libc6 isn't returning a valid user in char *getlogin()

[Jayson Reis]

A simple c program in my machine demonstrate what is happening.

#include <unistd.h>
#include <stdio.h>

int main( int argc, char *argv[] ) {
    char *name;
    name = getlogin();
    if (name != NULL)
        printf("%s\n", name);
    else
        printf("name is null\n");
    return 0;
}

I'm just compiling and running it and name aways come as NULL;
Note that i'm not a C developer, i got this when my python tests broke with os.getlogin.

Thank you

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libc6 2.15-0ubuntu10
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic-pae 3.2.21
Uname: Linux 3.2.0-27-generic-pae i686
ApportVersion: 2.0.1-0ubuntu11
Architecture: i386
Date: Fri Aug 3 14:16:20 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: eglibc
UpgradeStatus: Upgraded to precise on 2012-07-02 (32 days ago)

[bcrowell (launchpadcrowell07)]

Probably the same as this bug: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1067779

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[bcrowell (launchpadcrowell07)]

---- rintintin ~ $ lsb_release -a
LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID: Ubuntu
Description: Ubuntu 12.04.1 LTS
Release: 12.04
Codename: precise
---- rintintin ~ $ cat >gl.c
#include <unistd.h>
#include <stdio.h>

int main(void) {
   puts(getlogin());
   return 0;
}
---- rintintin ~ $ gcc gl.c && ulimit -c unlimited && ./a.out
Segmentation fault (core dumped)

I'll attach the core dump.