[Samba] Can't get working nsswitch, specifically "wbinfo -u"

[Sigun Nesvarbus]

Hi,
my environment: Win2003 AD + Samba4 as second RW DC on debian wheeze.
Samba compiled from source: samba --version
Version 4.1.0pre1-GIT-c932b13

Installed Samba4 according these:
https://wiki.samba.org/index.php/Main_Page
https://wiki.samba.org/index.php/Samba4/HOWTO/Join_a_domain_as_a_DC
https://wiki.samba.org/index.php/Samba4/Winbind

Everything went good according tutorial, until I try get user list with 
wbinfo -u
After 4 to 5 minutes (yes, minutes, not seconds) it writes
Error looking up domain users

Interesting, what does not include listing all users, works:
wbinfo --user-info info
CENTRAS\info:*:3000017:100:Test User:/home/CENTRAS/info:/bin/false

wbinfo --user-groups info
list of group's id's

wbinfo --gid-info 3000040
pr_pletra  (AD group, where info user belongs)

wbinfo --pam-logon info
Enter info's password:
plaintext password authentication succeeded

id info
works to, I get all AD groups where user belongs

wbinfo -g works, I get AD groups.

I can access samba share, create/read files.

I attached excerpt from wbinfo -u strace. There are timeouts accessing 
/usr/local/samba/var/lib/winbindd_privileged
(socket exists and after samba restart is created again)

What's wrong with that? Where to search for a problem? I think I have 
similar problem with post <50EE8D9D.2000707 at lillimoth.com> from 
2013-01-10, only there were waiting time for a couple of seconds, mine 
are couple of minutes and I don't get user list.

May it be, because of more than 1000 AD users we have?

Sig.

-------------- next part --------------
15:19:55.446218 read(3, "/usr/local/samba/var/lib/winbind"..., 45) = 45 <0.000008>
15:19:55.446254 lstat("/usr/local/samba/var/lib/winbindd_privileged", {st_mode=S_IFDIR|S_ISGID|0750, st_size=4096, ...}) = 0 <0.000010>
15:19:55.446309 lstat("/usr/local/samba/var/lib/winbindd_privileged/pipe", {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0 <0.000009>
15:19:55.446361 socket(PF_FILE, SOCK_STREAM, 0) = 4 <0.000011>
15:19:55.446397 fcntl(4, F_GETFL)       = 0x2 (flags O_RDWR) <0.000005>
15:19:55.446427 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 <0.000006>
15:19:55.446457 fcntl(4, F_GETFD)       = 0 <0.000006>
15:19:55.446487 fcntl(4, F_SETFD, FD_CLOEXEC) = 0 <0.000006>
15:19:55.446516 connect(4, {sa_family=AF_FILE, path="/usr/local/samba/var/lib/winbindd_privileged/pipe"}, 110) = 0 <0.000097>
15:19:55.446655 close(3)                = 0 <0.000056>
15:19:55.446740 poll([{fd=4, events=POLLIN|POLLHUP}], 1, 0) = 0 (Timeout) <0.000007>
15:19:55.446776 write(4, "0\10\0\0\22\0\0\0\0\0\0\0gk\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2096) = 2096 <0.000120>
15:19:55.446951 poll([{fd=4, events=POLLIN|POLLHUP}], 1, 5000) = 0 (Timeout) <5.002095>
15:20:00.449121 poll([{fd=4, events=POLLIN|POLLHUP}], 1, 5000) = 0 (Timeout) <5.003899>
15:20:05.453109 poll([{fd=4, events=POLLIN|POLLHUP}], 1, 5000) = 0 (Timeout) <5.003930>
15:20:10.457128 poll([{fd=4, events=POLLIN|POLLHUP}], 1, 5000) = 0 (Timeout) <5.005036>
15:20:15.462254 poll([{fd=4, events=POLLIN|POLLHUP}], 1, 5000) = 0 (Timeout) <5.005045>
15:20:20.467382 poll([{fd=4, events=POLLIN|POLLHUP}], 1, 5000) = 0 (Timeout) <5.001633>
15:20:25.469099 poll([{fd=4, events=POLLIN|POLLHUP}], 1, 5000) = 0 (Timeout) <5.003915>
15:20:30.473105 close(4)                = 0 <0.000018>
15:20:30.473198 write(2, "Error looking up domain users\n", 30Error looking up domain users
) = 30 <0.000010>
15:20:30.473354 exit_group(1)           = ?