When I try to use the "unix passwd sync" feature in samba
2.0.4b, the passwd program just dies, after the samba
password change script has passed the news password to
passwd program. It doesnt occur in 5.2, and other people
also have the same problem. Here is a part of my samba log:

[1999/07/02 12:42:09, 3]
smbd/chgpasswd.c:chat_with_program(369)
  Dochild for user jaanus (uid=0,gid=0)
[1999/07/02 12:42:09, 10] smbd/chgpasswd.c:dochild(189)
  Invoking '/usr/bin/passwd jaanus' as password change
program.
[1999/07/02 12:42:10, 100] smbd/chgpasswd.c:talktochild(263)
  talktochild: chatbuf=[*password*] responsebuf=[Changing
password for
user jaanus
  New UNIX password: ]
[1999/07/02 12:42:10, 100] smbd/chgpasswd.c:talktochild(276)
  talktochild: sendbuf=[xxxxxxx
  ]
[1999/07/02 12:42:10, 100] smbd/chgpasswd.c:talktochild(263)
  talktochild: chatbuf=[*password*] responsebuf=[
  Retype new UNIX password: ]
[1999/07/02 12:42:10, 100] smbd/chgpasswd.c:talktochild(276)
  talktochild: sendbuf=[xxxxxxx
  ]
[1999/07/02 12:42:29, 3]
smbd/chgpasswd.c:chat_with_program(347)
  The process exited while we were waiting

Sorry, if this is samba bug, but i thought i'll report that.
You may never know... ;)