After upgrade to new QQ kernel(3.4) can not mount the samba server with mount option "credentials=/path/smbpass".
it work, if not use "credentials=/path/smbpass"

uname -a: Linux vm108 3.4.0-1-virtual #3-Ubuntu SMP Wed May 2 18:14:04 UTC 2012 i686 i686 i686 GNU/Linux

dpkg -l |grep smbfs
ii smbfs 2:5.1-1ubuntu1