized out))
    at dl-runtime.c:119
119 dl-runtime.c: Нет такого файла

set can-use-hw-watchpoints 0

(gdb) b _dl_fixup
Function "_dl_fixup" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y

Breakpoint 1 (_dl_fixup) pending.
(gdb) b main
Breakpoint 2 at 0x80483bd: file fix.c, line 5.
(gdb) run
Starting program: /tmp/fix 

Breakpoint 1, _dl_fixup (l=0x6048f8, reloc_arg=8) at dl-runtime.c:76
76	  const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]);
(gdb) bt
#0  _dl_fixup (l=0x6048f8, reloc_arg=8) at dl-runtime.c:76
#1  0x005f99f0 in _dl_runtime_resolve () at ../sysdeps/i386/dl-trampoline.S:37
#2  0x08048321 in _start ()
(gdb) info shared
From        To          Syms Read   Shared Object Library
0x005e5830  0x005fd0bf  Yes         /lib/ld-linux.so.2
0x0061daa0  0x0073c1f4  Yes         /lib/libc.so.6

#include <stdio.h>
#include "mpi.h"

int main(int argc, char* argv[])
{
	int size = -1;
	int rank = -1;
	
	MPI_Init(&argc,&argv);

	MPI_Comm_rank(MPI_COMM_WORLD, &rank);
	MPI_Comm_size(MPI_COMM_WORLD, &size);

	printf("%d from %d\n", rank, size);
	
	MPI_Finalize();
	return 0;
}

GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /home/anton/mpich2/programs/test...done.
(gdb) b main
Breakpoint 1 at 0x804859d: file ./test.cpp, line 6.
(gdb) r
Starting program: /home/anton/mpich2/programs/test 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".

Breakpoint 1, main (argc=1, argv=0xbffff1f4) at ./test.cpp:6
6		int size = -1;
(gdb) set can-use-hw-watchpoints 0 
(gdb) wa rank
Watchpoint 2: rank
(gdb) n
7		int rank = -1;
(gdb) n
Watchpoint 2: rank

Old value = -1210269708
New value = -1
main (argc=1, argv=0xbffff1f4) at ./test.cpp:9
9		MPI_Init(&argc,&argv);
(gdb) n 
Watchpoint 2 deleted because the program has left the block in
which its expression is valid.
0xb7fec28b in _dl_fixup (l=0xb7fff918, reloc_arg=<optimized out>)
    at dl-runtime.c:119
(gdb) 

GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /home/anton/mpich2/programs/test...done.
(gdb) set can-use-hw-watchpoints 0 
(gdb) b main
Breakpoint 1 at 0x804859d: file ./test.cpp, line 6.
(gdb) r
Starting program: /home/anton/mpich2/programs/test 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".

Breakpoint 1, main (argc=1, argv=0xbffff1f4) at ./test.cpp:6
6		int size = -1;
(gdb) p &size
$1 = (int *) 0xbffff148
(gdb) wa *((int *) 0xbffff148)
Watchpoint 2: *((int *) 0xbffff148)
(gdb) n
Watchpoint 2: *((int *) 0xbffff148)

Old value = 134514201
New value = -1
main (argc=1, argv=0xbffff1f4) at ./test.cpp:7
7		int rank = -1;
(gdb) n
9		MPI_Init(&argc,&argv);
(gdb) n
^C
Program received signal SIGINT, Interrupt.
0xb7fedddb in _dl_name_match_p (name=0xb7dfd3d9 "libpthread.so.0", map=0xb7fdc850) at dl-misc.c:306
306     dl-misc.c: Нет такого файла или каталога.