Parent segfault:

(gdb) bt
#0  0xffffe410 in ?? ()
#1  0xbfffec78 in ?? ()
#2  0x00000000 in ?? ()
#3  0xbfffeb34 in ?? ()
#4  0x402e1513 in __waitpid_nocancel () from /lib/tls/libc.so.6
#5  0x4028e71c in do_system () from /lib/tls/libc.so.6
#6  0x081029be in smb_panic (why=0x822c784 "smb_xmalloc_array: malloc fail.\n") at lib/util.c:1638
#7  0x08104340 in smb_xmalloc_array (size=1, count=0) at lib/util.c:2457
#8  0x08104368 in smb_xmemdup (p=0x0, size=0) at lib/util.c:2469
#9  0x08088a61 in getgroups_sid2gid_recv (private_data=0x82db008, success=0, gid=0) at nsswitch/winbindd_group.c:1401
#10 0x080a9408 in winbindd_sid2gid_recv (mem_ctx=0x82989b0, success=0, response=0x8307730, c=0x80889b1,
    private_data=0x82db008) at nsswitch/winbindd_async.c:532
#11 0x080a83d5 in do_async_recv (private_data=0x8306f08, success=0) at nsswitch/winbindd_async.c:57
#12 0x080a66cd in async_reply_recv (private_data=0x82da050, success=0) at nsswitch/winbindd_dual.c:213
#13 0x080819be in rw_callback (event=0x826f330, flags=1) at nsswitch/winbindd.c:386
#14 0x08082633 in process_loop () at nsswitch/winbindd.c:832
#15 0x08082f7e in main (argc=1, argv=0xbffff4f4, envp=0xbffff4fc) at nsswitch/winbindd.c:1100
(gdb) frame 9
#9  0x08088a61 in getgroups_sid2gid_recv (private_data=0x82db008, success=0, gid=0) at nsswitch/winbindd_group.c:1401
1401            s->state->response.extra_data.data = smb_xmemdup(s->token_gids, s->num_token_gids * sizeof(gid_t));
(gdb) p *s
$1 = {state = 0x8300568, domain = 0x82db0c0, domname = 0x82c9570 "BLA", username = 0x82b1228 "win2", user_sid = {
    sid_rev_num = 1 '\001', num_auths = 5 '\005', id_auth = "\000\000\000\000\000\005", sub_auths = {21, 226633176,
      984874016, 714868511, 3000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, token_sids = 0x8281070, i = 2, num_token_sids = 2,
  token_gids = 0x0, num_token_gids = 0}
(gdb)