Is this a bug of gconf-dbus?

/**
* In Debian system, If I mark the function test1() in programm, then the gconf is normal. If I invoke test1(), gconf will cause error.
*/
/*
* The following program will cause failure to invoke gconf client API, You can run the following programm.
* The error is " DBUS erro".
* GConf Error: Configuration server couldn't be contacted: D-BUS error: Message has the same reply serial
* as a currently-outstanding existing method call
* GConf Error: Configuration server couldn't be contacted: D-BUS error: No reply within specified time
*
*
*/
#include "gconf/gconf-client.h"
#include "glib.h"
#include "sys/types.h"
#include "sys/time.h"
#include "unistd.h"
#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include "sys/wait.h"

pid_t pid, pid2;
void test1()
{
GConfClient* client_read;
char temp_key[100];
char *text;
int i;

client_read = gconf_client_get_default();

for(i = 0; i <= 10; i++)
{
sprintf(temp_key, "/test/test%04d/key%04d", 3, i);
text = gconf_client_get_string(client_read, temp_key, NULL);
if(text)g_free(text);

}
g_object_unref (G_OBJECT (client_read));
}

void test_subproc1(void)
{
pid = fork();
if(pid == 0)
{
GConfClient* client_set;
char temp_key[100];
int i;
gboolean ret;

client_set = gconf_client_get_default();

for(i = 0; i <= 1000; i++)
{
sprintf(temp_key, "/test/test%04d/key%04d", 4, i);
ret = gconf_client_set_string(client_set, temp_key, "test ok", NULL);

}
g_object_unref (G_OBJECT (client_set));
exit(0);
}
}

void test_subproc2(void)
{
pid = fork();
if(pid == 0)
{
GConfClient* client_set;
char temp_key[100];
gboolean ret;
int i;

client_set = gconf_client_get_default();

for(i = 0; i <= 1000; i++)
{
sprintf(temp_key, "/test/test%04d/key%04d", 5, i);
ret = gconf_client_set_string(client_set, temp_key, "test ok", NULL);

}
g_object_unref (G_OBJECT (client_set));
exit(0);
}
}

int main()
{
int status;
g_type_init();

test_subproc1();
test_subproc2();
waitpid(pid, &status, 0);
waitpid(pid2, &status, 0);

test1(); // Invoking test1() will affect the gconf usage

test_subproc1();
test_subproc2();
waitpid(pid, &status, 0);
waitpid(pid2, &status, 0);

}