Comment 2 for bug 1279024

StacktraceTop:
 __GI___nss_lookup_function (ni=0xb780fb58, fct_name=fct_name@entry=0xb760c584 "getgrnam_r") at nsswitch.c:468
 __GI___nss_lookup (ni=ni@entry=0xbfd924b8, fct_name=0xb760c584 "getgrnam_r", fct2_name=0x0, fctp=fctp@entry=0xbfd924bc) at nsswitch.c:229
 __GI___nss_group_lookup2 (ni=ni@entry=0xbfd924b8, fct_name=fct_name@entry=0xb760c584 "getgrnam_r", fct2_name=fct2_name@entry=0x0, fctp=fctp@entry=0xbfd924bc) at XXX-lookup.c:75
 __getgrnam_r (name=name@entry=0xb760bc93 "tty", resbuf=resbuf@entry=0xbfd92920, buffer=buffer@entry=0xbfd92500 "", buflen=1024, result=result@entry=0xbfd9291c) at ../nss/getXXbyYY_r.c:205
 grantpt (fd=34) at ../sysdeps/unix/grantpt.c:152